File 0001-btrfs-progs-Add-optional-dependency-on-lib... of Package btrfsprogs.31993

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File 0001-btrfs-progs-Add-optional-dependency-on-libudev.patch of Package btrfsprogs.31993

From c03a8cab17c22f03dfebe910a567c9d547d173e1 Mon Sep 17 00:00:00 2001
From: Nikolay Borisov <nborisov@suse.com>
Date: Thu, 30 Sep 2021 15:06:32 +0300
Subject: [PATCH 1/3] btrfs-progs: Add optional dependency on libudev

This is needed for future code which will make btrfs-progs' device
scanning logic a little smarter by filtering out path device in
multipath setups. libudev is added as an optional dependency since the
library doesn't have a static version so making it a hard dependency
means forfeiting static build support. To alleviate this a fallback code
will be added for the static build case which doesn't rely on libudev.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
---
 Makefile        | 2 +-
 Makefile.inc.in | 2 +-
 configure.ac    | 9 +++++++++
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 93fe4c2b3e08..e96f66a36b46 100644
--- a/Makefile
+++ b/Makefile
@@ -129,7 +129,7 @@ LIBS = $(LIBS_BASE) $(LIBS_CRYPTO)
 LIBBTRFS_LIBS = $(LIBS_BASE) $(LIBS_CRYPTO)
 
 # Static compilation flags
-STATIC_CFLAGS = $(CFLAGS) -ffunction-sections -fdata-sections
+STATIC_CFLAGS = $(CFLAGS) -ffunction-sections -fdata-sections -DSTATIC_BUILD
 STATIC_LDFLAGS = -static -Wl,--gc-sections
 STATIC_LIBS = $(STATIC_LIBS_BASE)
 
diff --git a/Makefile.inc.in b/Makefile.inc.in
index 9f49337147b8..c995aef97219 100644
--- a/Makefile.inc.in
+++ b/Makefile.inc.in
@@ -27,7 +27,7 @@ CRYPTO_CFLAGS = @GCRYPT_CFLAGS@ @SODIUM_CFLAGS@ @KCAPI_CFLAGS@
 SUBST_CFLAGS = @CFLAGS@
 SUBST_LDFLAGS = @LDFLAGS@
 
-LIBS_BASE = @UUID_LIBS@ @BLKID_LIBS@ -L. -pthread
+LIBS_BASE = @UUID_LIBS@ @BLKID_LIBS@ @LIBUDEV_LIBS@ -L. -pthread
 LIBS_COMP = @ZLIB_LIBS@ @LZO2_LIBS@ @ZSTD_LIBS@
 LIBS_PYTHON = @PYTHON_LIBS@
 LIBS_CRYPTO = @GCRYPT_LIBS@ @SODIUM_LIBS@ @KCAPI_LIBS@
diff --git a/configure.ac b/configure.ac
index 038c2688421c..d0ceb0d70d16 100644
--- a/configure.ac
+++ b/configure.ac
@@ -304,6 +304,15 @@ PKG_STATIC(UUID_LIBS_STATIC, [uuid])
 PKG_CHECK_MODULES(ZLIB, [zlib])
 PKG_STATIC(ZLIB_LIBS_STATIC, [zlib])
 
+PKG_CHECK_EXISTS([libudev], [pkg_config_libudev=yes], [pkg_config_libudev=no])
+if test "x$pkg_config_libudev" = xyes; then
+	PKG_CHECK_MODULES([LIBUDEV], [libudev])
+	AC_DEFINE([HAVE_LIBUDEV], [1], [Define to 1 if libudev is available])
+else
+	AC_MSG_CHECKING([for LIBUDEV])
+	AC_MSG_RESULT([no])
+fi
+
 AC_ARG_ENABLE([zstd],
 	AS_HELP_STRING([--disable-zstd], [build without zstd support]),
 	[], [enable_zstd=yes]
-- 
2.25.1

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