How to Install G++ on MACos X

How do I install g++ on MacOS X?

That's the compiler that comes with Apple's XCode tools package. They've hacked on it a little, but basically it's just g++.

You can download XCode for free (well, mostly, you do have to sign up to become an ADC member, but that's free too) here: http://developer.apple.com/technology/xcode.html

Edit 2013-01-25: This answer was correct in 2010. It needs an update.

While XCode tools still has a command-line C++ compiler, In recent versions of OS X (I think 10.7 and later) have switched to clang/llvm (mostly because Apple wants all the benefits of Open Source without having to contribute back and clang is BSD licensed). Secondly, I think all you have to do to install XCode is to download it from the App store. I'm pretty sure it's free there.

So, in order to get g++ you'll have to use something like homebrew (seemingly the current way to install Open Source software on the Mac (though homebrew has a lot of caveats surrounding installing gcc using it)), fink (basically Debian's apt system for OS X/Darwin), or MacPorts (Basically, OpenBSDs ports system for OS X/Darwin) to get it.

Fink definitely has the right packages. On 2016-12-26, it had gcc 5 and gcc 6 packages.

I'm less familiar with how MacPorts works, though some initial cursory investigation indicates they have the relevant packages as well.

Set up g++ on OS X

Installing the Command Line Tools (OS X Mavericks) for Xcode - Late October 2013 solved it for me. Here is the link:

OSX: Xcode Downloads

The often mentioned xcode-select --install command kept saying it cannot find the requested software.

To clarify: You need to already have gcc-4.7 installed using Homebrew. The update to the latest version of CMD Tools only fixes compatibility issues caused by upgrading from Mountain Lion to Mavericks.

Installing GCC on macOS Catalina

Probably not the elegant answer, but it worked. I was able to find the header files needed using $(xcrun --show-sdk-path) I then copied them all to /usr/local where the gcc location was expecting them to be. Now all works.

g++ in mac osx 10.7

Yes, the update removes some installed components, among them Java and the OS X managed GCC installation. If you had Xcode installed before, it won’t be usable any longer.

You need to (re)install the current Xcode version from the App Store to use GCC.

Install GCC on Mac OS high sierra

Any idea on how can I install https://gcc.gnu.org/ standalone on my system?

Generally speaking: Don't. That isn't a standard configuration; Clang is the recommended compiler for current macOS systems.

If you have a very good reason, you can use Homebrew to install GCC (brew install gcc). Keep in mind that it cannot be used to build native macOS applications.

Is there a way to install gcc in OSX without installing Xcode?

Try the osx-gcc-installer on github.

Installing g++ to terminal from files on my mac

houbysoft's answer above is correct, but the OP needs a little more detail.

The basic idea is that you need the "Command Line Tools" environment installed. But the name for that environment, and how you install it, has changed multiple times over the years. So, houbysoft's steps work for 4.3.3, but not for 3.2.6.

In the 3.2 era, the tools were called "UNIX Development". And, rather than being downloaded and installed from within Xcode, they came as part of the Xcode mpkg and were installed as part of the initial Xcode install. In most versions, there was a checkbox named "UNIX Development", usually checked by default, but in some versions it was a separate step. Looking at the "Xcode 3.2.6 and IOS SDK 4.3" disk image currently available from Apple, it's a checkbox. Anyway, that's the only officially-supported way to get them, but lots of other ways work… Here are your options:

Throw away Xcode 3.2.6 (just trash the whole /Developer) and install 4.3.3, then follow houbysoft's steps to get the Command Line Tools. Unless there's a good reason you can't use 4.3, this is almost certainly the best answer.
Throw away Xcode 3.2.6 and reinstall it, and this time make sure the "UNIX Development" checkbox is on.
Just re-run the 3.2.6 installer, and make sure the "UNIX Development" checkbox is on.
Log into developer.apple.com and look through the downloads for a package named "UNIX Development Tools", "Developer Tools CLI", "CLI Developer Environment", "Command Line Tools", or similar that corresponds to 3.2.6. There is such a package for most, but not all, versions of Xcode, and can be used to set up a command-line build environment either with or without Xcode.
Look at the invisible packages on the Xcode disk image. I don't remember whether you need just DeveloperToolsCLI.pkg, or that plus a few others, but a bit of trial and error or googling should get you there.

Can I have gcc/g++ on MacOS X 10.11 pointing to the ACTUAL gcc/g++?

Include in your PATH, before /usr/bin, a directory that contains a symbolic link named gcc pointing to /…/bin/gcc-5.

The latest Mac OS X does not let you change /usr, from what I hear, so this conservative solution is the only one available.

when I invoke those commands, both from the terminal and through makefiles.

If you adjust your PATH variable in your .profile, both these cases will be covered.