Update GCC on OSX

Question

So I am a new programmer and I just installed XCode on my Macbook to get the GCC  I think Xcode is the only way for getting GCC on OSX  Now when I run my Hello World application  in C    g   comes up saying it is version 4 0 1 but when I look for commands starting with g I also see g  -4 2  Is there any way of making 4 2 default rather than 4 0 1  and also is there a way to updating gcc to the latest version 4 4 0   EDIT  Ok  so I installed macports and installed gcc4 4 and it shows up on terminal as gcc-mp-4 4 and how do I make it default with gcc select  like what are the commands and stuff  Thanks

User · Accepted Answer

If you install macports you can install gcc select, and then choose your gcc version.

/opt/local/bin/port install gcc_select

To see your versions use

port select --list gcc

To select a version use

sudo port select --set gcc gcc40

User · Answer

I know it is an old request  But it might still be useful to some  With current versions of MacPorts  you can choose the default gcc version using the port command  To list the available versions of gcc  use        sudo port select --list gcc  Available versions for gcc  gcc42 llvm-gcc42 mp-gcc46 none  active     To set gcc to the MacPorts version        sudo port select --set gcc mp-gcc46

User · Answer

You can install your GCC manually   either through   sudo port install gcc46   or your download the source code from one of the mirrors from here for example here  tar xzvf gcc-4 6 0 tar gz cd gcc-4 6 0   configure make  well if you have multiple version  then through you can choose one  port select --list gcc   remember port on mac is called macport https   www macports org install php and add add the bin into your path export PATH  PATH  opt local bin

User · Answer

The following recipe using Homebrew worked for me to update to gcc g   4 7     brew tap SynthiNet synthinet   brew install gcc47   Found it on a post here

User · Answer

You can have multiple versions of GCC on your box  to select the one you want to use call it with full path  e g  instead of g   use full path  usr bin g   on command line  depends where your gcc lives    For compiling projects it depends what system do you use  I m not sure about Xcode  I m happy with default atm  but when you use Makefiles you can set GXX  usr bin g   and so on   EDIT  There s now a xcrun script that can be queried to select appropriate version of build tools on mac  Apart from man xcrun I ve googled this explanation about xcode and command line tools which pretty much summarizes how to use it

User · Answer

use  gcc select -l          gcc select -l      gcc40 mp-gcc44          gcc select mp-gcc44

User · Answer

I m just dropping in to say that using a soft link to accomplish this is a terrible  no-good  horrible idea     One of the key things about writing software is reproduceability - you want to be able to get the same results every time   These systems are so complex that you want to reduce all invisible sources of error   Having a soft link is an invisible source of error   It s the sort of thing you ll forget in a month  then move to a different machine  and wonder why you are getting different results - or  you ll try to upgrade your system  and you ll get weird errors because it s not expecting a softlink there   Moreover  this isn t guaranteed to work - in particular  it s not clear that you will get the correct system include files  which have certainly changed between iterations of gcc   gcc select is a systematic way of doing the same thing which will work predictably  or in the very worst case you can file a bug report and get an eventual fix or fix it yourself   Unfortunately  -  gcc select does not affect which compiler XCode uses so it s not the way to go if you need to work in XCode  which I do    I still don t know what that way might be

User · Answer

in  usr bin type  sudo ln -s -f g  -4 2 g    sudo ln -s -f gcc-4 2 gcc  That should do it

User · Answer

Whatever Apple ships as the default gcc in xcode  4 2 1 on 10 6  4 0 1 before  is well tested  and maintained  by the apple guys and the  standard  to build software with on OS X  Everything else is not  so think twice if you want to develop software  or be gcc OS X beta tester

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