I need GCC for some Ruby gems. And I need LLVM as well for iOS development using Xcode 4.4. I already have LLVM installed through Xcode.
How can I install GCC in Mountain Lion without affecting any of LLVM binaries?
Macos – Install gcc in Mountain Lion
gccllvmmacososx-mountain-lionrbenv
Related Solutions
Because Floating Point Math is not Associative. The way you group the operands in floating point multiplication has an effect on the numerical accuracy of the answer.
As a result, most compilers are very conservative about reordering floating point calculations unless they can be sure that the answer will stay the same, or unless you tell them you don't care about numerical accuracy. For example: the -fassociative-math option of gcc which allows gcc to reassociate floating point operations, or even the -ffast-math option which allows even more aggressive tradeoffs of accuracy against speed.
Update:
You can now just run the following command from your terminal:
xcode-select --install
Starting with Xcode 4.3 - you must now manually install command line tools from Xcode menu > Preferences > Downloads.
Alternatively, there are stand-alone installation packages both for Mountain Lion (10.8) and for Mavericks (10.9).
This package enables UNIX-style development via Terminal by installing command line developer tools, as well as Mac OS X SDK frameworks and headers. Many useful tools are included, such as the Apple LLVM compiler, linker, and Make. If you use Xcode, these tools are also embedded within the Xcode IDE, and can be installed on your system using the Downloads preferences pane within Xcode 4.3 and later. This package requires Mac OS X 10.7.3 or later.
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Best Answer
The fact is that because you have Xcode you already have GCC installed on your system. If you're trying to run GCC from the terminal and getting "command not found" then the reason is, starting with OS X 10.8 (Mountain Lion), the GCC "command line tools" are not installed by default with Xcode. The install procedure depends on your version of OS X and Xcode:
Installing the GCC command line tools in OS X 10.8 (Xcode 4.4):
Xcode -> Preferences -> Download -> Components -> Command Line Tools -> install
Installing the GCC command line tools in OS X 10.9 (Xcode 5.02):
I have not tried these instructions myself, but I'll move them here if someone tries them and they work:
http://osxdaily.com/2014/02/12/install-command-line-tools-mac-os-x/