If you're trying to use Travis to get as diverse a build matrix as possible, here's one thing to watch out for. A Travis config like:
language: c compiler: gcc os: osxhas an interesting detail in the output:
$ gcc --version Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1 Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn) Target: x86_64-apple-darwin13.4.0 Thread model: posix
Huh? Although we asked for gcc, we're getting something that looks like LLVM! Issue 2423 has the down-low, which is basically that by default OS X has a gcc binary that's a front-end for LLVM. That issue also has the work-around, which is to export CC=gcc-4.8.
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