[LLVMbugs] [Bug 18211] New: -fsanitize=undefined links parts of libsanitizer into DSOs on Linux

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18211

            Bug ID: 18211
           Summary: -fsanitize=undefined links parts of libsanitizer into
                    DSOs on Linux
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Keywords: Sanitizer
          Severity: normal
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: glider at google.com
                CC: eugeni.stepanov at gmail.com, kcc at google.com,
                    llvmbugs at cs.uiuc.edu, nlewycky at google.com
    Classification: Unclassified

$ cat t.c
int foo() { return 2; }
$ cat a.c
extern int foo();
int main() {  return foo(); }

$ TOOLS="-fsanitize=address -fsanitize=undefined"
$ clang t.c -shared -o t.so  -fPIC $TOOLS
$ clang a.c  -o a t.so $TOOLS
/usr/bin/ld: a: hidden symbol `pthread_self2' in
/usr/local/google/asan/llvm/llvm_cmake_build/bin/../lib/clang/3.5/lib/linux/libclang_rt.asan-x86_64.a(sanitizer_linux.cc.o)
is referenced by DSO
/usr/bin/ld: final link failed: Bad value
clang-3.4: error: linker command failed with exit code 1 (use -v to see
invocation)

If TOOLS is set to either "-fsanitize=address" or "-fsanitize=undefined" the
linking succeeds.

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