osx - Why Macports does not show the apple xcode compiler through "port select gcc"? -

recently updated mac's xcode , command line tools version 6.4 (i'm running on osx yosemite 10.10.5). after did change, install new package macports, forced run "port selfupdate". however, after did that, broke in system. particularly, usual port select gcc not display apple compilers installed xcode. displays:

available versions gcc: mp-gcc48 none (active) 

i have that, trying solve compilation problem (that's how found out issue), uninstalled 1 or 2 mp-gcc versions. however, remember apple versions should have been listed there.

to make sure apple compilers installed: running command xcode-select --install displays following:

xcode-select: error: command line tools installed, use "software update" install updates

and xcode-select -p displays following:

/applications/xcode.app/contents/developer

so, compilers there. ~/.profile file contains following line:

macports installer addition on 2013-05-13_at_00:53:37: adding appropriate path variable use macports. export path=/opt/local/bin:/opt/local/sbin:$pat 

but, indeed, that's usual change made macports.

does knows happening? need work apple compiler without destroying macports environment.

thanks in advance!

edit: nice answers, indeed none system's (xcode) installation macport. record, tried select macports gcc , none, see if there broken link , indeed happened:

sudo port select gcc mp-gcc48 selecting 'mp-gcc48' 'gcc' failed: symlink: /opt/local/etc/select/gcc/current -> mp-gcc48: file exists 

after manually deleted /opt/local/etc/select/gcc/current, port select gcc command worked , setting sudo port select gcc none worked after that.

the port select gives option select macports compiler command gcc, or sudo port select gcc none, uses system compiler.

i.e., option looking called "none". makes sense, since macports cannot know system compiler is, or if 1 installed. may clang or gcc depending on version of xcode. note on newer versions of xcode/osx, there no gcc, clang, , gcc/g++ links clang/clang++.

edit: same available "port groups". example on system following configuration active:

port select --summary  name       selected     options ====       ========     ======= clang      none         mp-clang-3.7 none cython     cython34     cython27 cython34 none db         none         db46 db48 none gcc        none         mp-gcc47 mp-gcc49 mp-gcc5 none ipython    ipython34    ipython27 ipython34 none llvm       none         mp-llvm-3.5 mp-llvm-3.7 none mysql      none         mysql56 none nosetests  none         nosetests27 nosetests34 none pip        pip34        pip34 none python     python34     python26-apple python27 python27-apple python34 none python2    python27     python26-apple python27 python27-apple none python3    none         python34 none sphinx     py34-sphinx  py27-sphinx py34-sphinx none wxwidgets  none         wxwidgets-3.0 none 

for instance, if want switch system default python, say

sudo port select python none 

and python3 (for there no system default),

sudo port select python3 none