[LLVMbugs] [Bug 16272] New: Using wrong compiler when linking Lsan-x86_64-Test (and maybe elsewhere)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16272

            Bug ID: 16272
           Summary: Using wrong compiler when linking Lsan-x86_64-Test
                    (and maybe elsewhere)
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: compiler-rt
          Assignee: unassignedbugs at nondot.org
          Reporter: andyg1001 at hotmail.co.uk
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

When compiling compiler-rt using cmake, the just-built version of clang is used
to compile source files (e.g. lsan_dummy_unittest.cc.x86_64.o), but when it
comes to linking (e.g. Lsan-x86_64-Test), the compiler used for linking is the
system one.

On my system, this causes the build to fail on linking Lsan-x86_64-Test with
"undefined reference to `std::ios_base::Init::Init()'" since the source file is
compiled against libstdc++11 but being linked against libc++11.

I expect there is a simple solution, i.e. to ensure that the same compiler is
used for compiling and for linking, but I am not familiar with compiler-rt so
can't provide a fix myself.

I also don't know whether this problem occurs elsewhere -- it may just be
fortunate that the conflict arises here!

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