[LLVMbugs] [Bug 11278] New: Make llvm-ld fallback to clang when gcc is not found

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11278

             Bug #: 11278
           Summary: Make llvm-ld fallback to clang when gcc is not found
           Product: tools
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-ld
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: maruel at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 7559
  --> http://llvm.org/bugs/attachment.cgi?id=7559
Try to find clang if gcc is not found

Repro:
- On a system without gcc installed (like Windows):
- Build llvm+clang with MSVS2010. I used MinSizeRel configuration but it
shouldn't matter.
- Add ...\build\bin\MinSizeRel to PATH to make sure all llvm tools and clang
are in PATH.
- echo int main() { return 0; } > hello.c
- clang -c hello.c -emit-llvm -o hello.bc
- llc -filetype=obj hello.bc
- llvm-ld hello.obj -o=hello.ld.exe -native

Result:
llvm-ld: Failed to find gcc

Expected:
Uses clang.

Notes:
I kept the behavior to try to find gcc first and only fallback to clang if gcc
is not found to reduce the side-effects of this patch.

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