Fixes Homebrew/homebrew#30 -- GCC can't create executables

The fix is to error out if GCC isn't installed, and to ensure we aren't
setting CC and CXX to something that doesn't exist.

1 files changed, 6 insertions, 1 deletions

diff --git a/bin/brew b/bin/brew
index e58fa38db..b8e726c60 100755
--- a/bin/brew
+++ b/bin/brew
@@ -75,13 +75,18 @@ begin
         exit 0
       end
 
+      require 'brewkit'
+
       if ARGV.verbose?
-        require 'brewkit'
         ohai "Build Environment"
         %w[CFLAGS LDFLAGS CPPFLAGS MAKEFLAGS CC CXX].each do |f|
           puts "#{f}: #{ENV[f]}" unless ENV[f].to_s.empty?
         end
       end
+      
+      unless system "which #{ENV['CC'] or 'cc'} &> /dev/null" and $?.success?
+        raise "We cannot find a c compiler, have you installed the latest Xcode?"
+      end
 
       # we need to ensure a pristine ENV for each process or the formula
       # will start with the ENV from the previous build