No require_gcc() for ruby-1.9.3-p125? #130

telemachus opened this Issue Feb 17, 2012 · 14 comments


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I'm wondering if it would make sense to remove the requirement of gcc-4.2 for ruby-1.9.3-p125.

  • It will now build with CC=/usr/bin/gcc or --with-gcc=clang. (I've tested both now, and in answer to a question posed on Twitter, tests pass as well).
  • Part of the point of the release is that it fixes compiler-related bugs in OSX.
  • Newer versions of Xcode simply don't have gcc-4.2. So this would help people with more recent installs of OSX, Xcode tools, etc. (A note to self and others: If you really want gcc-4.2, this walkthrough gets the job done.)
lucsky commented Feb 17, 2012




ruby-build is not working with Command Line Tools for Xcode


@rafaelfranca If you comment out the first line of share/ruby-build/1.9.3-p125 (which calls require_gcc), then it will work if you run it like this:

CC=/usr/bin/gcc bin/ruby-build share/ruby-build/1.9.3-p125 <target-directory>

Yeah, I tried this without success. The fail was the configure step in ruby compilation. But this is not ruby-build fault


Ah, then actually I'm not sure what's up. I have only the command line tools for Xcode installed, and I was able to build 1.9.3-p125 successfully that way. Are you building an different Ruby interpreter?


I'm not sure too. I'll try again later. But this issue remains valid since we don't need the require_gcc at top of 1.9.3-p125 file

priteau commented Feb 18, 2012

@rafaelfranca Did you set the CC environment variable? I first tried without it, and configure failed because it was using gcc-4.2 as compiler (which doesn't exist on my system).

I compiled the new Ruby successfully using rbenv + ruby-build and the Command Line Tools for Xcode like this:

env CC=/usr/bin/gcc rbenv install 1.9.3-p125

Yeah. With the CC environment variable it worked.

kommen commented Feb 20, 2012

Removing the require_gcc line for 1.9.3-p125 and compiling it with the CC environment variable also fixed building gems with native extensions for me with Xcode 4.3 + command line tools package installed.


I installed the Command Line Tools for Xcode

After removing the require_gcc line from share/ruby-build/1.9.3-p125, Ruby 1.9.3-p125 successfully compiled with rbenv install 1.9.3-p125. To set the environment variable CC was not required.

mystix commented Feb 21, 2012

I'm using rbenv + ruby-build.

I have both Xcode 4.3 and the Command line tools for Xcode installed on 2 different macbook pros
-- one was upgraded from Snow Leopard to Lion, one came with Lion pre-installed.

I had to set the CC environment variable on the macbook with Lion pre-installed before ruby would compile successfully.
The compilation fails with the following error message otherwise:

checking build system type... x86_64-apple-darwin11.3.0
checking host system type... x86_64-apple-darwin11.3.0
checking target system type... x86_64-apple-darwin11.3.0
checking whether the C compiler works... no
configure: error: in `/var/folders/rl/lvppm_c564j3rlh3hyhddh680000gn/T/ruby-build.20120222000523.27004/ruby-1.9.3-p125':
configure: error: C compiler cannot create executables

The upgraded macbook ran just fine with the rbenv install 1.9.3-p125 command.

jeremy commented Feb 21, 2012

Fixed @ 45d4277. Tested with XCode 4.4 toolchain.

@jeremy jeremy closed this Feb 21, 2012
atipugin commented Mar 3, 2012

Installed head version of ruby-build w/ command-line-tools. It works only after setting CC env var, like mentioned before.

Empact commented Mar 7, 2012

Indeed, require_gcc also exports CC - this should be revisited.

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