[llvm-bugs] [Bug 45769] New: lld fails to find math symbols like __exp_finite under certain conditions

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45769

            Bug ID: 45769
           Summary: lld fails to find math symbols like __exp_finite under
                    certain conditions
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: moritz at bunkus.org
                CC: llvm-bugs at lists.llvm.org, smithp352 at googlemail.com

My OS & clang version: clang & lld 10.0.0 on Arch Linux (fully updated system
as of 2020-05-01 09:00 CEST); clang & lld are Arch Linux's packages

This is similar to #45034. Here's how to reproduce:

1. Install the Ogg & Vorbis libraries

2. Create the following short test.cpp file:

#include <vorbis/codec.h>
int main(int argc,char **argv)
{
  vorbis_info m_vi;
  vorbis_info_init(&m_vi);

  return 0;
}

3. Try to compile & link with lld & observe errors:

[0 mosu at sweet-chili ~/tmp] clang++ -fuse-ld=lld -o test test.cpp -lvorbis -logg
ld.lld: error:
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../lib64/libvorbis.so:
undefined reference to __acosf_finite
ld.lld: error:
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../lib64/libvorbis.so:
undefined reference to __exp_finite
ld.lld: error:
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../lib64/libvorbis.so:
undefined reference to __pow_finite
ld.lld: error:
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../lib64/libvorbis.so:
undefined reference to __log_finite
clang-10: error: linker command failed with exit code 1 (use -v to see
invocation)
[1 mosu at sweet-chili ~/tmp]



Interesting observations:

1. Compiling & linking works fine if I omit "-logg":

[0 mosu at sweet-chili ~/tmp] clang++ -fuse-ld=lld -o test test.cpp -lvorbis
[0 mosu at sweet-chili ~/tmp]

2. Compiling & linking works fine with GNU ld even with "-logg":

[0 mosu at sweet-chili ~/tmp] clang++ -o test test.cpp -lvorbis -logg
[0 mosu at sweet-chili ~/tmp]

3. Explicitly adding "-lm" on top of "-lvorbis -logg" does not change the
output; it fails the same way.

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