在Mac（Yosemite）上安装了哪个版本的gcc

Question

我很困惑我的Mac上安装了哪个版本的gcc，其上安装了OS X Yosemite（10.10.5）。我也安装了Xcode v6.3.1。

输入以下命令可显示以下信息：

gcc -v
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/c++/4.2.1
Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

clang -v
Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

which gcc
/usr/bin/gcc

which clang
/usr/bin/clang

据我所知，gcc没有别名的铿锵声。

有人可以告诉我这意味着什么吗？

Answer 1

在较新版本的XCode中，gcc和clang链接到SDK中的相同二进制文件。 clang会说它至少是gcc 4.2，这有点奇怪，但适用于许多检查gcc的软件，并且它通常是兼容的。

echristo@dzur ~> /usr/bin/clang -v
Apple LLVM version 7.3.0 (clang-703.0.31)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
echristo@dzur ~> /usr/bin/gcc -v
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/include/c++/4.2.1
Apple LLVM version 7.3.0 (clang-703.0.31)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

如果您查看InstalledDir目录，您可以看到实际存在的程序。

Answer 2

I had a similar problem, I wanted to know what version of gcc should I install on my Yosemite, since most of UNIX tools need GCC it is a vital package.

if gcc -version doesn't shows the version, it means you do not have one.

you need to install a gcc first, then check for its version! funny? but according to your Xcode command line and OS version you have not a lot of options, let the brew decide which version you should install, It also installs dependencies.

To install GCC,

1. install Homebrew From HomeBrew Website
2. Open Terminal
3. Run command: brew install gcc

I have installed my GCC just now, here is the snapshot, notice the dependent module names and the gcc version at the following picture, they are Yosemite tailored :