[llvm-bugs] [Bug 42463] New: Sanitizer-x86_64-Test-Nolibc doesn't link in Linux/i686 build

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42463

            Bug ID: 42463
           Summary: Sanitizer-x86_64-Test-Nolibc doesn't link in
                    Linux/i686 build
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: compiler-rt
          Assignee: unassignedbugs at nondot.org
          Reporter: ro at gcc.gnu.org
                CC: llvm-bugs at lists.llvm.org

[There's no sanitizer_common component, so filing for compiler-rt.  Likewise
filing for unspecified version since there's no trunk.]

When running an LLVM build on a Linux/x86_64 system for target
i686-pc-linux-gnu,
make check-all FAILs:

[42/849] Generating Sanitizer-x86_64-Test-Nolibc
FAILED:
projects/compiler-rt/lib/sanitizer_common/tests/Sanitizer-x86_64-Test-Nolibc
cd
/var/gcc/llvm/dist-i686-release/projects/compiler-rt/lib/sanitizer_common/tests
&& /var/gcc/llvm/dist-i686-release/./bin/clang
sanitizer_nolibc_test_main.x86_64.o -Wl,-whole-archive
libRTSanitizerCommon.test.nolibc.x86_64.a -Wl,-no-whole-archive -o
/var/gcc/llvm/dist-i686-release/projects/compiler-rt/lib/sanitizer_common/tests/./Sanitizer-x86_64-Test-Nolibc
-Wl,-allow-shlib-undefined -nostdlib -m64
/usr/bin/ld: i386 architecture of input file
`sanitizer_nolibc_test_main.x86_64.o' is incompatible with i386:x86-64 output
/usr/bin/ld: sanitizer_nolibc_test_main.x86_64.o: in function `_start':
/vol/llvm/src/compiler-rt/dist/lib/sanitizer_common/tests/sanitizer_nolibc_test_main.cc:17:
undefined reference to `_GLOBAL_OFFSET_TABLE_'
/usr/bin/ld: sanitizer_nolibc_test_main.x86_64.o: file class ELFCLASS32
incompatible with ELFCLASS64
/usr/bin/ld: final link failed: file in wrong format
clang-9: error: linker command failed with exit code 1 (use -v to see
invocation)

The object in question (sanitizer_nolibc_test_main.x86_64.o) is build for the
default multilib (-m32), but the rest of the archive is 64-bit as it should.

The attached hack (forcing -m64) allowed the build to continue for me.

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