title: Is it possible to completely remove GCC from my mac? If so, how do I do that?
body: <p>I recently completely messed up GCC after attempting to get it to work with openMP. Right now GCC can't even compile/run a simple "helloworld" program in C. When I type in "gcc helloworld.c -o Result", it gives me an "ld: library not found for -lgcc" error. </p>
  
  <p>Every single time I try to install gcc/reinstall gcc by doing something like 
  gcc with --without-multilib, it gives me something like this:</p>
  
  <pre><code>==&gt; Reinstalling gcc with --without-multilib
  ==&gt; Downloading http://ftpmirror.gnu.org/gcc/gcc-5.3.0/gcc-5.3.0.tar.bz2
  ==&gt; Downloading from http://open-source-box.org/gcc/gcc-5.3.0/gcc-5.3.0.tar.bz2
  ######################################################################## 100.0%
  
  ^[[D==&gt; Patching
  patching file gcc/jit/Make-lang.in
  patching file gcc/jit/jit-playback.c
  Hunk #1 succeeded at 2470 with fuzz 2 (offset 54 lines).
  ==&gt; ../configure --build=x86_64-apple-darwin15.2.0 --prefix=/usr/local/Cellar/gc
  ^R
  
  ==&gt; make bootstrap
  Last 15 lines from /Users/bettyjing/Library/Logs/Homebrew/gcc/02.make:
  checking for a BSD-compatible install... /usr/bin/install -c
  checking for gawk... awk
  checking for x86_64-apple-darwin15.2.0-ar... ar
  checking for x86_64-apple-darwin15.2.0-lipo... lipo
  checking for x86_64-apple-darwin15.2.0-nm... /private/tmp/gcc20160131-67124-kpenwb/gcc-5.3.0/build/./gcc/nm
  checking for x86_64-apple-darwin15.2.0-ranlib... ranlib
  checking for x86_64-apple-darwin15.2.0-strip... strip
  checking whether ln -s works... yes
  checking for x86_64-apple-darwin15.2.0-gcc... /private/tmp/gcc20160131-67124-kpenwb/gcc-5.3.0/build/./gcc/xgcc -B/private/tmp/gcc20160131-67124-kpenwb/gcc-5.3.0/build/./gcc/ -B/usr/local/Cellar/gcc/5.3.0/x86_64-apple-darwin15.2.0/bin/ -B/usr/local/Cellar/gcc/5.3.0/x86_64-apple-darwin15.2.0/lib/ -isystem /usr/local/Cellar/gcc/5.3.0/x86_64-apple-darwin15.2.0/include -isystem /usr/local/Cellar/gcc/5.3.0/x86_64-apple-darwin15.2.0/sys-include   
  checking for suffix of object files... configure: error: in `/private/tmp/gcc20160131-67124-kpenwb/gcc-5.3.0/build/x86_64-apple-darwin15.2.0/libgcc':
  configure: error: cannot compute suffix of object files: cannot compile
  See `config.log' for more details.
  make[2]: *** [configure-stage1-target-libgcc] Error 1
  make[1]: *** [stage1-bubble] Error 2
  make: *** [bootstrap] Error 2
  
  READ THIS: https://git.io/brew-troubleshooting
  
  These open issues may also help:
  brew reinstall gcc --without-multilib error https://github.com/Homebrew/homebrew/issues/48212
  brew install gcc --without-multilib stucks during 'make bootstrap' https://github.com/Homebrew/homebrew/issues/48612
  gcc: warning: couldn't understand kern.osversion '15.0.0 https://github.com/Homebrew/homebrew/issues/48623
  graphicsmagick fails to compile with gcc-5 in superenv https://github.com/Homebrew/homebrew/issues/48402
  gcc failed to build on 10.6.8 https://github.com/Homebrew/homebrew/issues/47741
  apple-gcc42 takes priority over modern gcc https://github.com/Homebrew/homebrew/issues/41055
  gcc causes false alarms in C++ stdlib check https://github.com/Homebrew/homebrew/issues/45218
  gcc 4.9.2 fails to produce debugging information https://github.com/Homebrew/homebrew/issues/34976
  Object files deleted during build of gcc needed by gdb https://github.com/Homebrew/homebrew/issues/35734
  MacOS.(gcc|clang|llvm)_version can return nil https://github.com/Homebrew/homebrew/issues/18781.
  </code></pre>
  
  <p>To fix this, is there a way to remove GCC completely and then just install it again? Or are there other solutions for this? Please help me!</p>