Warnings in tests

[ViralBShah]

I see these errors and warnings when doing make test-reflection. The error sounds scary, but the tests do not fail.

The following 'Returned code...' warnings indicate normal behavior:
Warning: Returned code may not match what actually runs.
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
Warning: Returned code may not match what actually runs.
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
error: failed to compute relocation: X86_64_RELOC_UNSIGNED
Warning: Returned code may not match what actually runs.
Warning: Returned code may not match what actually runs.

[tkelman]

see #9521, cc @timholy on that one

on the same issue title, we also have: #9518 (comment) when you do make testall1

and some Windows-only bash.exe: warning: could not find /tmp, please create! that I should probably try to figure out how to suppress on appveyor fixed

[vtjnash]

are you using LLVM3.5+ on a Mac? if so, those warnings are due to an upstream issue that Keno knows how to fix with reading MachO debug info reloc tables. the net result for now is that the line numbers are missing in backtraces.

[ViralBShah]

Yes, I am using LLVM 3.5. I had forgotten that I had a Make.user that used the newer LLVM.

[ViralBShah]

Please close this if there is already an issue about this.

[tkelman]

#7910, right? just the extra-long warnings because of it are new