How to use the gcc installed in macports?

问题

I installed gcc 4.6. from macports (for support of C++0x). But when I check the 'gcc --version` it is showing older version. How to use the newer gcc installed by macports?

回答1:

I remember it being something like g++-mp-4.6. I believe it's enough to set the environment variable CXX to that.

回答2:

You can control the symlink in /opt/local/bin/gcc by using port select. You can see available version using port select --list gcc. Anything listed with mp- as prefix refers to MacPorts' own port, gcc42 and llvm-gcc42 refer to the compilers shipped with Xcode by Apple.

Example from my system:

$ port select --list gcc
Available versions for gcc:
    gcc42
    llvm-gcc42
    mp-gcc45
    none (active)
$ sudo port select --set gcc mp-gcc45
Password:
Selecting 'mp-gcc45' for 'gcc' succeeded. 'mp-gcc45' is now active.

After that, either open a new terminal window or issue hash -r to make bash recognize the change.

回答3:

Just make sure macports' path comes first in your $PATH. Or use gcc-mp-4.6 or something like that.

来源：https://stackoverflow.com/questions/8361002/how-to-use-the-gcc-installed-in-macports