[llvm-commits] [patch] Try to find clang if gcc is not found

[Marc-Antoine Ruel]

Note that I initially attached the diff to a bug at
http://llvm.org/bugs/show_bug.cgi?id=11278 but a colleague recommended to
me to send it to this list;

---

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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