[llvm-bugs] [Bug 30345] New: lld shared libraries build is broken on MacOS (and probably has been for a while)

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30345

            Bug ID: 30345
           Summary: lld shared libraries build is broken on MacOS (and
                    probably has been for a while)
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: MachO
          Assignee: unassignedbugs at nondot.org
          Reporter: davide at freebsd.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

While trying the MachO lld I saw some tests failing with BUILD_SHARED_LIBS,
e.g.:

******************** TEST 'lld :: mach-o/linker-as-ld.yaml' FAILED
********************


The reason is that dyld gets confused and can't find the library:

dyld: Library not loaded: @rpath/liblldDriver.dylib
  Referenced from:
/Users/davide/work/llvm/build-shared/tools/lld/test/mach-o/Output/linker-as-ld.yaml.tmp.dir/ld
  Reason: image not found

$ otool -L
/Users/davide/work/llvm/build-shared/tools/lld/test/mach-o/Output/linker-as-ld.yaml.tmp.dir/lld
/Users/davide/work/llvm/build-shared/tools/lld/test/mach-o/Output/linker-as-ld.yaml.tmp.dir/lld:
@rpath/liblldDriver.dylib (compatibility version 0.0.0, current version 0.0.0)
@rpath/liblldCOFF.dylib (compatibility version 0.0.0, current version 0.0.0)
@rpath/liblldELF.dylib (compatibility version 0.0.0, current version 0.0.0)
@rpath/libLLVMSupport.dylib (compatibility version 0.0.0, current version
0.0.0)
/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 120.1.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version
1226.10.1)

Apparently, just moving the built lld to the parent directory (../) will cause
the same problem. I suspected it was rpath related and actually forcing rpath
to the absolute correct value (via install_name_tool) seems to work around the
problem.

I think this should be fixed in the build system, anyway (and maybe a bot
should be set up to catch up these kind of failures).

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