Error running 'make -j2' when installing RVM

Question

I'm following this tutorial on setting up Rails on your Mac :

http://www.moncefbelyamani.com/how-to-install-xcode-homebrew-git-rvm-ruby-on-mac/

When I get to Step 6: Install RVM with Ruby 1.9.3, and run curl -L https://get.rvm.io | bash -s stable --ruby to install RVM, I get the following error :

Error running 'make -j2', please read ~/.rvm/log/ruby-1.9.3-p385/make.log
There has been an error while running make. Halting the installation.

In make.log, here is what it generated :

regparse.c:582:15: error: implicit conversion loses integer precision: 'st_index_t' (aka 'unsigned long') to 'int' [-Werror,-Wshorten-64-to-32]
    return t->num_entries;
    ~~~~~~ ~~~^~~~~~~~~~~
1 error generated.
make: *** [regparse.o] Error 1
make: *** Waiting for unfinished jobs....

I find this strage as I've followed this guide before on a similar setup and didn't encounter any problems.

Any ideas?

Answer 1

This error occurs when you compile Ruby with clang => https://bugs.ruby-lang.org/issues/7830

Unless you are interested in testing Ruby/clang compatibility you would be better with compiling ruby using gcc-4.2 (see https://bugs.ruby-lang.org/issues/5883 for details)

Skip the --ruby flag from the installer:

\curl -L https://get.rvm.io | bash -s stable

RVM has a command to install all required packages using homebrew:

rvm requirements run force

In case homebrew is not available it will display the list of required packages.

Alternative there is a patch that could make it working with clang, install ruby using:

rvm install 1.9.3-p385 --patch https://bugs.ruby-lang.org/attachments/download/3496/disable-werror.patch -C --disable-werror