[LLVMbugs] [Bug 24038] New: undefined "___atomic_compare_exchange and ___atomic_load emitted at -m32 on x86_64-apple-darwin12

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24038

            Bug ID: 24038
           Summary: undefined "___atomic_compare_exchange and
                    ___atomic_load emitted at -m32 on
                    x86_64-apple-darwin12
           Product: clang
           Version: trunk
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: howarth.mailing.lists at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

When current llvm/clang/compiler-rt/openmp trunk svn is built on
x86_64-apple-darwin12 (OS X 10.8), the resulting compiler produces failures in
the test_omp_atomic and orph_test_omp_atomic tests of the OpenMP3.1_Validation
test suite when it is built at -m32 (but not -m64). The failures are due to
failed linkages of the form...

Testing for "omp_atomic":
Generating sources .............. success
Compiling soures ............Undefined symbols for architecture i386:
  "___atomic_compare_exchange", referenced from:
      _.omp_outlined..4 in test_omp_atomic-a95352.o
      _.omp_outlined..6 in test_omp_atomic-a95352.o
      _.omp_outlined..12 in test_omp_atomic-a95352.o
  "___atomic_load", referenced from:
      _.omp_outlined..4 in test_omp_atomic-a95352.o
      _.omp_outlined..6 in test_omp_atomic-a95352.o
      _.omp_outlined..12 in test_omp_atomic-a95352.o
ld: symbol(s) not found for architecture i386
clang-3.7: error: linker command failed with exit code 1 (use -v to see
invocation)
make[1]: *** [bin/c/test_omp_atomic] Error 1
ERROR: Compilation of the test failed.
.... failed
+ orphaned mode:
Generating sources .............. success
Compiling soures ............Undefined symbols for architecture i386:
  "___atomic_compare_exchange", referenced from:
      _.omp_outlined..12 in orph_test_omp_atomic-f659ef.o
  "___atomic_load", referenced from:
      _.omp_outlined..12 in orph_test_omp_atomic-f659ef.o
ld: symbol(s) not found for architecture i386
clang-3.7: error: linker command failed with exit code 1 (use -v to see
invocation)
make[1]: *** [bin/c/orph_test_omp_atomic] Error 1
ERROR: Compilation of the test failed.

These failures don't occur on 10.9 or later due to their support for the calls
as seem in compiler-rt-3.7.0.src/lib/builtins/apple_versioning.c...

NOT_HERE_IN_10_8_AND_EARLIER(__atomic_compare_exchange)
NOT_HERE_IN_10_8_AND_EARLIER(__atomic_compare_exchange_1)
NOT_HERE_IN_10_8_AND_EARLIER(__atomic_compare_exchange_2)
NOT_HERE_IN_10_8_AND_EARLIER(__atomic_compare_exchange_4)
NOT_HERE_IN_10_8_AND_EARLIER(__atomic_compare_exchange_8)

NOT_HERE_IN_10_8_AND_EARLIER(__atomic_load)
NOT_HERE_IN_10_8_AND_EARLIER(__atomic_load_1)
NOT_HERE_IN_10_8_AND_EARLIER(__atomic_load_2)
NOT_HERE_IN_10_8_AND_EARLIER(__atomic_load_4)
NOT_HERE_IN_10_8_AND_EARLIER(__atomic_load_8)

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