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README
mold ________________________________________________________________________________ mold is a multi-threaded, high-performance linker that is several times faster than the industry-standard ones, namely, GNU ld, GNU gold or LLVM lld. It is developed as a drop-in replacement for these linkers and command-line compatible with them with a few exceptions. [0] Upstream: $/rui314/mold [000] Index ________________________________________________________________________________ * Installation ........................................................... [001] * Setup .................................................................. [002] * METHOD 1 (Compiler-agnostic) ......................................... [003] * METHOD 2 (Clang >= 12.0) ............................................. [004] * METHOD 3 (GCC) ....................................................... [005] * Usage .................................................................. [006] * Troubleshooting ........................................................ [007] * Package Fails To Link With Mold ...................................... [008] * References ............................................................. [009] [001] Installation ________________________________________________________________________________ +------------------------------------------------------------------------------+ | | | $ kiss b mold | | | +------------------------------------------------------------------------------+ [002] Setup ________________________________________________________________________________ To use mold as the system linker one of the following methods must be used. The first solution is recommended as it removes all possibility of the prior linker being executed by mistake. --[003] METHOD 1 (Compiler-agnostic) ------------------------------------------- Use the alternatives system to set mold as the system linker. +----------------------------------------------------------------------------+ | | | $ kiss a mold /usr/bin/ld | | | +----------------------------------------------------------------------------+ --[004] METHOD 2 (Clang >= 12.0) ----------------------------------------------- Add --ld-path to CFLAGS/CXXFLAGS. +----------------------------------------------------------------------------+ | | | $ export CFLAGS="$CFLAGS --ld-path=/usr/bin/mold" | | $ export CXXFLAGS="$CXXFLAGS --ld-path=/usr/bin/mold" | | | +----------------------------------------------------------------------------+ In addition to --ld-path, the following may also be needed. Please NOTE the implications of this warning suppression and why METHOD 1 may be the best solution to this problem. +----------------------------------------------------------------------------+ | | | $ export CFLAGS="$CFLAGS -Wno-unused-command-line-argument" | | $ export CXXFLAGS="$CXXFLAGS -Wno-unused-command-line-argument" | | | +----------------------------------------------------------------------------+ --[005] METHOD 3 (GCC) --------------------------------------------------------- Add -B to CFLAGS/CXXFLAGS (GCC) +----------------------------------------------------------------------------+ | | | $ export CFLAGS="$CFLAGS -B/usr/lib/mold" | | $ export CXXFLAGS="$CXXFLAGS -B/usr/lib/mold" | | | +----------------------------------------------------------------------------+ [006] Usage ________________________________________________________________________________ Mold does not yet support all use cases. It can not be used to link the Linux kernel (due to lack of linker script support) and It has no support for LTO (Link Time Optimization). With mold as the default linker, running the package manager as normal should result in its usage. To verify that mold is being used, disable binary stripping (KISS_STRIP=0) and run the following command on a newly built executable. +------------------------------------------------------------------------------+ | | | $ readelf -p .comment /path/to/exe | | | +------------------------------------------------------------------------------+ If 'mold' appears in the output, everything is setup correctly. [007] Troubleshooting ________________________________________________________________________________ --[008] Package Fails To Link With Mold ---------------------------------------- If a package in the official repositories fails to link with mold, open an issue. If a package in a third-party repository fails to link with mold, open an issue in their tracker. If a package you maintain fails to link (and the issue is in the linker), open an issue upstream. [009] References ________________________________________________________________________________ [0] $/rui314/mold