File 2821-Compiling-static-beam-lib-for-iOS.patch of Package erlang

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File 2821-Compiling-static-beam-lib-for-iOS.patch of Package erlang (Revision 834576b566c5d6a655bbc8998ea53173)

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From 4431bec6a7fcc005c0fdbf90e799f907b5e8f873 Mon Sep 17 00:00:00 2001
From: Dominic Letz <dominic@diode.io>
Date: Mon, 20 Sep 2021 16:47:05 +0200
Subject: [PATCH] Compiling static beam lib for iOS

---
 .github/workflows/main.yaml              |  37 ++++
 HOWTO/INSTALL-IOS.md                     | 120 ++++++++++
 erts/emulator/Makefile.in                |  39 +++-
 erts/emulator/beam/erl_nif.c             |  10 +
 erts/emulator/beam/io.c                  |   7 +-
 erts/etc/common/etc_common.h             |   7 +
 erts/etc/common/heart.c                  |  17 +-
 xcomp/erl-xcomp-arm-ios.conf             | 268 ++++++++++++++++++++++
 xcomp/erl-xcomp-arm64-ios.conf           | 269 +++++++++++++++++++++++
 xcomp/erl-xcomp-arm64-iossimulator.conf  | 269 +++++++++++++++++++++++
 xcomp/erl-xcomp-host-iossimulator.conf   | 268 ++++++++++++++++++++++
 xcomp/erl-xcomp-x86_64-iossimulator.conf | 269 +++++++++++++++++++++++
 12 files changed, 1558 insertions(+), 22 deletions(-)
 create mode 100644 HOWTO/INSTALL-IOS.md
 create mode 100644 xcomp/erl-xcomp-arm-ios.conf
 create mode 100644 xcomp/erl-xcomp-arm64-ios.conf
 create mode 100644 xcomp/erl-xcomp-arm64-iossimulator.conf
 create mode 100644 xcomp/erl-xcomp-host-iossimulator.conf
 create mode 100644 xcomp/erl-xcomp-x86_64-iossimulator.conf

diff --git a/HOWTO/INSTALL-IOS.md b/HOWTO/INSTALL-IOS.md
new file mode 100644
index 0000000000..cdb0bab137
--- /dev/null
+++ b/HOWTO/INSTALL-IOS.md
@@ -0,0 +1,120 @@
+Cross Compiling Erlang/OTP - IOS
+====================================
+
+Introduction
+------------
+
+This document describes how to cross compile Erlang/OTP to iOS platforms. iOS has the peculiarity that it does not support the creation of shared libraries. So the build process needs to be amended to generate statically linkable and executable Erlang binaries.
+
+### Get Xcode Tools ###
+
+iOS binaries can only be cross-compiled from Apple macOS computers. For compilation the Xcode tools must be used.
+### Environment Variables ###
+
+In order to inform the build system that it should generate the static linkable `libbeam.a` add the following environment variable during configuration and compilation:
+
+    $ export RELEASE_LIBBEAM=yes
+
+### Configure Erlang/OTP ###
+
+    To build without without OpenSSL support, run `configure` like this:
+    
+    $ ./otp_build configure \
+         --xcomp-conf=./xcomp/erl-xcomp-arm64-ios.conf  \
+         --without-ssl
+
+
+To build with OpenSSL statically linked, run `configure` like this (note that 1.1.1k works, but needs a manual patch in ios cross build config to include engines):
+
+    $ ./otp_build configure \
+         --xcomp-conf=./xcomp/erl-xcomp-arm64-ios.conf  \
+         --with-ssl=/path/to/libcrypto.a \
+         --disable-dynamic-ssl-lib
+
+
+### Compile Erlang/OTP ###
+
+    $ ./otp_build boot
+
+### Linking a binary with your App ###
+    
+To use the resulting `libbeam.a` it needs to be packaged into a Xcode `.xcframework` package together with all other required `.a` files. These include:
+
+* `libbeam.a`
+* `liberts.a`
+* `libz.a`
+* `libcrypto.a`
+
+Basically all .a files that have been generated by the build.
+
+One way of creating a combined archive out of all of these is to use `libtool`:
+
+    $ libtool -static -o liberlang.a /Path/to/libbeam.a /Path/to/liberts.a /Path/to/....a 
+
+This list should also include static nifs you want to include:
+
+Finally packaging the archive into a `.xcframework` directory:
+
+    $ xcodebuild -create-xcframework -output ./liberlang.xcframework -library liberlang.a
+
+If you're building for multiple iOS targets (e.g. simulator and phone):
+
+    $ xcodebuild -create-xcframework -output ./liberlang.xcframework -library /Path/to/phonelib/liberlang.a -library /Path/to/simulatorlib/liberlang.a
+
+## Starting Erlang
+
+To execute erlang from within an iOS project a native C/C++ wrapper is needed that can call the function:
+
+    erl_start(int argc, char *argv[]); 
+    
+An example call could look like this: 
+
+    $ const char *args[] = {
+            "my_main",
+            "-sbwt",
+            "none",
+            "--",
+            "-root",
+            root_dir.c_str(),
+            "-progname",
+            "erl",
+            "--",
+            "-home",
+            home_dir.c_str(),
+            "--",
+            "-kernel",
+            "shell_history",
+            "enabled",
+            "--",
+            "-start_epmd",
+            "false",
+            "-elixir",
+            "ansi_enabled",
+            "true",
+            "-noshell",
+            "-s",
+            "elixir",
+            "start_cli",
+            "-mode",
+            "interactive",
+            "-config",
+            config_path.c_str(),
+            "-boot",
+            boot_path.c_str(),
+            "-boot_var",
+            "RELEASE_LIB",
+            lib_path.c_str(),
+            "--",
+            "--",
+            "-extra",
+            "--no-halt",
+    };
+
+    erl_start(sizeof(args) / sizeof(args[0]), (char **)args);
+
+### Reference Example
+
+At the time of writing (October 2021) there is a full reference iOS application available at https://github.com/elixir-desktop/ios-example-app.
+
+An implementation of the native wrapper can be viewed at https://github.com/elixir-desktop/ios-example-app/blob/main/native-lib.cpp.
+
diff --git a/erts/emulator/Makefile.in b/erts/emulator/Makefile.in
index 59751066ac..d74b31f4eb 100644
--- a/erts/emulator/Makefile.in
+++ b/erts/emulator/Makefile.in
@@ -33,6 +33,7 @@ LIBS = @LIBS@
 Z_LIB=@Z_LIB@
 CROSS_COMPILING = @CROSS_COMPILING@
 NO_INLINE_FUNCTIONS=false
+USING_VC=@MIXED_VC@
 
 OPCODE_TABLES = \
     $(ERL_TOP)/lib/compiler/src/genop.tab \
@@ -202,8 +203,10 @@ space+=
 STATIC_NIFS=@STATIC_NIFS@
 ifneq ($(STATIC_NIFS),no)
 ifeq ($(STATIC_NIFS),yes)
-STATIC_NIFS=$(ERL_TOP)/lib/asn1/priv/lib/$(TARGET)/asn1rt_nif.a \
-	$(ERL_TOP)/lib/crypto/priv/lib/$(TARGET)/crypto$(TYPEMARKER).a
+STATIC_NIFS=$(ERL_TOP)/lib/asn1/priv/lib/$(TARGET)/asn1rt_nif.a
+ifeq ($(wildcard $(ERL_TOP)/lib/crypto/SKIP),)
+	STATIC_NIFS+=$(ERL_TOP)/lib/crypto/priv/lib/$(TARGET)/crypto$(TYPEMARKER).a
+endif
 endif
 STATIC_NIFS:=$(subst $(comma),$(space),$(STATIC_NIFS))
 endif
@@ -218,7 +221,7 @@ endif
 
 
 #
-# NOTE: When adding a new type update ERL_BUILD_TYPE_MARKER in sys/unix/sys.c
+# NOTE: When adding a new type update ERL_BUILD_TYPE_MARKER in sys/unix/sys_drivers.c
 #
 
 FLAVOR_MARKER=.$(FLAVOR)
@@ -436,8 +439,10 @@ ENABLE_ALLOC_TYPE_VARS += @ERLANG_OSTYPE@
 
 ifeq ($(TARGET), win32)
 FLAVOR_EXECUTABLE = beam$(TF_MARKER).dll
+EMULATOR_LIB = libbeam.lib
 else
 FLAVOR_EXECUTABLE = beam$(TF_MARKER)
+EMULATOR_LIB = libbeam.a
 PROFILE_EXECUTABLE = beam.prof$(TF_MARKER)
 endif
 CS_EXECUTABLE = erl_child_setup$(TYPEMARKER)
@@ -476,7 +481,7 @@ ifdef VOID_EMULATOR
 all:
 	@echo $(VOID_EMULATOR)' - omitted target all'
 else
-all: $(BINDIR)/$(EMULATOR_EXECUTABLE) $(UNIX_ONLY_BUILDS)
+all: $(BINDIR)/$(EMULATOR_EXECUTABLE) $(BINDIR)/$(EMULATOR_LIB) $(UNIX_ONLY_BUILDS)
 endif
 
 $(BINDIR)/$(PRIMARY_EXECUTABLE): $(BINDIR)/$(FLAVOR_EXECUTABLE)
@@ -533,6 +538,10 @@ release_spec: all
 	$(INSTALL_DATA) $(RELEASE_INCLUDES) "$(RELEASE_PATH)/usr/include"
 	$(INSTALL_DATA) $(RELEASE_INCLUDES) "$(RELSYSDIR)/include"
 	$(INSTALL_PROGRAM) $(BINDIR)/$(EMULATOR_EXECUTABLE) "$(RELSYSDIR)/bin"
+ifeq ($(RELEASE_LIBBEAM),yes)
+	$(INSTALL_DIR) "$(RELSYSDIR)/lib"
+	$(INSTALL_PROGRAM) $(BINDIR)/$(EMULATOR_LIB) "$(RELSYSDIR)/lib"
+endif
 ifeq ($(ERLANG_OSTYPE), unix)
 	$(INSTALL_PROGRAM) $(BINDIR)/$(CS_EXECUTABLE) "$(RELSYSDIR)/bin"
 endif
@@ -1275,6 +1284,26 @@ $(BINDIR)/$(FLAVOR_EXECUTABLE): $(INIT_OBJS) $(OBJS) $(DEPLIBS)
 
 endif
 
+# ----------------------------------------------------------------------
+# The emulator as a static lib ...
+#
+ifeq ($(USING_VC),yes)
+AR_OUT=-out:
+AR_FLAGS=
+else
+AR_OUT=
+ifeq ($(V),0)
+AR_FLAGS=rc
+else
+AR_FLAGS=rcv
+endif
+endif
+
+$(BINDIR)/${EMULATOR_LIB}: $(PRELOAD_OBJ) $(OBJS) $(DEPLIBS)
+	$(V_AR) $(AR_FLAGS) $(AR_OUT)$@ \
+	$(PRELOAD_OBJ) $(OBJS)
+	$(V_RANLIB) $@
+
 # ----------------------------------------------------------------------
 # Dependencies
 #
@@ -1342,7 +1371,7 @@ DEP_FLAGS=-MM  $(subst -O2,,$(CFLAGS)) $(INCLUDES) -I../etc/win32 \
 	-Idrivers/common -Idrivers/$(ERLANG_OSTYPE) \
 	-Inifs/common -Inifs/$(ERLANG_OSTYPE)
 
-# ifeq (@MIXED_VC@,yes)
+# ifeq ($(USING_VC),yes)
 # VC++ used for compiling. If __GNUC__ is defined we will include
 # other headers then when compiling which will result in faulty
 # dependencies.
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index 50099454f7..9dd484202f 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -4439,6 +4439,16 @@ Eterm erts_load_nif(Process *c_p, ErtsCodePtr I, Eterm filename, Eterm args)
     {
         ErtsStaticNifEntry* sne;
         sne = erts_static_nif_get_nif_init((char*)mod_atomp->name, mod_atomp->len);
+        if (sne == NULL) {
+            /* Second lookup in the static nif table based on the filename */
+            /* this allows Elixir modules which always have dots '.' in their */
+            /* module names to be loaded */
+            char *basename = strrchr(lib_name, '/');
+            if (basename) {
+                basename++;
+                sne = erts_static_nif_get_nif_init(basename, strlen(basename));
+            }
+        }        
         if (sne != NULL) {
             init_func = sne->nif_init;
             handle = init_func;
diff --git a/erts/emulator/beam/io.c b/erts/emulator/beam/io.c
index a11f042e10..71051ccd6d 100644
--- a/erts/emulator/beam/io.c
+++ b/erts/emulator/beam/io.c
@@ -570,7 +570,12 @@ erts_open_driver(erts_driver_t* driver,	/* Pointer to driver. */
 	if (!(opts->spawn_type & ERTS_SPAWN_EXECUTABLE)) {
 	    /* No spawn driver default */
 	    driver = NULL;
-	}
+	} else {
+#ifdef __IOS__ 
+	    erts_rwmtx_runlock(&erts_driver_list_lock);
+	    ERTS_OPEN_DRIVER_RET(NULL, -3, BADARG);	   
+#endif
+    }
 
 
 	if (opts->spawn_type != ERTS_SPAWN_EXECUTABLE) {
diff --git a/erts/etc/common/etc_common.h b/erts/etc/common/etc_common.h
index 7561630945..93036db200 100644
--- a/erts/etc/common/etc_common.h
+++ b/erts/etc/common/etc_common.h
@@ -64,6 +64,13 @@
 #define snprintf _snprintf
 #endif
 
+#ifdef __IOS__
+#ifdef system
+#undef system
+#endif 
+#define system(X) 0
+#endif
+
 #ifdef DEBUG
 #  define ASSERT(Cnd) ((void)((Cnd) ? 1 : abort()))
 #else
diff --git a/erts/etc/common/heart.c b/erts/etc/common/heart.c
index 404b5fa52e..b718a125dc 100644
--- a/erts/etc/common/heart.c
+++ b/erts/etc/common/heart.c
@@ -74,16 +74,7 @@
  *
  */
 
-#ifdef HAVE_CONFIG_H
-#  include "config.h"
-#endif
-
-#ifdef __WIN32__
-#include <windows.h>
-#include <io.h>
-#include <fcntl.h>
-#include <process.h>
-#endif
+#include "etc_common.h"
 
 /*
  * Implement time correction using times() call even on Linuxes 
@@ -91,13 +82,7 @@
  * a phony gethrtime in this file as the time questions are so infrequent.
  */
 
-#include <stdio.h>
 #include <stddef.h>
-#include <stdlib.h>
-
-#include <stdarg.h>
-
-#include <string.h>
 #include <time.h>
 #include <errno.h>
 
diff --git a/xcomp/erl-xcomp-arm-ios.conf b/xcomp/erl-xcomp-arm-ios.conf
new file mode 100644
index 0000000000..534c0c07b5
--- /dev/null
+++ b/xcomp/erl-xcomp-arm-ios.conf
@@ -0,0 +1,268 @@
+## -*-shell-script-*-
+##
+## %CopyrightBegin%
+##
+## Copyright Ericsson AB 2009-2019. All Rights Reserved.
+##
+## Licensed under the Apache License, Version 2.0 (the "License");
+## you may not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+##     http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+## %CopyrightEnd%
+##
+## File: erl-xcomp-arm-ios.conf
+## Author: Dominic Letz
+##
+## -----------------------------------------------------------------------------
+## When cross compiling Erlang/OTP using `otp_build', copy this file and set
+## the variables needed below. Then pass the path to the copy of this file as
+## an argument to `otp_build' in the configure stage:
+##   `otp_build configure --xcomp-conf=<FILE>'
+## -----------------------------------------------------------------------------
+
+## Note that you cannot define arbitrary variables in a cross compilation
+## configuration file. Only the ones listed below will be guaranteed to be
+## visible throughout the whole execution of all `configure' scripts. Other
+## variables needs to be defined as arguments to `configure' or exported in
+## the environment.
+
+## -- Variables for `otp_build' Only -------------------------------------------
+
+## Variables in this section are only used, when configuring Erlang/OTP for
+## cross compilation using `$ERL_TOP/otp_build configure'.
+
+## *NOTE*! These variables currently have *no* effect if you configure using
+## the `configure' script directly.
+
+# * `erl_xcomp_build' - The build system used. This value will be passed as
+#   `--build=$erl_xcomp_build' argument to the `configure' script. It does
+#   not have to be a full `CPU-VENDOR-OS' triplet, but can be. The full
+#   `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_build'. If set to `guess',
+#   the build system will be guessed using
+#   `$ERL_TOP/erts/autoconf/config.guess'.
+erl_xcomp_build=guess
+
+# * `erl_xcomp_host' - Cross host/target system to build for. This value will
+#   be passed as `--host=$erl_xcomp_host' argument to the `configure' script.
+#   It does not have to be a full `CPU-VENDOR-OS' triplet, but can be. The
+#   full `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_host'.
+erl_xcomp_host=arm-apple-ios
+
+# * `erl_xcomp_configure_flags' - Extra configure flags to pass to the
+#   `configure' script.
+erl_xcomp_configure_flags="--without-termcap --without-wx \
+    --without-javac --without-odbc \
+    --without-debugger --without-observer --without-cdv --without-et \
+    --enable-builtin-zlib --enable-static-nifs --enable-static-drivers"
+
+
+## -- Cross Compiler and Other Tools -------------------------------------------
+
+## If the cross compilation tools are prefixed by `<HOST>-' you probably do
+## not need to set these variables (where `<HOST>' is what has been passed as
+## `--host=<HOST>' argument to `configure').
+
+## All variables in this section can also be used when native compiling.
+
+export XCOMP_SDK=iphoneos
+export XCOMP_SDKROOT=`xcrun -sdk $XCOMP_SDK --show-sdk-path`
+export XCOMP_ARCH="-arch armv7"
+
+# * `CC' - C compiler.
+CC="xcrun -sdk $XCOMP_SDK cc $XCOMP_ARCH"
+
+# * `CFLAGS' - C compiler flags.
+CFLAGS="-mios-version-min=7.0.0 -fno-common -Os -D__IOS__=yes"
+
+# * `STATIC_CFLAGS' - Static C compiler flags.
+#STATIC_CFLAGS=
+
+# * `CFLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for the shared libraries. Note that this actually is a
+#   linker flag, but it needs to be passed via the compiler.
+#CFLAG_RUNTIME_LIBRARY_PATH=
+
+# * `CPP' - C pre-processor.
+#CPP=
+
+# * `CPPFLAGS' - C pre-processor flags.
+#CPPFLAGS=
+
+# * `CXX' - C++ compiler.
+CXX="xcrun -sdk $XCOMP_SDK c++ $XCOMP_ARCH"
+
+# * `CXXFLAGS' - C++ compiler flags.
+CXXFLAGS=$CFLAGS
+
+# * `LD' - Linker.
+LD="xcrun -sdk $XCOMP_SDK ld $XCOMP_ARCH"
+
+# * `LDFLAGS' - Linker flags.
+LDFLAGS="-L$XCOMP_SDKROOT/usr/lib/ -lc++ -v"
+
+# * `LIBS' - Libraries.
+#LIBS=
+
+## -- *D*ynamic *E*rlang *D*river Linking --
+
+## *NOTE*! Either set all or none of the `DED_LD*' variables.
+
+# * `DED_LD' - Linker for Dynamically loaded Erlang Drivers.
+DED_LD=$LD
+
+# * `DED_LDFLAGS' - Linker flags to use with `DED_LD'.
+DED_LDFLAGS="-L$XCOMP_SDKROOT/usr/lib/ -r -v"
+
+# * `DED_LD_FLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for shared libraries when linking with `DED_LD'.
+#DED_LD_FLAG_RUNTIME_LIBRARY_PATH=
+
+## -- Large File Support --
+
+## *NOTE*! Either set all or none of the `LFS_*' variables.
+
+# * `LFS_CFLAGS' - Large file support C compiler flags.
+#LFS_CFLAGS=
+
+# * `LFS_LDFLAGS' - Large file support linker flags.
+#LFS_LDFLAGS=
+
+# * `LFS_LIBS' - Large file support libraries.
+#LFS_LIBS=
+
+## -- Other Tools --
+
+# * `RANLIB' - `ranlib' archive index tool.
+RANLIB="xcrun -sdk $XCOMP_SDK ranlib"
+
+# * `AR' - `ar' archiving tool.
+AR="xcrun -sdk $XCOMP_SDK ar"
+
+# * `GETCONF' - `getconf' system configuration inspection tool. `getconf' is
+#   currently used for finding out large file support flags to use, and
+#   on Linux systems for finding out if we have an NPTL thread library or
+#   not.
+#GETCONF=
+
+## -- Cross System Root Locations ----------------------------------------------
+
+# * `erl_xcomp_sysroot' - The absolute path to the system root of the cross
+#   compilation environment. Currently, the `crypto', `odbc', `ssh' and
+#   `ssl' applications need the system root. These applications will be
+#   skipped if the system root has not been set. The system root might be
+#   needed for other things too. If this is the case and the system root
+#   has not been set, `configure' will fail and request you to set it.
+erl_xcomp_sysroot=$XCOMP_SDKROOT
+
+
+# * `erl_xcomp_isysroot' - The absolute path to the system root for includes
+#   of the cross compilation environment. If not set, this value defaults
+#   to `$erl_xcomp_sysroot', i.e., only set this value if the include system
+#   root path is not the same as the system root path.
+#erl_xcomp_isysroot=
+
+## -- Optional Feature, and Bug Tests ------------------------------------------
+
+## These tests cannot (always) be done automatically when cross compiling. You
+## usually do not need to set these variables. Only set these if you really
+## know what you are doing.
+
+## Note that some of these values will override results of tests performed
+## by `configure', and some will not be used until `configure' is sure that
+## it cannot figure the result out.
+
+## The `configure' script will issue a warning when a default value is used.
+## When a variable has been set, no warning will be issued.
+
+# * `erl_xcomp_after_morecore_hook' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `__after_morecore_hook' that can be
+#   used for tracking used `malloc()' implementations core memory usage.
+#   This is currently only used by unsupported features.
+#erl_xcomp_after_morecore_hook=
+
+# * `erl_xcomp_bigendian' - `yes|no'. No default. If `yes', the target system
+#   must be big endian. If `no', little endian. This can often be
+#   automatically detected, but not always. If not automatically detected,
+#   `configure' will fail unless this variable is set. Since no default
+#   value is used, `configure' will try to figure this out automatically.
+#erl_xcomp_bigendian=
+
+# * `erl_xcomp_clock_gettime_cpu_time' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `clock_gettime()' implementation
+#   that can be used for retrieving process CPU time.
+#erl_xcomp_clock_gettime_cpu_time=
+
+# * `erl_xcomp_getaddrinfo' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `getaddrinfo()' implementation that can
+#   handle both IPv4 and IPv6.
+#erl_xcomp_getaddrinfo=
+
+# * `erl_xcomp_gethrvtime_procfs_ioctl' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `gethrvtime()' implementation and
+#   is used with procfs `ioctl()'.
+#erl_xcomp_gethrvtime_procfs_ioctl=
+
+# * `erl_xcomp_dlsym_brk_wrappers' - `yes|no'. Defaults to `no'. If `yes', the
+#   target system must have a working `dlsym(RTLD_NEXT, <S>)' implementation
+#   that can be used on `brk' and `sbrk' symbols used by the `malloc()'
+#   implementation in use, and by this track the `malloc()' implementations
+#   core memory usage. This is currently only used by unsupported features.
+#erl_xcomp_dlsym_brk_wrappers=
+
+# * `erl_xcomp_kqueue' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `kqueue()' implementation that returns a file
+#   descriptor which can be used by `poll()' and/or `select()'. If `no' and
+#   the target system has not got `epoll()' or `/dev/poll', the kernel-poll
+#   feature will be disabled.
+#erl_xcomp_kqueue=
+
+# * `erl_xcomp_linux_clock_gettime_correction' - `yes|no'. Defaults to `yes' on
+#   Linux; otherwise, `no'. If `yes', `clock_gettime(CLOCK_MONOTONIC, _)' on
+#   the target system must work. This variable is recommended to be set to
+#   `no' on Linux systems with kernel versions less than 2.6.
+#erl_xcomp_linux_clock_gettime_correction=
+
+# * `erl_xcomp_linux_nptl' - `yes|no'. Defaults to `yes' on Linux; otherwise,
+#   `no'. If `yes', the target system must have NPTL (Native POSIX Thread
+#   Library). Older Linux systems have LinuxThreads instead of NPTL (Linux
+#   kernel versions typically less than 2.6).
+#erl_xcomp_linux_nptl=
+
+# * `erl_xcomp_linux_usable_sigaltstack' - `yes|no'. Defaults to `yes' on Linux;
+#   otherwise, `no'. If `yes', `sigaltstack()' must be usable on the target
+#   system. `sigaltstack()' on Linux kernel versions less than 2.4 are
+#   broken.
+#erl_xcomp_linux_usable_sigaltstack=
+
+# * `erl_xcomp_linux_usable_sigusrx' - `yes|no'. Defaults to `yes'. If `yes',
+#   the `SIGUSR1' and `SIGUSR2' signals must be usable by the ERTS. Old
+#   LinuxThreads thread libraries (Linux kernel versions typically less than
+#   2.2) used these signals and made them unusable by the ERTS.
+#erl_xcomp_linux_usable_sigusrx=
+
+# * `erl_xcomp_poll' - `yes|no'. Defaults to `no' on Darwin/MacOSX; otherwise,
+#   `yes'. If `yes', the target system must have a working `poll()'
+#   implementation that also can handle devices. If `no', `select()' will be
+#   used instead of `poll()'.
+#erl_xcomp_poll=
+
+# * `erl_xcomp_putenv_copy' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a `putenv()' implementation that stores a copy of the
+#   key/value pair.
+#erl_xcomp_putenv_copy=
+
+# * `erl_xcomp_reliable_fpe' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have reliable floating point exceptions.
+#erl_xcomp_reliable_fpe=
+
+## -----------------------------------------------------------------------------
diff --git a/xcomp/erl-xcomp-arm64-ios.conf b/xcomp/erl-xcomp-arm64-ios.conf
new file mode 100644
index 0000000000..0e5d7fa788
--- /dev/null
+++ b/xcomp/erl-xcomp-arm64-ios.conf
@@ -0,0 +1,269 @@
+## -*-shell-script-*-
+##
+## %CopyrightBegin%
+##
+## Copyright Ericsson AB 2009-2019. All Rights Reserved.
+##
+## Licensed under the Apache License, Version 2.0 (the "License");
+## you may not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+##     http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+## %CopyrightEnd%
+##
+## File: erl-xcomp-arm64-ios.conf
+## Author: Dominic Letz
+##
+## -----------------------------------------------------------------------------
+## When cross compiling Erlang/OTP using `otp_build', copy this file and set
+## the variables needed below. Then pass the path to the copy of this file as
+## an argument to `otp_build' in the configure stage:
+##   `otp_build configure --xcomp-conf=<FILE>'
+## -----------------------------------------------------------------------------
+
+## Note that you cannot define arbitrary variables in a cross compilation
+## configuration file. Only the ones listed below will be guaranteed to be
+## visible throughout the whole execution of all `configure' scripts. Other
+## variables needs to be defined as arguments to `configure' or exported in
+## the environment.
+
+## -- Variables for `otp_build' Only -------------------------------------------
+
+## Variables in this section are only used, when configuring Erlang/OTP for
+## cross compilation using `$ERL_TOP/otp_build configure'.
+
+## *NOTE*! These variables currently have *no* effect if you configure using
+## the `configure' script directly.
+
+# * `erl_xcomp_build' - The build system used. This value will be passed as
+#   `--build=$erl_xcomp_build' argument to the `configure' script. It does
+#   not have to be a full `CPU-VENDOR-OS' triplet, but can be. The full
+#   `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_build'. If set to `guess',
+#   the build system will be guessed using
+#   `$ERL_TOP/erts/autoconf/config.guess'.
+erl_xcomp_build=guess
+
+# * `erl_xcomp_host' - Cross host/target system to build for. This value will
+#   be passed as `--host=$erl_xcomp_host' argument to the `configure' script.
+#   It does not have to be a full `CPU-VENDOR-OS' triplet, but can be. The
+#   full `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_host'.
+erl_xcomp_host=arm64-apple-ios
+
+# * `erl_xcomp_configure_flags' - Extra configure flags to pass to the
+#   `configure' script.
+erl_xcomp_configure_flags="--without-termcap --without-wx \
+    --without-javac --without-odbc \
+    --without-debugger --without-observer --without-cdv --without-et \
+    --enable-builtin-zlib --enable-static-nifs --enable-static-drivers \
+    --disable-jit"
+
+
+## -- Cross Compiler and Other Tools -------------------------------------------
+
+## If the cross compilation tools are prefixed by `<HOST>-' you probably do
+## not need to set these variables (where `<HOST>' is what has been passed as
+## `--host=<HOST>' argument to `configure').
+
+## All variables in this section can also be used when native compiling.
+
+export XCOMP_SDK=iphoneos
+export XCOMP_SDKROOT=`xcrun -sdk $XCOMP_SDK --show-sdk-path`
+export XCOMP_ARCH="-arch arm64"
+
+# * `CC' - C compiler.
+CC="xcrun -sdk $XCOMP_SDK cc $XCOMP_ARCH"
+
+# * `CFLAGS' - C compiler flags.
+CFLAGS="-mios-version-min=7.0.0 -fno-common -Os -D__IOS__=yes"
+
+# * `STATIC_CFLAGS' - Static C compiler flags.
+#STATIC_CFLAGS=
+
+# * `CFLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for the shared libraries. Note that this actually is a
+#   linker flag, but it needs to be passed via the compiler.
+#CFLAG_RUNTIME_LIBRARY_PATH=
+
+# * `CPP' - C pre-processor.
+#CPP=
+
+# * `CPPFLAGS' - C pre-processor flags.
+#CPPFLAGS=
+
+# * `CXX' - C++ compiler.
+CXX="xcrun -sdk $XCOMP_SDK c++ $XCOMP_ARCH"
+
+# * `CXXFLAGS' - C++ compiler flags.
+CXXFLAGS=$CFLAGS
+
+# * `LD' - Linker.
+LD="xcrun -sdk $XCOMP_SDK ld $XCOMP_ARCH"
+
+# * `LDFLAGS' - Linker flags.
+LDFLAGS="-L$XCOMP_SDKROOT/usr/lib/ -lc++ -v"
+
+# * `LIBS' - Libraries.
+#LIBS=
+
+## -- *D*ynamic *E*rlang *D*river Linking --
+
+## *NOTE*! Either set all or none of the `DED_LD*' variables.
+
+# * `DED_LD' - Linker for Dynamically loaded Erlang Drivers.
+DED_LD=$LD
+
+# * `DED_LDFLAGS' - Linker flags to use with `DED_LD'.
+DED_LDFLAGS="-L$XCOMP_SDKROOT/usr/lib/ -r -v"
+
+# * `DED_LD_FLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for shared libraries when linking with `DED_LD'.
+#DED_LD_FLAG_RUNTIME_LIBRARY_PATH=
+
+## -- Large File Support --
+
+## *NOTE*! Either set all or none of the `LFS_*' variables.
+
+# * `LFS_CFLAGS' - Large file support C compiler flags.
+#LFS_CFLAGS=
+
+# * `LFS_LDFLAGS' - Large file support linker flags.
+#LFS_LDFLAGS=
+
+# * `LFS_LIBS' - Large file support libraries.
+#LFS_LIBS=
+
+## -- Other Tools --
+
+# * `RANLIB' - `ranlib' archive index tool.
+RANLIB="xcrun -sdk $XCOMP_SDK ranlib"
+
+# * `AR' - `ar' archiving tool.
+AR="xcrun -sdk $XCOMP_SDK ar"
+
+# * `GETCONF' - `getconf' system configuration inspection tool. `getconf' is
+#   currently used for finding out large file support flags to use, and
+#   on Linux systems for finding out if we have an NPTL thread library or
+#   not.
+#GETCONF=
+
+## -- Cross System Root Locations ----------------------------------------------
+
+# * `erl_xcomp_sysroot' - The absolute path to the system root of the cross
+#   compilation environment. Currently, the `crypto', `odbc', `ssh' and
+#   `ssl' applications need the system root. These applications will be
+#   skipped if the system root has not been set. The system root might be
+#   needed for other things too. If this is the case and the system root
+#   has not been set, `configure' will fail and request you to set it.
+erl_xcomp_sysroot=$XCOMP_SDKROOT
+
+
+# * `erl_xcomp_isysroot' - The absolute path to the system root for includes
+#   of the cross compilation environment. If not set, this value defaults
+#   to `$erl_xcomp_sysroot', i.e., only set this value if the include system
+#   root path is not the same as the system root path.
+#erl_xcomp_isysroot=
+
+## -- Optional Feature, and Bug Tests ------------------------------------------
+
+## These tests cannot (always) be done automatically when cross compiling. You
+## usually do not need to set these variables. Only set these if you really
+## know what you are doing.
+
+## Note that some of these values will override results of tests performed
+## by `configure', and some will not be used until `configure' is sure that
+## it cannot figure the result out.
+
+## The `configure' script will issue a warning when a default value is used.
+## When a variable has been set, no warning will be issued.
+
+# * `erl_xcomp_after_morecore_hook' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `__after_morecore_hook' that can be
+#   used for tracking used `malloc()' implementations core memory usage.
+#   This is currently only used by unsupported features.
+#erl_xcomp_after_morecore_hook=
+
+# * `erl_xcomp_bigendian' - `yes|no'. No default. If `yes', the target system
+#   must be big endian. If `no', little endian. This can often be
+#   automatically detected, but not always. If not automatically detected,
+#   `configure' will fail unless this variable is set. Since no default
+#   value is used, `configure' will try to figure this out automatically.
+#erl_xcomp_bigendian=
+
+# * `erl_xcomp_clock_gettime_cpu_time' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `clock_gettime()' implementation
+#   that can be used for retrieving process CPU time.
+#erl_xcomp_clock_gettime_cpu_time=
+
+# * `erl_xcomp_getaddrinfo' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `getaddrinfo()' implementation that can
+#   handle both IPv4 and IPv6.
+#erl_xcomp_getaddrinfo=
+
+# * `erl_xcomp_gethrvtime_procfs_ioctl' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `gethrvtime()' implementation and
+#   is used with procfs `ioctl()'.
+#erl_xcomp_gethrvtime_procfs_ioctl=
+
+# * `erl_xcomp_dlsym_brk_wrappers' - `yes|no'. Defaults to `no'. If `yes', the
+#   target system must have a working `dlsym(RTLD_NEXT, <S>)' implementation
+#   that can be used on `brk' and `sbrk' symbols used by the `malloc()'
+#   implementation in use, and by this track the `malloc()' implementations
+#   core memory usage. This is currently only used by unsupported features.
+#erl_xcomp_dlsym_brk_wrappers=
+
+# * `erl_xcomp_kqueue' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `kqueue()' implementation that returns a file
+#   descriptor which can be used by `poll()' and/or `select()'. If `no' and
+#   the target system has not got `epoll()' or `/dev/poll', the kernel-poll
+#   feature will be disabled.
+#erl_xcomp_kqueue=
+
+# * `erl_xcomp_linux_clock_gettime_correction' - `yes|no'. Defaults to `yes' on
+#   Linux; otherwise, `no'. If `yes', `clock_gettime(CLOCK_MONOTONIC, _)' on
+#   the target system must work. This variable is recommended to be set to
+#   `no' on Linux systems with kernel versions less than 2.6.
+#erl_xcomp_linux_clock_gettime_correction=
+
+# * `erl_xcomp_linux_nptl' - `yes|no'. Defaults to `yes' on Linux; otherwise,
+#   `no'. If `yes', the target system must have NPTL (Native POSIX Thread
+#   Library). Older Linux systems have LinuxThreads instead of NPTL (Linux
+#   kernel versions typically less than 2.6).
+#erl_xcomp_linux_nptl=
+
+# * `erl_xcomp_linux_usable_sigaltstack' - `yes|no'. Defaults to `yes' on Linux;
+#   otherwise, `no'. If `yes', `sigaltstack()' must be usable on the target
+#   system. `sigaltstack()' on Linux kernel versions less than 2.4 are
+#   broken.
+#erl_xcomp_linux_usable_sigaltstack=
+
+# * `erl_xcomp_linux_usable_sigusrx' - `yes|no'. Defaults to `yes'. If `yes',
+#   the `SIGUSR1' and `SIGUSR2' signals must be usable by the ERTS. Old
+#   LinuxThreads thread libraries (Linux kernel versions typically less than
+#   2.2) used these signals and made them unusable by the ERTS.
+#erl_xcomp_linux_usable_sigusrx=
+
+# * `erl_xcomp_poll' - `yes|no'. Defaults to `no' on Darwin/MacOSX; otherwise,
+#   `yes'. If `yes', the target system must have a working `poll()'
+#   implementation that also can handle devices. If `no', `select()' will be
+#   used instead of `poll()'.
+#erl_xcomp_poll=
+
+# * `erl_xcomp_putenv_copy' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a `putenv()' implementation that stores a copy of the
+#   key/value pair.
+#erl_xcomp_putenv_copy=
+
+# * `erl_xcomp_reliable_fpe' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have reliable floating point exceptions.
+#erl_xcomp_reliable_fpe=
+
+## -----------------------------------------------------------------------------
diff --git a/xcomp/erl-xcomp-arm64-iossimulator.conf b/xcomp/erl-xcomp-arm64-iossimulator.conf
new file mode 100644
index 0000000000..2d9157007d
--- /dev/null
+++ b/xcomp/erl-xcomp-arm64-iossimulator.conf
@@ -0,0 +1,269 @@
+## -*-shell-script-*-
+##
+## %CopyrightBegin%
+##
+## Copyright Ericsson AB 2009-2019. All Rights Reserved.
+##
+## Licensed under the Apache License, Version 2.0 (the "License");
+## you may not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+##     http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+## %CopyrightEnd%
+##
+## File: erl-xcomp-arm64-iossimulator.conf
+## Author: Dominic Letz
+##
+## -----------------------------------------------------------------------------
+## When cross compiling Erlang/OTP using `otp_build', copy this file and set
+## the variables needed below. Then pass the path to the copy of this file as
+## an argument to `otp_build' in the configure stage:
+##   `otp_build configure --xcomp-conf=<FILE>'
+## -----------------------------------------------------------------------------
+
+## Note that you cannot define arbitrary variables in a cross compilation
+## configuration file. Only the ones listed below will be guaranteed to be
+## visible throughout the whole execution of all `configure' scripts. Other
+## variables needs to be defined as arguments to `configure' or exported in
+## the environment.
+
+## -- Variables for `otp_build' Only -------------------------------------------
+
+## Variables in this section are only used, when configuring Erlang/OTP for
+## cross compilation using `$ERL_TOP/otp_build configure'.
+
+## *NOTE*! These variables currently have *no* effect if you configure using
+## the `configure' script directly.
+
+# * `erl_xcomp_build' - The build system used. This value will be passed as
+#   `--build=$erl_xcomp_build' argument to the `configure' script. It does
+#   not have to be a full `CPU-VENDOR-OS' triplet, but can be. The full
+#   `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_build'. If set to `guess',
+#   the build system will be guessed using
+#   `$ERL_TOP/erts/autoconf/config.guess'.
+erl_xcomp_build=guess
+
+# * `erl_xcomp_host' - Cross host/target system to build for. This value will
+#   be passed as `--host=$erl_xcomp_host' argument to the `configure' script.
+#   It does not have to be a full `CPU-VENDOR-OS' triplet, but can be. The
+#   full `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_host'.
+erl_xcomp_host=arm64-apple-iossimulator
+
+# * `erl_xcomp_configure_flags' - Extra configure flags to pass to the
+#   `configure' script.
+erl_xcomp_configure_flags="--without-termcap --without-wx \
+    --without-javac --without-odbc \
+    --without-debugger --without-observer --without-cdv --without-et \
+    --enable-builtin-zlib --enable-static-nifs --enable-static-drivers \
+    --disable-jit"
+
+
+## -- Cross Compiler and Other Tools -------------------------------------------
+
+## If the cross compilation tools are prefixed by `<HOST>-' you probably do
+## not need to set these variables (where `<HOST>' is what has been passed as
+## `--host=<HOST>' argument to `configure').
+
+## All variables in this section can also be used when native compiling.
+
+export XCOMP_SDK=iphonesimulator
+export XCOMP_SDKROOT=`xcrun -sdk $XCOMP_SDK --show-sdk-path`
+export XCOMP_ARCH="-arch arm64"
+
+# * `CC' - C compiler.
+CC="xcrun -sdk $XCOMP_SDK cc $XCOMP_ARCH"
+
+# * `CFLAGS' - C compiler flags.
+CFLAGS="-mios-simulator-version-min=7.0.0 -fno-common -Os -D__IOS__=yes"
+
+# * `STATIC_CFLAGS' - Static C compiler flags.
+#STATIC_CFLAGS=
+
+# * `CFLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for the shared libraries. Note that this actually is a
+#   linker flag, but it needs to be passed via the compiler.
+#CFLAG_RUNTIME_LIBRARY_PATH=
+
+# * `CPP' - C pre-processor.
+#CPP=
+
+# * `CPPFLAGS' - C pre-processor flags.
+#CPPFLAGS=
+
+# * `CXX' - C++ compiler.
+CXX="xcrun -sdk $XCOMP_SDK c++ $XCOMP_ARCH"
+
+# * `CXXFLAGS' - C++ compiler flags.
+CXXFLAGS=$CFLAGS
+
+# * `LD' - Linker.
+LD="xcrun -sdk $XCOMP_SDK ld $XCOMP_ARCH"
+
+# * `LDFLAGS' - Linker flags.
+LDFLAGS="-L$XCOMP_SDKROOT/usr/lib/ -lc++ -v"
+
+# * `LIBS' - Libraries.
+#LIBS=
+
+## -- *D*ynamic *E*rlang *D*river Linking --
+
+## *NOTE*! Either set all or none of the `DED_LD*' variables.
+
+# * `DED_LD' - Linker for Dynamically loaded Erlang Drivers.
+DED_LD=$LD
+
+# * `DED_LDFLAGS' - Linker flags to use with `DED_LD'.
+DED_LDFLAGS="-L$XCOMP_SDKROOT/usr/lib/ -r -v"
+
+# * `DED_LD_FLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for shared libraries when linking with `DED_LD'.
+#DED_LD_FLAG_RUNTIME_LIBRARY_PATH=
+
+## -- Large File Support --
+
+## *NOTE*! Either set all or none of the `LFS_*' variables.
+
+# * `LFS_CFLAGS' - Large file support C compiler flags.
+#LFS_CFLAGS=
+
+# * `LFS_LDFLAGS' - Large file support linker flags.
+#LFS_LDFLAGS=
+
+# * `LFS_LIBS' - Large file support libraries.
+#LFS_LIBS=
+
+## -- Other Tools --
+
+# * `RANLIB' - `ranlib' archive index tool.
+RANLIB="xcrun -sdk $XCOMP_SDK ranlib"
+
+# * `AR' - `ar' archiving tool.
+AR="xcrun -sdk $XCOMP_SDK ar"
+
+# * `GETCONF' - `getconf' system configuration inspection tool. `getconf' is
+#   currently used for finding out large file support flags to use, and
+#   on Linux systems for finding out if we have an NPTL thread library or
+#   not.
+#GETCONF=
+
+## -- Cross System Root Locations ----------------------------------------------
+
+# * `erl_xcomp_sysroot' - The absolute path to the system root of the cross
+#   compilation environment. Currently, the `crypto', `odbc', `ssh' and
+#   `ssl' applications need the system root. These applications will be
+#   skipped if the system root has not been set. The system root might be
+#   needed for other things too. If this is the case and the system root
+#   has not been set, `configure' will fail and request you to set it.
+erl_xcomp_sysroot=$XCOMP_SDKROOT
+
+
+# * `erl_xcomp_isysroot' - The absolute path to the system root for includes
+#   of the cross compilation environment. If not set, this value defaults
+#   to `$erl_xcomp_sysroot', i.e., only set this value if the include system
+#   root path is not the same as the system root path.
+#erl_xcomp_isysroot=
+
+## -- Optional Feature, and Bug Tests ------------------------------------------
+
+## These tests cannot (always) be done automatically when cross compiling. You
+## usually do not need to set these variables. Only set these if you really
+## know what you are doing.
+
+## Note that some of these values will override results of tests performed
+## by `configure', and some will not be used until `configure' is sure that
+## it cannot figure the result out.
+
+## The `configure' script will issue a warning when a default value is used.
+## When a variable has been set, no warning will be issued.
+
+# * `erl_xcomp_after_morecore_hook' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `__after_morecore_hook' that can be
+#   used for tracking used `malloc()' implementations core memory usage.
+#   This is currently only used by unsupported features.
+#erl_xcomp_after_morecore_hook=
+
+# * `erl_xcomp_bigendian' - `yes|no'. No default. If `yes', the target system
+#   must be big endian. If `no', little endian. This can often be
+#   automatically detected, but not always. If not automatically detected,
+#   `configure' will fail unless this variable is set. Since no default
+#   value is used, `configure' will try to figure this out automatically.
+#erl_xcomp_bigendian=
+
+# * `erl_xcomp_clock_gettime_cpu_time' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `clock_gettime()' implementation
+#   that can be used for retrieving process CPU time.
+#erl_xcomp_clock_gettime_cpu_time=
+
+# * `erl_xcomp_getaddrinfo' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `getaddrinfo()' implementation that can
+#   handle both IPv4 and IPv6.
+#erl_xcomp_getaddrinfo=
+
+# * `erl_xcomp_gethrvtime_procfs_ioctl' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `gethrvtime()' implementation and
+#   is used with procfs `ioctl()'.
+#erl_xcomp_gethrvtime_procfs_ioctl=
+
+# * `erl_xcomp_dlsym_brk_wrappers' - `yes|no'. Defaults to `no'. If `yes', the
+#   target system must have a working `dlsym(RTLD_NEXT, <S>)' implementation
+#   that can be used on `brk' and `sbrk' symbols used by the `malloc()'
+#   implementation in use, and by this track the `malloc()' implementations
+#   core memory usage. This is currently only used by unsupported features.
+#erl_xcomp_dlsym_brk_wrappers=
+
+# * `erl_xcomp_kqueue' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `kqueue()' implementation that returns a file
+#   descriptor which can be used by `poll()' and/or `select()'. If `no' and
+#   the target system has not got `epoll()' or `/dev/poll', the kernel-poll
+#   feature will be disabled.
+#erl_xcomp_kqueue=
+
+# * `erl_xcomp_linux_clock_gettime_correction' - `yes|no'. Defaults to `yes' on
+#   Linux; otherwise, `no'. If `yes', `clock_gettime(CLOCK_MONOTONIC, _)' on
+#   the target system must work. This variable is recommended to be set to
+#   `no' on Linux systems with kernel versions less than 2.6.
+#erl_xcomp_linux_clock_gettime_correction=
+
+# * `erl_xcomp_linux_nptl' - `yes|no'. Defaults to `yes' on Linux; otherwise,
+#   `no'. If `yes', the target system must have NPTL (Native POSIX Thread
+#   Library). Older Linux systems have LinuxThreads instead of NPTL (Linux
+#   kernel versions typically less than 2.6).
+#erl_xcomp_linux_nptl=
+
+# * `erl_xcomp_linux_usable_sigaltstack' - `yes|no'. Defaults to `yes' on Linux;
+#   otherwise, `no'. If `yes', `sigaltstack()' must be usable on the target
+#   system. `sigaltstack()' on Linux kernel versions less than 2.4 are
+#   broken.
+#erl_xcomp_linux_usable_sigaltstack=
+
+# * `erl_xcomp_linux_usable_sigusrx' - `yes|no'. Defaults to `yes'. If `yes',
+#   the `SIGUSR1' and `SIGUSR2' signals must be usable by the ERTS. Old
+#   LinuxThreads thread libraries (Linux kernel versions typically less than
+#   2.2) used these signals and made them unusable by the ERTS.
+#erl_xcomp_linux_usable_sigusrx=
+
+# * `erl_xcomp_poll' - `yes|no'. Defaults to `no' on Darwin/MacOSX; otherwise,
+#   `yes'. If `yes', the target system must have a working `poll()'
+#   implementation that also can handle devices. If `no', `select()' will be
+#   used instead of `poll()'.
+#erl_xcomp_poll=
+
+# * `erl_xcomp_putenv_copy' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a `putenv()' implementation that stores a copy of the
+#   key/value pair.
+#erl_xcomp_putenv_copy=
+
+# * `erl_xcomp_reliable_fpe' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have reliable floating point exceptions.
+#erl_xcomp_reliable_fpe=
+
+## -----------------------------------------------------------------------------
diff --git a/xcomp/erl-xcomp-host-iossimulator.conf b/xcomp/erl-xcomp-host-iossimulator.conf
new file mode 100644
index 0000000000..33ac1e5987
--- /dev/null
+++ b/xcomp/erl-xcomp-host-iossimulator.conf
@@ -0,0 +1,268 @@
+## -*-shell-script-*-
+##
+## %CopyrightBegin%
+##
+## Copyright Ericsson AB 2009-2019. All Rights Reserved.
+##
+## Licensed under the Apache License, Version 2.0 (the "License");
+## you may not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+##     http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+## %CopyrightEnd%
+##
+## File: erl-xcomp-host-iossimulator.conf
+## Author: Dominic Letz
+##
+## -----------------------------------------------------------------------------
+## When cross compiling Erlang/OTP using `otp_build', copy this file and set
+## the variables needed below. Then pass the path to the copy of this file as
+## an argument to `otp_build' in the configure stage:
+##   `otp_build configure --xcomp-conf=<FILE>'
+## -----------------------------------------------------------------------------
+
+## Note that you cannot define arbitrary variables in a cross compilation
+## configuration file. Only the ones listed below will be guaranteed to be
+## visible throughout the whole execution of all `configure' scripts. Other
+## variables needs to be defined as arguments to `configure' or exported in
+## the environment.
+
+## -- Variables for `otp_build' Only -------------------------------------------
+
+## Variables in this section are only used, when configuring Erlang/OTP for
+## cross compilation using `$ERL_TOP/otp_build configure'.
+
+## *NOTE*! These variables currently have *no* effect if you configure using
+## the `configure' script directly.
+
+# * `erl_xcomp_build' - The build system used. This value will be passed as
+#   `--build=$erl_xcomp_build' argument to the `configure' script. It does
+#   not have to be a full `CPU-VENDOR-OS' triplet, but can be. The full
+#   `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_build'. If set to `guess',
+#   the build system will be guessed using
+#   `$ERL_TOP/erts/autoconf/config.guess'.
+erl_xcomp_build=guess
+
+# * `erl_xcomp_host' - Cross host/target system to build for. This value will
+#   be passed as `--host=$erl_xcomp_host' argument to the `configure' script.
+#   It does not have to be a full `CPU-VENDOR-OS' triplet, but can be. The
+#   full `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_host'.
+erl_xcomp_host=`arch`-apple-iossimulator
+
+# * `erl_xcomp_configure_flags' - Extra configure flags to pass to the
+#   `configure' script.
+erl_xcomp_configure_flags="--without-termcap --without-wx \
+    --without-javac --without-odbc \
+    --without-debugger --without-observer --without-cdv --without-et \
+    --enable-builtin-zlib --enable-static-nifs --enable-static-drivers"
+
+
+## -- Cross Compiler and Other Tools -------------------------------------------
+
+## If the cross compilation tools are prefixed by `<HOST>-' you probably do
+## not need to set these variables (where `<HOST>' is what has been passed as
+## `--host=<HOST>' argument to `configure').
+
+## All variables in this section can also be used when native compiling.
+
+export XCOMP_SDK=iphonesimulator
+export XCOMP_SDKROOT=`xcrun -sdk $XCOMP_SDK --show-sdk-path`
+export XCOMP_ARCH="-arch `arch`"
+
+# * `CC' - C compiler.
+CC="xcrun -sdk $XCOMP_SDK cc $XCOMP_ARCH"
+
+# * `CFLAGS' - C compiler flags.
+CFLAGS="-mios-simulator-version-min=7.0.0 -fno-common -Os -D__IOS__=yes"
+
+# * `STATIC_CFLAGS' - Static C compiler flags.
+#STATIC_CFLAGS=
+
+# * `CFLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for the shared libraries. Note that this actually is a
+#   linker flag, but it needs to be passed via the compiler.
+#CFLAG_RUNTIME_LIBRARY_PATH=
+
+# * `CPP' - C pre-processor.
+#CPP=
+
+# * `CPPFLAGS' - C pre-processor flags.
+#CPPFLAGS=
+
+# * `CXX' - C++ compiler.
+CXX="xcrun -sdk $XCOMP_SDK c++ $XCOMP_ARCH"
+
+# * `CXXFLAGS' - C++ compiler flags.
+CXXFLAGS=$CFLAGS
+
+# * `LD' - Linker.
+LD="xcrun -sdk $XCOMP_SDK ld $XCOMP_ARCH"
+
+# * `LDFLAGS' - Linker flags.
+LDFLAGS="-L$XCOMP_SDKROOT/usr/lib/ -lc++ -v"
+
+# * `LIBS' - Libraries.
+#LIBS=
+
+## -- *D*ynamic *E*rlang *D*river Linking --
+
+## *NOTE*! Either set all or none of the `DED_LD*' variables.
+
+# * `DED_LD' - Linker for Dynamically loaded Erlang Drivers.
+DED_LD=$LD
+
+# * `DED_LDFLAGS' - Linker flags to use with `DED_LD'.
+DED_LDFLAGS="-L$XCOMP_SDKROOT/usr/lib/ -r -v"
+
+# * `DED_LD_FLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for shared libraries when linking with `DED_LD'.
+#DED_LD_FLAG_RUNTIME_LIBRARY_PATH=
+
+## -- Large File Support --
+
+## *NOTE*! Either set all or none of the `LFS_*' variables.
+
+# * `LFS_CFLAGS' - Large file support C compiler flags.
+#LFS_CFLAGS=
+
+# * `LFS_LDFLAGS' - Large file support linker flags.
+#LFS_LDFLAGS=
+
+# * `LFS_LIBS' - Large file support libraries.
+#LFS_LIBS=
+
+## -- Other Tools --
+
+# * `RANLIB' - `ranlib' archive index tool.
+RANLIB="xcrun -sdk $XCOMP_SDK ranlib"
+
+# * `AR' - `ar' archiving tool.
+AR="xcrun -sdk $XCOMP_SDK ar"
+
+# * `GETCONF' - `getconf' system configuration inspection tool. `getconf' is
+#   currently used for finding out large file support flags to use, and
+#   on Linux systems for finding out if we have an NPTL thread library or
+#   not.
+#GETCONF=
+
+## -- Cross System Root Locations ----------------------------------------------
+
+# * `erl_xcomp_sysroot' - The absolute path to the system root of the cross
+#   compilation environment. Currently, the `crypto', `odbc', `ssh' and
+#   `ssl' applications need the system root. These applications will be
+#   skipped if the system root has not been set. The system root might be
+#   needed for other things too. If this is the case and the system root
+#   has not been set, `configure' will fail and request you to set it.
+erl_xcomp_sysroot=$XCOMP_SDKROOT
+
+
+# * `erl_xcomp_isysroot' - The absolute path to the system root for includes
+#   of the cross compilation environment. If not set, this value defaults
+#   to `$erl_xcomp_sysroot', i.e., only set this value if the include system
+#   root path is not the same as the system root path.
+#erl_xcomp_isysroot=
+
+## -- Optional Feature, and Bug Tests ------------------------------------------
+
+## These tests cannot (always) be done automatically when cross compiling. You
+## usually do not need to set these variables. Only set these if you really
+## know what you are doing.
+
+## Note that some of these values will override results of tests performed
+## by `configure', and some will not be used until `configure' is sure that
+## it cannot figure the result out.
+
+## The `configure' script will issue a warning when a default value is used.
+## When a variable has been set, no warning will be issued.
+
+# * `erl_xcomp_after_morecore_hook' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `__after_morecore_hook' that can be
+#   used for tracking used `malloc()' implementations core memory usage.
+#   This is currently only used by unsupported features.
+#erl_xcomp_after_morecore_hook=
+
+# * `erl_xcomp_bigendian' - `yes|no'. No default. If `yes', the target system
+#   must be big endian. If `no', little endian. This can often be
+#   automatically detected, but not always. If not automatically detected,
+#   `configure' will fail unless this variable is set. Since no default
+#   value is used, `configure' will try to figure this out automatically.
+#erl_xcomp_bigendian=
+
+# * `erl_xcomp_clock_gettime_cpu_time' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `clock_gettime()' implementation
+#   that can be used for retrieving process CPU time.
+#erl_xcomp_clock_gettime_cpu_time=
+
+# * `erl_xcomp_getaddrinfo' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `getaddrinfo()' implementation that can
+#   handle both IPv4 and IPv6.
+#erl_xcomp_getaddrinfo=
+
+# * `erl_xcomp_gethrvtime_procfs_ioctl' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `gethrvtime()' implementation and
+#   is used with procfs `ioctl()'.
+#erl_xcomp_gethrvtime_procfs_ioctl=
+
+# * `erl_xcomp_dlsym_brk_wrappers' - `yes|no'. Defaults to `no'. If `yes', the
+#   target system must have a working `dlsym(RTLD_NEXT, <S>)' implementation
+#   that can be used on `brk' and `sbrk' symbols used by the `malloc()'
+#   implementation in use, and by this track the `malloc()' implementations
+#   core memory usage. This is currently only used by unsupported features.
+#erl_xcomp_dlsym_brk_wrappers=
+
+# * `erl_xcomp_kqueue' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `kqueue()' implementation that returns a file
+#   descriptor which can be used by `poll()' and/or `select()'. If `no' and
+#   the target system has not got `epoll()' or `/dev/poll', the kernel-poll
+#   feature will be disabled.
+#erl_xcomp_kqueue=
+
+# * `erl_xcomp_linux_clock_gettime_correction' - `yes|no'. Defaults to `yes' on
+#   Linux; otherwise, `no'. If `yes', `clock_gettime(CLOCK_MONOTONIC, _)' on
+#   the target system must work. This variable is recommended to be set to
+#   `no' on Linux systems with kernel versions less than 2.6.
+#erl_xcomp_linux_clock_gettime_correction=
+
+# * `erl_xcomp_linux_nptl' - `yes|no'. Defaults to `yes' on Linux; otherwise,
+#   `no'. If `yes', the target system must have NPTL (Native POSIX Thread
+#   Library). Older Linux systems have LinuxThreads instead of NPTL (Linux
+#   kernel versions typically less than 2.6).
+#erl_xcomp_linux_nptl=
+
+# * `erl_xcomp_linux_usable_sigaltstack' - `yes|no'. Defaults to `yes' on Linux;
+#   otherwise, `no'. If `yes', `sigaltstack()' must be usable on the target
+#   system. `sigaltstack()' on Linux kernel versions less than 2.4 are
+#   broken.
+#erl_xcomp_linux_usable_sigaltstack=
+
+# * `erl_xcomp_linux_usable_sigusrx' - `yes|no'. Defaults to `yes'. If `yes',
+#   the `SIGUSR1' and `SIGUSR2' signals must be usable by the ERTS. Old
+#   LinuxThreads thread libraries (Linux kernel versions typically less than
+#   2.2) used these signals and made them unusable by the ERTS.
+#erl_xcomp_linux_usable_sigusrx=
+
+# * `erl_xcomp_poll' - `yes|no'. Defaults to `no' on Darwin/MacOSX; otherwise,
+#   `yes'. If `yes', the target system must have a working `poll()'
+#   implementation that also can handle devices. If `no', `select()' will be
+#   used instead of `poll()'.
+#erl_xcomp_poll=
+
+# * `erl_xcomp_putenv_copy' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a `putenv()' implementation that stores a copy of the
+#   key/value pair.
+#erl_xcomp_putenv_copy=
+
+# * `erl_xcomp_reliable_fpe' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have reliable floating point exceptions.
+#erl_xcomp_reliable_fpe=
+
+## -----------------------------------------------------------------------------
diff --git a/xcomp/erl-xcomp-x86_64-iossimulator.conf b/xcomp/erl-xcomp-x86_64-iossimulator.conf
new file mode 100644
index 0000000000..a91b7be342
--- /dev/null
+++ b/xcomp/erl-xcomp-x86_64-iossimulator.conf
@@ -0,0 +1,269 @@
+## -*-shell-script-*-
+##
+## %CopyrightBegin%
+##
+## Copyright Ericsson AB 2009-2019. All Rights Reserved.
+##
+## Licensed under the Apache License, Version 2.0 (the "License");
+## you may not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+##     http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+## %CopyrightEnd%
+##
+## File: erl-xcomp-x86_64-iossimulator.conf
+## Author: Dominic Letz
+##
+## -----------------------------------------------------------------------------
+## When cross compiling Erlang/OTP using `otp_build', copy this file and set
+## the variables needed below. Then pass the path to the copy of this file as
+## an argument to `otp_build' in the configure stage:
+##   `otp_build configure --xcomp-conf=<FILE>'
+## -----------------------------------------------------------------------------
+
+## Note that you cannot define arbitrary variables in a cross compilation
+## configuration file. Only the ones listed below will be guaranteed to be
+## visible throughout the whole execution of all `configure' scripts. Other
+## variables needs to be defined as arguments to `configure' or exported in
+## the environment.
+
+## -- Variables for `otp_build' Only -------------------------------------------
+
+## Variables in this section are only used, when configuring Erlang/OTP for
+## cross compilation using `$ERL_TOP/otp_build configure'.
+
+## *NOTE*! These variables currently have *no* effect if you configure using
+## the `configure' script directly.
+
+# * `erl_xcomp_build' - The build system used. This value will be passed as
+#   `--build=$erl_xcomp_build' argument to the `configure' script. It does
+#   not have to be a full `CPU-VENDOR-OS' triplet, but can be. The full
+#   `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_build'. If set to `guess',
+#   the build system will be guessed using
+#   `$ERL_TOP/erts/autoconf/config.guess'.
+erl_xcomp_build=guess
+
+# * `erl_xcomp_host' - Cross host/target system to build for. This value will
+#   be passed as `--host=$erl_xcomp_host' argument to the `configure' script.
+#   It does not have to be a full `CPU-VENDOR-OS' triplet, but can be. The
+#   full `CPU-VENDOR-OS' triplet will be created by
+#   `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_host'.
+erl_xcomp_host=x86_64-apple-iossimulator
+
+# * `erl_xcomp_configure_flags' - Extra configure flags to pass to the
+#   `configure' script.
+erl_xcomp_configure_flags="--without-termcap --without-wx \
+    --without-javac --without-odbc \
+    --without-debugger --without-observer --without-cdv --without-et \
+    --enable-builtin-zlib --enable-static-nifs --enable-static-drivers \
+    --disable-jit"
+
+
+## -- Cross Compiler and Other Tools -------------------------------------------
+
+## If the cross compilation tools are prefixed by `<HOST>-' you probably do
+## not need to set these variables (where `<HOST>' is what has been passed as
+## `--host=<HOST>' argument to `configure').
+
+## All variables in this section can also be used when native compiling.
+
+export XCOMP_SDK=iphonesimulator
+export XCOMP_SDKROOT=`xcrun -sdk $XCOMP_SDK --show-sdk-path`
+export XCOMP_ARCH="-arch x86_64"
+
+# * `CC' - C compiler.
+CC="xcrun -sdk $XCOMP_SDK cc $XCOMP_ARCH"
+
+# * `CFLAGS' - C compiler flags.
+CFLAGS="-mios-simulator-version-min=7.0.0 -fno-common -Os -D__IOS__=yes"
+
+# * `STATIC_CFLAGS' - Static C compiler flags.
+#STATIC_CFLAGS=
+
+# * `CFLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for the shared libraries. Note that this actually is a
+#   linker flag, but it needs to be passed via the compiler.
+#CFLAG_RUNTIME_LIBRARY_PATH=
+
+# * `CPP' - C pre-processor.
+#CPP=
+
+# * `CPPFLAGS' - C pre-processor flags.
+#CPPFLAGS=
+
+# * `CXX' - C++ compiler.
+CXX="xcrun -sdk $XCOMP_SDK c++ $XCOMP_ARCH"
+
+# * `CXXFLAGS' - C++ compiler flags.
+CXXFLAGS=$CFLAGS
+
+# * `LD' - Linker.
+LD="xcrun -sdk $XCOMP_SDK ld $XCOMP_ARCH"
+
+# * `LDFLAGS' - Linker flags.
+LDFLAGS="-L$XCOMP_SDKROOT/usr/lib/ -lc++ -v"
+
+# * `LIBS' - Libraries.
+#LIBS=
+
+## -- *D*ynamic *E*rlang *D*river Linking --
+
+## *NOTE*! Either set all or none of the `DED_LD*' variables.
+
+# * `DED_LD' - Linker for Dynamically loaded Erlang Drivers.
+DED_LD=$LD
+
+# * `DED_LDFLAGS' - Linker flags to use with `DED_LD'.
+DED_LDFLAGS="-L$XCOMP_SDKROOT/usr/lib/ -r -v"
+
+# * `DED_LD_FLAG_RUNTIME_LIBRARY_PATH' - This flag should set runtime library
+#   search path for shared libraries when linking with `DED_LD'.
+#DED_LD_FLAG_RUNTIME_LIBRARY_PATH=
+
+## -- Large File Support --
+
+## *NOTE*! Either set all or none of the `LFS_*' variables.
+
+# * `LFS_CFLAGS' - Large file support C compiler flags.
+#LFS_CFLAGS=
+
+# * `LFS_LDFLAGS' - Large file support linker flags.
+#LFS_LDFLAGS=
+
+# * `LFS_LIBS' - Large file support libraries.
+#LFS_LIBS=
+
+## -- Other Tools --
+
+# * `RANLIB' - `ranlib' archive index tool.
+RANLIB="xcrun -sdk $XCOMP_SDK ranlib"
+
+# * `AR' - `ar' archiving tool.
+AR="xcrun -sdk $XCOMP_SDK ar"
+
+# * `GETCONF' - `getconf' system configuration inspection tool. `getconf' is
+#   currently used for finding out large file support flags to use, and
+#   on Linux systems for finding out if we have an NPTL thread library or
+#   not.
+#GETCONF=
+
+## -- Cross System Root Locations ----------------------------------------------
+
+# * `erl_xcomp_sysroot' - The absolute path to the system root of the cross
+#   compilation environment. Currently, the `crypto', `odbc', `ssh' and
+#   `ssl' applications need the system root. These applications will be
+#   skipped if the system root has not been set. The system root might be
+#   needed for other things too. If this is the case and the system root
+#   has not been set, `configure' will fail and request you to set it.
+erl_xcomp_sysroot=$XCOMP_SDKROOT
+
+
+# * `erl_xcomp_isysroot' - The absolute path to the system root for includes
+#   of the cross compilation environment. If not set, this value defaults
+#   to `$erl_xcomp_sysroot', i.e., only set this value if the include system
+#   root path is not the same as the system root path.
+#erl_xcomp_isysroot=
+
+## -- Optional Feature, and Bug Tests ------------------------------------------
+
+## These tests cannot (always) be done automatically when cross compiling. You
+## usually do not need to set these variables. Only set these if you really
+## know what you are doing.
+
+## Note that some of these values will override results of tests performed
+## by `configure', and some will not be used until `configure' is sure that
+## it cannot figure the result out.
+
+## The `configure' script will issue a warning when a default value is used.
+## When a variable has been set, no warning will be issued.
+
+# * `erl_xcomp_after_morecore_hook' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `__after_morecore_hook' that can be
+#   used for tracking used `malloc()' implementations core memory usage.
+#   This is currently only used by unsupported features.
+#erl_xcomp_after_morecore_hook=
+
+# * `erl_xcomp_bigendian' - `yes|no'. No default. If `yes', the target system
+#   must be big endian. If `no', little endian. This can often be
+#   automatically detected, but not always. If not automatically detected,
+#   `configure' will fail unless this variable is set. Since no default
+#   value is used, `configure' will try to figure this out automatically.
+#erl_xcomp_bigendian=
+
+# * `erl_xcomp_clock_gettime_cpu_time' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `clock_gettime()' implementation
+#   that can be used for retrieving process CPU time.
+#erl_xcomp_clock_gettime_cpu_time=
+
+# * `erl_xcomp_getaddrinfo' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `getaddrinfo()' implementation that can
+#   handle both IPv4 and IPv6.
+#erl_xcomp_getaddrinfo=
+
+# * `erl_xcomp_gethrvtime_procfs_ioctl' - `yes|no'. Defaults to `no'. If `yes',
+#   the target system must have a working `gethrvtime()' implementation and
+#   is used with procfs `ioctl()'.
+#erl_xcomp_gethrvtime_procfs_ioctl=
+
+# * `erl_xcomp_dlsym_brk_wrappers' - `yes|no'. Defaults to `no'. If `yes', the
+#   target system must have a working `dlsym(RTLD_NEXT, <S>)' implementation
+#   that can be used on `brk' and `sbrk' symbols used by the `malloc()'
+#   implementation in use, and by this track the `malloc()' implementations
+#   core memory usage. This is currently only used by unsupported features.
+#erl_xcomp_dlsym_brk_wrappers=
+
+# * `erl_xcomp_kqueue' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a working `kqueue()' implementation that returns a file
+#   descriptor which can be used by `poll()' and/or `select()'. If `no' and
+#   the target system has not got `epoll()' or `/dev/poll', the kernel-poll
+#   feature will be disabled.
+#erl_xcomp_kqueue=
+
+# * `erl_xcomp_linux_clock_gettime_correction' - `yes|no'. Defaults to `yes' on
+#   Linux; otherwise, `no'. If `yes', `clock_gettime(CLOCK_MONOTONIC, _)' on
+#   the target system must work. This variable is recommended to be set to
+#   `no' on Linux systems with kernel versions less than 2.6.
+#erl_xcomp_linux_clock_gettime_correction=
+
+# * `erl_xcomp_linux_nptl' - `yes|no'. Defaults to `yes' on Linux; otherwise,
+#   `no'. If `yes', the target system must have NPTL (Native POSIX Thread
+#   Library). Older Linux systems have LinuxThreads instead of NPTL (Linux
+#   kernel versions typically less than 2.6).
+#erl_xcomp_linux_nptl=
+
+# * `erl_xcomp_linux_usable_sigaltstack' - `yes|no'. Defaults to `yes' on Linux;
+#   otherwise, `no'. If `yes', `sigaltstack()' must be usable on the target
+#   system. `sigaltstack()' on Linux kernel versions less than 2.4 are
+#   broken.
+#erl_xcomp_linux_usable_sigaltstack=
+
+# * `erl_xcomp_linux_usable_sigusrx' - `yes|no'. Defaults to `yes'. If `yes',
+#   the `SIGUSR1' and `SIGUSR2' signals must be usable by the ERTS. Old
+#   LinuxThreads thread libraries (Linux kernel versions typically less than
+#   2.2) used these signals and made them unusable by the ERTS.
+#erl_xcomp_linux_usable_sigusrx=
+
+# * `erl_xcomp_poll' - `yes|no'. Defaults to `no' on Darwin/MacOSX; otherwise,
+#   `yes'. If `yes', the target system must have a working `poll()'
+#   implementation that also can handle devices. If `no', `select()' will be
+#   used instead of `poll()'.
+#erl_xcomp_poll=
+
+# * `erl_xcomp_putenv_copy' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have a `putenv()' implementation that stores a copy of the
+#   key/value pair.
+#erl_xcomp_putenv_copy=
+
+# * `erl_xcomp_reliable_fpe' - `yes|no'. Defaults to `no'. If `yes', the target
+#   system must have reliable floating point exceptions.
+#erl_xcomp_reliable_fpe=
+
+## -----------------------------------------------------------------------------
-- 
2.31.1

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File 2821-Compiling-static-beam-lib-for-iOS.patch of Package erlang (Revision 834576b566c5d6a655bbc8998ea53173)

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