Revisions of mold
Ana Guerrero (anag+factory)
accepted
request 1205736
from
Martin Liška (martinliska)
(revision 48)
- Update to version 2.34.1 * [ARM32] Fixed a regression that R_ARM_TARGET1 wasn't handled as a synonym for R_ARM_ABS32 relocation. This issue caused some ARM32 programs to crash on startup if linked with mold. (186272a) * [RISC-V] mold now sets the STO_RISCV_VARIANT_CC dynamic tag if the ELF module exports a function symbol with a non-standard calling convention. (16eb513)
Ana Guerrero (anag+factory)
accepted
request 1203610
from
Martin Liška (martinliska)
(revision 47)
- Update to version 2.34.0 * [ARM32] mold now deduplicates exception handling records in a .ARM.exidx section to reduce the size of the table. (742ea87) * [LoongArch] TLSDESC relocations are now supported. (dbaa6d7) * --build-id=fast is now supported for compatibility with LLVM lld. mold handles it as a synonym for --build-id=sha256. (afc52ee) * Previously, if the same symbol was provided both by a static archive and dynamic library, and if the symbol's visibility was hidden, mold sometimes failed to link it and handled the symbol as if it were undefined. Now, mold can correctly link such programs. (1efbe3f) * Under rare circumstances, mold could create corrupted binaries if they were linked with --retain-symbols-file. This bug has been fixed. (0ee12e4) * [LoongArch] R_LARCH_CALL36 relocation with a large offset is now correctly written. (1c32102) * [FreeBSD] If all thread-local variables in a program have no initial values, mold-produced executables could crash or misbehave on FreeBSD. This bug has been fixed. (f6822fb) * DEC Alpha support has been removed due to lack of demand. In fact, mold's Alpha support has never been tested for real-world programs and was likely unable to link them in the first place. This should not affect anyone because the last Alpha processor was released more than 20 years ago. (3711ddb)
Dominique Leuenberger (dimstar_suse)
accepted
request 1192095
from
Martin Liška (martinliska)
(revision 46)
- Update to version 2.33.0 * mold gained a new linker flag --separate-debug-info to bundle debug info sections into a separate file instead of putting them into a main output file. You can optionally specify a filename in the form of --separate-debug-info=<filename>. By default, a debug info file is created in the same directory as the main output file with the .dbg extension. mold embeds the debug file's filename into the main output file so that gdb can automatically follow the link to find debug info when debugging the main output file. * The main objective of this flag is to speed up the mold linker even more. By default, mold creates a separate debug file in the background after creating a main output file, so that you can start running the executable as soon as possible while mold is still working on linking its debug info sections. For example, linking clang with debug info normally takes ~1.70s on a Threadripper 7980X machine, while it takes only ~0.52s with --separate-debug-info. Shaving off a full second in quick edit-rebuild-run cycles should improve programmers' productivity. If you do not want mold to work in the background, pass the --no-detach option. (596ffa9) * mold now supports the --no-allow-shlib-undefined flag. If the option is given, mold checks if all undefined symbols are resolved not only for input object files but also for shared libraries passed to the linker. To use the feature, you need to pass all shared libraries, including transitively dependent ones, to the linker so that the linker can resolve all symbols that are available at runtime. (3001f02) * mold gained the --dynamic-list-data flag for the sake of compatibility with GNU ld. If the flag is given, all data symbols are exported as dynamic symbols. (dd8d971) * [x86-64] -z x86-64-v2, -z x86-64-v3, -z x86-64-v4 flags are supported. (5606087) * [x86-64] Recent x86-64 processors support Intel CET to protect control flow integrity. When the feature is enabled, the instruction that is executed
Ana Guerrero (anag+factory)
accepted
request 1185859
from
Factory Maintainer (factory-maintainer)
(revision 45)
Automatic submission by obs-autosubmit
Ana Guerrero (anag+factory)
accepted
request 1183534
from
Martin Liška (martinliska)
(revision 44)
- Update to version 2.32.0 * Previously, shared libraries specified with --as-needed were not considered as "needed" if they were referenced only by weak undefined symbols. Such weak symbols were converted to absolute symbols at address zero at link-time. Although this behavior was not technically wrong, it caused a significant issue in a rare occasion (#1286). Now, weak undefined symbols retain --as-needed shared libraries. (06b5926) * [RISC-V] RISC-V object files contain ISA strings in the .riscv.attributes section. Previously, we had reported valid ISA strings containing digits as errors. The issue has now been resolved. (841a186) * [RISC-V] We no longer write dynamic relocation addends to relocated places because it caused static position-independent executables to crash on process startup in some environments. In other words, --no-apply-dynamic-relocs is enabled by default. * LTO now works on MinGW. (50bf031)
Ana Guerrero (anag+factory)
accepted
request 1179562
from
Martin Liška (martinliska)
(revision 43)
- Update to version 2.32.0 * mold supports a feature called Identical Code Folding, or ICF. As the name suggests, ICF finds identical functions and merges them to reduce the size of an output file. This is especially effective for template-heavy C++ programs since templates tend to be instantiated to the same machine code for different types. For example, std::vector<int> is likely to be instantiated to the same code as std::vector<unsigned>. We've made an improvement to our ICF algorithm so that the --icf feature is ~50% faster than the previous version. (fa8e95a) * The -z rodynamic option is now supported for compatibility with LLVM lld. With the option, mold places the .dynamic section into a read-only segment. (9a233df) * Previously, mold behaved differently compared to other linkers if both -z defs and --undefined=ignore-in-object-files were given (#1270). Now, they override each other so that the mold's behavior is compatible with others. (8cd85aa) * Previously, --dependency-file mistakenly recorded response files as dependencies (#1258). This bug has been fixed. (4281f45) * There was a bug that mold corrupted debug info section contents when the --relocatable option was given (#1265). This issue has been fixed. (08b0a16) * [PPC64] The R_PPC64_TPREL16_LO_DS relocation type is supported. (a8cd2e8) * [ARM64, PPC64, LoongArch] mold 2.31.0 or earlier may have failed with an assertion failure when creating a large output file (#1224). This issue has been resolved. (c7c8583)
Ana Guerrero (anag+factory)
accepted
request 1171501
from
Martin Liška (martinliska)
(revision 42)
- Update to version 2.31.0 * mold is now up to 10% faster when linking very large, debug info-enabled executables such as Blender (~1.8 GiB) or Clang (~3.8 GiB), thanks to several improvements we've made to the string merging algorithm. (53ebcd8, d714301, 40f6b17, c9faf3d) * -z start-stop-visibility=hidden is now supported so that linker-synthesized __start_<section-name> and __stop_<section-name> symbols can be completely hidden from other ELF modules. Previously, only -z start-stop-visibility=protected was supported. (99a5b15) * -Bsymbolic-non-weak and -Bsymbolic-non-weak-functions options are now supported for compatibility with LLVM lld. Just like lld, these options control which symbols are exported as dynamic symbols. -Bsymbolic-non-weak makes the linker to export only weak symbols, whereas -Bsymbolic-non-weak-functions makes it to export only weak function symbols. (7d17aa8) * Previously, if a linker script contains a newline character in the beginning four bytes of a file, it was not recognized as a linker script by mold. Now, mold allows newlines at the beginning of a file. (ea054cc) * Under rare circumstances, the INPUT linker script command may have found a different file than GNU ld would. Now, mold's behavior aligns with GNU ld's. (163975d) * Previously, the --repro option produced corrupted tar files. Now the bug has been fixed. (32c4a09) * mold generally guarantees that its output is reproducible, meaning that if you run the linker with the exact same command line options and input files, the output is guaranteed to be bit-for-bit identical to the previous outputs. However, under rare circumstances, it might produce different output due to a bug. It's reported that this nondeterminism caused random crashes for some programs (#1247). This bug has been fixed. (6463a7c) * mold no longer sets the address of the .text section as the entry point address if --entry option is not given, just like LLVM lld. (020b1a7)
Ana Guerrero (anag+factory)
accepted
request 1158643
from
Martin Liška (martinliska)
(revision 41)
- Update to version 2.30.0 * We have increased the version number from 2.4.1 to 2.30.0, even though this release contains only minor bug fixes. This change was made to prevent GNU libtool from mistaking mold 2.4.1 for GNU ld 2.4.1, which led it to incorrectly conclude that our linker was an outdated version of the GNU linker. Bumping up the version number to align with GNU ld may not be the most elegant solution, but it is a practical approach to resolve the compatibility issue with GNU libtool. (c7f6a91) * Previously, mold may have inserted an unnecessary gap before the .bss section in an output file, thereby creating an extra segment for it. While not technically incorrect, it was certainly unnecessary. mold 2.30.0 eliminates this unnecessary on-disk gap for .bss. (c395da1) * Previously, under rare circumstances, mold might fail with the "ConcurrentMap is full" error message if --gdb-index was used. This bug has been resolved. (c60d1d0) * Previously, mold might generate an excessive number of "ignoring .llvm_addrsig section without sh_link" warnings. These warnings are now suppressed. (51f871f) * Sections with unknown section types are now reported as errors. (d21207c) * [PPC32] A crash bug related to --gc-sections has been fixed. (8eae0a3)
Dominique Leuenberger (dimstar_suse)
accepted
request 1154127
from
Martin Liška (martinliska)
(revision 40)
- Align path for document installation between openSUSE versions. - Update to version 2.4.1 * mold 2.4.0 or prior may promote weak dynamic symbols to strong ones under a rare circumstance, which caused "undefined symbol" error at runtime. The bug has been fixed. (50bdf39) * Previously, if two or more VERSION clauses in a version script match to the same symbol, the first one took precedence. This was incompatible with GNU ld, which gives the last one the highest priority, causing a Qt library link failure. This compatibility issue has been resolved. (e1e16bf) * By default, we demangle symbols in error messages so that they are easier to read. Previously, Rust symbols could accidentally be demangled as C++ symbols. Now, mold attempts to demangle symbols as Rust ones only for object files created by rustc. (ea9864b) * [RISC-V] mold now relaxes a GOT-load instruction sequence into a direct address materialization if the symbol address is known at link time. This relaxation eliminates one memory load and slightly improves the linked program's performance. (2ccaa81) * [PowerPC64 ELFv2] GCC may emit references to _savegpr0_*, _restgpr0_*, _savegpr1_* and _restgpr1_* symbols for the -Os command line option to optimize the output for code size. These symbols are not defined by any object file and expected to be synthesized by the linker. mold didn't use to synthesize these symbols, and therefore object files created with -Os sometimes failed due to missing symbol errors. Now, mold synthesizes these symbols. (d4ff48a) * [PowerPC64] R_PPC64_DTPREL16_LO_DS relocation type has now been supported. (6d8e6af) * [Illumos] On Illumos OS, absolute symbols in DSOs need to be resolved at runtime because the dynamic linker treats such symbols in a special manner. Previously, mold directly used absolute symbol addresses at link-time and did not place them into the dynamic symbol table. That optimization has been removed for
Ana Guerrero (anag+factory)
accepted
request 1129883
from
Martin Liška (marxin)
(revision 39)
- Update to version 2.4.0 * mold gained the --spare-program-headers=<number> option, which adds a specified number of spare entries at the end of the program header. The option aims to make post-processing tools to add program header entries very easily. Note that sorting program header entries after adding new ones may be necessary to meet the constraints of the ELF file format. For details, see the elf(5) man page. (eb6c213) * mold's -z rewrite-endbr option rewrites superflous endbr64 instructions with nop as a countermeasure against control-flow highjacking attacks. Previously, this worked exclusively with object files compiled with -ffunction-sections, requiring each function to be compiled into a separate section. Starting from this release, -z rewrite-endbr works on object files compiled without it. In other words, mold is now capable of rewriting endbr64 instructions even if the instruction is not at the beginning of a section. (3cb8a52) * Previously, mold couldn't handle object files containing multiple .eh_frame sections. The .eh_frame is a section containing data for exception handling. Usually, an object file contains only one .eh_frame which describes how to handle exceptions for all text sections in the same file. However, on rare conditions, it seems ld -r creates an object file containing multiple .eh_frame sections. mold is now able to handle such object files. (f4c5a8a) * mold -run <command> is an easy way to run the given command with a virtual environment in which the ld command is replaced with mold. The feature is implemented using LD_PRELOAD to hook fork(2)-family functions. Before this release, some invocations of ld were not intercepted correctly because we missed the posix_spawnp(2) function. Now, the function is intercepted just like other fork(2)-family functions. (3fd1cec) * mold used to produce a non-working executable on a rare occasion when all thread-local variables lacked an initial value and the read-only data required alignment equal to or greater than the page size. This bug has been resolved. (de7d37e)
Ana Guerrero (anag+factory)
accepted
request 1126103
from
Martin Liška (martinliska)
(revision 38)
- Update to version 2.3.3 * --dynamic-list has different semantics for executables and DSOs. Previously, mold implemented only the semantics for executables, causing issues with libraries such as musl that used this option. mold now handles the option for DSOs correctly. (da3f5dd) * Old object files often contain .ctors and .dtors sections, which hold function pointers for initializing and finalizing processes, respectively. Their roles have been superseded by .init_array and .fini_array on most targets. mold worked functioned correctly as long as input object files consistently use the old or the new sections. However, mixing object files that contain both types of initializers/finalizers resulted in some functions not being executed. This issue has been fixed. (3f88964) * --defsym can cause the linker to crash if a given symbol is not defined. The crash bug has been fixed. (ff3d54d) * [POWER10] On rare occasions, pointers statically initialized to functions could be left as null pointers. This bug has been fixed. (31c3b53) - Remove upstreamed patch power10-fix.patch. - Add power10 fix power10-fix.patch for #1142.
Ana Guerrero (anag+factory)
accepted
request 1123388
from
Martin Liška (martinliska)
(revision 37)
- Update to version 2.3.2 * Remove upstream patch fix-arm.patch. * mold no longer emits dynamic relocations against the text segment for GNU ifunc symbols. Previously, mold emitted such relocations for position-dependent executables. (4cdfc7e) * mold no longer reports the "REL-type relocation table is not supported for this target" error and instead ignore incompatible relocation tables. LLVM generates such non-conforming relocation tables for the .llvm.call-graph-profile section. This change was made for compatibility. (3791900) * mold now pads unused gaps in the text segment with interrupt or NOP instructions, instead of leaving them filled with zeros. This alteration does not change the program's semantics but prevents disassemblers from interpreting the spaces between functions as valid instructions. (c86a59a) * mold now creates the .mold-lock file for MOLD_JOBS not in the home directory but in $XDG_RUNTIME_DIR, which is usually /var/user/<uid>. (39cdf61) * [ARM32] There was an issue preventing mold from being built on an ARMv8 64-bit ARM processor with an ARM32 userland, such as the 32-bit Raspberry Pi OS running on a Raspberry Pi 4. This build issue has been resolved. (02ead29) * [LoongArch] mold can now handle R_LARCH_PCALA_LO12 relocation for the jirl instruction. (d3188e3)
Ana Guerrero (anag+factory)
accepted
request 1120275
from
Martin Liška (martinliska)
(revision 36)
- Add fix-arm.patch in order to fix failing arm-arm_range-extension-thunk2 test.
Ana Guerrero (anag+factory)
accepted
request 1119175
from
Martin Liška (martinliska)
(revision 35)
- Update to version 2.3.1 * [ARM32, ARM64, PowerPC, LoongArch] mold 2.3.0 would crash when handling large output files. This was due to a bug in the code that creates range extension thunks. This issue has now been resolved. (7be1b66) * [LoongArch] mold is now capable of handling relocations generated for the -mcmodel=extreme flag. (4bd80ec)
Ana Guerrero (anag+factory)
accepted
request 1118582
from
Martin Liška (martinliska)
(revision 34)
- Update to version 2.3.0 * [x86-64] mold 2.3.0 has introduced an experimental flag, -z rewrite-endbr, which rewrites superfluous endbr64 instructions as nop. * endbr64 is a relatively recent x86 instruction used to mark locations where an indirect jump instruction can transfer control. With control-flow integrity enabled (meaning endbr64 is effective), an indirect jump can only target an endbr64 or it will trigger a runtime exception. This mechanism significantly hinders certain control hijacking attacks, such as ROP or JOP, since attackers cannot jump to just any location. * When given the -fcf-protection flag, GCC conservatively places an endbr64 at the beginning of every global function. This is because the function's address might be taken as a pointer by other translation units. However, in most cases, function addresses are not actually taken. This conservative approach results in an overabundance of unnecessary endbr64 instructions, leading to not only code bloating but also a potential decrease in security as there are more locations for an attacker to exploit. * The new linker option, -z rewrite-endbr, aims to alleviate this issue. The linker can carry out a whole-program analysis on the input files to identify functions whose addresses are never taken. If -z rewrite-endbr is specified, mold will conduct this analysis and replace the initial endbr64 with a nop for functions whose addresses aren't taken. (17f0d85) * mold now produces a more compact .gdb_index section when using the --gdb-index flag. Additionally, mold now generates a correct .gdb_index section for object files created by Clang. (a396fa4) * mold is now capable of handling input sections larger than 4 GiB. (0ce32d3) * [PPC] mold can now generate executables for POWER10 processors. Previously, executables produced by mold would crash immediately on startup on POWER10. (0f71471) * [ARM64] When a function with a non-standard calling convention is exported, it's mandatory for the linker to turn on the STO_AARCH64_VARIANT_PCS flag to notify
Dominique Leuenberger (dimstar_suse)
accepted
request 1113750
from
Martin Liška (martinliska)
(revision 33)
- Add build-blake-3-as-static.patch that builts BLAKE 3 support as static library into mold. The library is not provided in openSUSE yet. - Update to version 2.2.0 * We now use BLAKE3 as a cryptographic hash function instead of SHA256. This change has made --build-id a few percent faster. libssl is no longer a build dependency. (7f7a744) * mold is now a few percent faster than the previous version due to an optimization of string merging code path. (1a13c50) * mold now emits slightly optimized code for thread-local variable accesses. (f057fda, d56f528) * [RISC-V] mold now supports TLSDESC relocations. TLSDESC is a new mechanism for faster thread-local variable access. We (@ishitatsuyuki) actually led the effort to ratify the specification (riscv-non-isa/riscv-elf-psabi-doc#373) and implement it to compiler toolchain including GCC, GNU binutils and, of course, mold. (141556d) * mold no longer marks an as-needed .so as "needed" if the .so file is not directly used by the output file. Previously, mold marked a .so file as "needed" if the .so file was used by another "needed" .so file. (f02db0f) * [PPC64] --execute-only now works on 64-bit PowerPC. (ac20d87, 51fec5f) - Remove openssl dependency.
Dominique Leuenberger (dimstar_suse)
accepted
request 1103723
from
Martin Liška (marxin)
(revision 32)
- Update to version 2.1.0 * Loongson's LoongArch CPU has been supported. (03b1a1c) * -z nosectionheader has been added to eliminate section headers from the output file. (084ca55) * Previously, linking with the -z pack-relative-relocs option produces an executable that glibc 2.38 refuses to run with DT_RELR without GLIBC_ABI_DT_RELR dependency error. Now, mold produces binaries compatible with glibc 2.38. (f467ad1) * [ARM64] R_AARCH64_ADR_PREL_PG_HI21_NC relocation type has been supported. (17a5c3e) * [ARM64] R_AARCH64_MOVW_UABS_G3 relocation type has now been handled as a PLT-generating relocation to fix an issue when main is not defined in the main executable but rather in a .so file. (e764557) * [RISC-V] We now merge input .riscv.attributes contents. Previously, we just concatenated them. (aa64491)
Ana Guerrero (anag+factory)
accepted
request 1100863
from
Martin Liška (marxin)
(revision 31)
- Update to version 2.0.0 * License changed to MIT. * Previously, mold could not produce an object file with more than 65520 sections using the --relocatable option. Now the bug has been fixed. (2e8bd0b) * mold now interprets -undefined as a synonym for --undefined instead of -u ndefined. This seems inconsistent, as -ufoo is generally treated as -u foo (which is an alias for --undefined foo), but this is the behavior of the GNU linkers and LLVM lld, so we prioritize compatibility over consistency. * -nopie is now handled as a synonym for --no-pie. * [RISC-V] R_RISCV_SET_ULEB128 and R_RISCV_SUB_ULEB128 relocation types are now supported (4bffe26, 1ac5fe7) * [PPC64] R_PPC64_REL32 relocation type is now supported. (ebd780e)
Dominique Leuenberger (dimstar_suse)
accepted
request 1072308
from
Martin Liška (marxin)
(revision 30)
- Update to version 1.11.0 * IBM Power10 has been supported. Previously, mold created broken executables for that target. (5065547) * --hash-style=none has been added to cancel --hash-style=sysv, --hash-style=gnu or --hash-style=both. (ec75633) * [ARM32] R_ARM_PLT32 relocation type has been supported. (e505900) * [RISC-V] R_RISCV_PLT32 relocation type has been supported. (51845ac) * Previous versions of mold failed to link some programs in rare corner cases if Link-Time Optimization (LTO) is enabled. These bugs have been fixed. (e1a7590, 62d6537) * mold used to ignore dependencies between DSOs. Since this version, if a required DSO depends on other as-needed DSO, mold keeps the latter DSO as a required one. This improves compatibility with GNU linkers. (1adde7a) * [x86-64] mold can now link object files generated by old buggy versions of GCC. (d2970e0) * [x86-64] Previously, a program with a very large .bss section may fail to link due to R_X86_64_REX_GOTPCRELX relocation overflow (#975). This bug has been fixed. (627bf7c)
Dominique Leuenberger (dimstar_suse)
accepted
request 1060245
from
Martin Liška (marxin)
(revision 29)
- Update to version 1.10.1 * mold 1.10.0 had a buffer overrun bug that causes the linker to terminate immediately if compiled with -D_GLIBCXX_ASSERTIONS. We fixed the unsafe memory access in this release. (7e65546)
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