问题
I just installed gcc 4.9 (with C11 support), and want to add it to Xcode 4.6.3's build options as a compiler option. I ran make and make install, and the packages are all there (under /usr/bin/gcc. Running gcc --version confirms that gcc 4.9 is installed rather than an older version.
When I go into an existing Xcode project's build settings, the only compiler options available are
Apple LLVM compiler 4.2
LLVM GCC 4.2
Other...
Clearly, GCC 4.9 would have to be added using the "Other..." option, although I'm not sure how. I've tried inputting the path to gcc (/usr/bin/gcc), although the default value for other isn't a path at all: com.apple.compilers.llvmgcc42.
I've also tried following the instructions from the answer to this question as well, but the machine I'm on doesn't have the /Developer directory at all, since I believe Apple integrated the developer tools that required (and created) this directory into Xcode.
How do I add gcc 4.9 as a compiler option in Xcode?
来源：https://stackoverflow.com/questions/17289216/adding-gcc-4-9-as-a-compiler-option-in-xcode