Description

LLD, the LLVM linker, does not support s390x architecture. As a result, it is necessary to link using BFD or Gold, the GNU linkers. If you don't pass any -fuse-ld= flags to Clang, it assumes BFD. However, if you only have BFD for the target architecture (i.e. s390x-linux-gnu-ld without ld, then our linker detection fails:

will error out with:

clang-16: error: unable to execute command: Executable "ld" doesn't exist!
clang-16: error: linker command failed with exit code 1 (use -v to see invocation)

Which, in our logic, causes the final else() block to apply, setting LD_OSX:

Later, this value is used to determine command line flags passed to the linker:

BFD does not support the OSX -exported_symbols_list, syntax, it needs to be passed with the --version-script= syntax from the earlier if block:

  /usr/local/bin/s390x-linux-gnu-ld:/home/directhex/Projects/runtime/artifacts/obj/linux-s390x.Release/fxr/standalone/hostfxr.exports: file format not recognized; treating as linker script
  /usr/local/bin/s390x-linux-gnu-ld:/home/directhex/Projects/runtime/artifacts/obj/linux-s390x.Release/fxr/standalone/hostfxr.exports:1: syntax error

This problem can be worked around by adding a valid --target=<triple> flag to the -Wl,--version call in configuretools.cmake (which adds the triple prefix to the forked ld command), but with the twisty nesting of imports, it's not clear to me yet how to get the triple into that file.