CODEWITHSUNDEEP
gcchomebrew
ishmael
ishmael

Reputation: 1906

Homebrew cannot find gcc

I'm having trouble getting homebrew to work on Lion. For some reason, it is picking up clang rather than gcc.

==> Upgrading gnutls
...
checking for gcc...
/usr/bin/clang checking whether the C compiler works... no

'brew doctor' says:

We couldn't detect gcc 4.2.x. Some formulae require this compiler. NOTE: Versions of XCode newer than 4.2 don't include gcc 4.2.x.

NOTE: I have already installed command line tools from XCode, including gcc.

$ which gcc
/usr/bin/gcc
$ gcc -v
gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)

How can I force brew to use gcc?

Upvotes: 8

Views: 11486

Answers (3)

Big McLargeHuge
Big McLargeHuge

Reputation: 16076

I'm not sure when this changed, but Apple command line tools now include gcc and clang executables:

$ which gcc
/usr/bin/gcc

$ gcc -v
Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
Apple clang version 11.0.0 (clang-1100.0.33.17)
Target: x86_64-apple-darwin19.3.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

$ which clang
/usr/bin/clang

$ clang -v
Apple clang version 11.0.0 (clang-1100.0.33.17)
Target: x86_64-apple-darwin19.3.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

You can get it by running:

$ xcode-select --install

Upvotes: 0

PositiveGuy
PositiveGuy

Reputation: 47783

If you have Yosemite watch this video, it'll prompt you for XCode right from the command-prompt when you install Homebrew

http://dimecasts.net/Casts/CastDetails/218

Upvotes: 0

Frizlab
Frizlab

Reputation: 911

After Xcode 4.2, Apple stopped distributing gcc with Xcode. Instead, they distribute llvm-gcc (and clang), which are not gcc. You can see this with gcc -v, like you did: it shows LLVM build.

In order to use gcc, you will have to compile it yourself. There is a homebrew formula for this, but you will have to tap homebrew/dupes with brew tap homebrew/dupes.

Note that as of today, the gcc formula doesn't work if compiled with clang. You have to install it with brew install --use-llvm gcc.

Also note that Homebrew explicitly search for gcc-4.2. You will have to create a symlink for Homebrew to find gcc.

Upvotes: 12

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