[llvm-bugs] [Bug 42894] New: FreeBSD needs -pthread link flag for dynamic ASan tests

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42894

            Bug ID: 42894
           Summary: FreeBSD needs -pthread link flag for dynamic ASan
                    tests
           Product: new-bugs
           Version: 9.0
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

When running the dynamic ASan tests on FreeBSD amd64, most of them will fail
with an error similar to:

==7913==AddressSanitizer CHECK failed: compiler-rt/lib/asan/asan_posix.cc:49
"((0)) == ((pthread_key_create(&tsd_key, destructor)))" (0x0, 0x4e)

This is because due to the dynamic linking order, the main executable will have
pthread stubs instead of the "full" pthread functions, leading to the above
error.  This can be worked around by explicitly adding -pthread or -lpthread to
the linker flags for the executables for the dynamic ASan tests.

Review with patch posted here: https://reviews.llvm.org/D39254

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