Change Details

This is useful in downstream toolchain builds that only support a single output format. For example, the FreeBSD lld build has a local patch to only include ELF support in lld.cpp. This change will allow removing the downstream patch and instead use the relevant LLD_ENABLE_*_LINKER defines.

This is useful in downstream toolchain builds that only support a single (or maybe two) output formats. For CHERI LLVM, most users compile the toolchain from source, so disabling the non-ELF linkers reduces build time (about 100 C++ source files fewer to compile) and reduces the lld binary size by about 4MB (106MB -> 102MB) for a statically linked build. Another example where this can be useful is the FreeBSD lld build, which has a local patch to only include ELF support in lld.cpp. This change will allow removing the downstream patch and instead use the relevant LLD_ENABLE_*_LINKER defines. This patch should not result in any long-term maintainance issues, as it only adds a few if() lines to the CMake build and skips tests for some subdirectories.

This is useful in downstream toolchain builds that only support a single (or maybe two) output formats. For exampleCHERI LLVM, the FreeBSD lld build has a local patch tomost users compile only include ELF support in lld.cpp.the toolchain from source, This change will allow removingso disabling the non-ELF linkers reduces the downstream patch and instead use the relevant LLD_ENABLE_*_LINKERbuild time (about 100 C++ source files fewer to compile) and reduces definthe lld binary size by about 4MB (106MB -> 102MB) for a statically linked build. Another example where this can be useful is the FreeBSD lld build, which has a local patch to only include ELF support in lld.cpp. This change will allow removing the downstream patch and instead use the relevant LLD_ENABLE_*_LINKER defines. This patch should not result in any long-term maintainance issues, as it only adds a few if() lines to the CMake build and skips tests for some subdirectories.