[LLVMbugs] [Bug 14755] New: clang driver passes inappropriate options to gcc -x assembler

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14755

             Bug #: 14755
           Summary: clang driver passes inappropriate options to gcc -x
                    assembler
           Product: clang
           Version: 3.2
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: supercilious.dude at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


On windows (mingw), a clang 3.2 build does not call as from binutils directly
to assemble code, it calls gcc -x assembler instead. Normally, thats fine, and
trivial test cases compile OK, but when clang is invoked with an option that
GCC does not understand, like -Weverything clang still passes it to gcc,
causing:

i686-w64-mingw32-g++.exe: error: unrecognized command line option
'-Weverything'
clang++: error: assembler (via gcc) command failed with exit code 1 (use -v to
see invocation)

I wasnt able to figure out how to get clang to use as or i686-w64-mingw32-as
directly, but adding:

      if (isa<AssembleJobAction>(JA) &&
          A->getOption().matches(options::OPT_W_Group))
        continue;

to the option check in gcc::Common::ConstructJob() in
clang/lib/Driver/Tools.cpp did the trick, and no warning options are passed.
Hopefully someone more knowledgeable about clang internals can make a better
change like the integrated assembler or at least using as.exe directly instead.

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