问题
on my new macbook pro with osx lion and XCode 4.1 I have some problems with gcc.
In /usr/bin I cannot find gcc-4.2
I only have the following versions:
i686-apple-darwin11-llvm-gcc-4.2
llvm-gcc
llvm-gcc-4.2
As a result when I try to select gcc42 by means of port select --set gcc gcc42 it returns me the following error:
Selecting 'gcc42' for 'gcc' failed: could not create new link "/opt/local/bin/gcc": target "/usr/bin/gcc-4.2" doesn't exist
However port select gcc returns me the following versions:
apple-gcc42
gcc42
llvm-gcc42 (active)
mp-gcc44
How can I fix this problem?
Thanks!
回答1:
There should be a /usr/bin/gcc-4.2 with Xcode 4.1 installed. However, with the recent Xcode 4.2 update, Apple has finally removed their modified standard gcc-4.2. What remains is either llvm-gcc42 (also symlinked to gcc) and clang, the newer non-gcc C compiler. Apple is making the transition to clang; the first step is using the hybrid llvm-gcc42. There have been some reported problems using either of the new compilers. You should be using this time to figure out if you have problems with them and, if so, fix your code and report bugs to Apple. In the meantime, if you absolutely have to have the old gcc-4.2, it is possible to build one similar to the previous Apple-modified one via MacPorts:
port install apple-gcc42
but you'll be swimming against the tide.
回答2:
I could manage to solve this issue in Mountain Lion with a symbolic link:
sudo ln -s /usr/bin/llvm-gcc-4.2 /usr/bin/gcc-4.2
Hope this help someone
回答3:
With Xcode 4.3, you need to install the Command Line Tools separately. XCode -> Preferences -> Downloads, Click the Components button, and then click Install next to the "Command Line Tools" option.
回答4:
I had the same issue.
I fixed it by doing a symlink.
Like this :
cd /usr/bin
then :
sudo ln -s llvm-gcc-4.2 gcc-4.2
回答5:
You might consider compiling a newer GCC (e.g. 4.6.2) from its source code. Apple does not care much any more about GCC, but GCC has made significant progress since 4.2
And you probably could use your llvm-gcc42 as a GCC compiler.
回答6:
I tampered with the innards of the makefile and found out that one invoked option provided an argument too many; replaced the variable with the actual result of the function called on my machine (removing the excess argument) and did run make again it worked.
来源：https://stackoverflow.com/questions/8007683/gcc-4-2-version-missing