README.markdown

After copying the patch into the OS X pasteboard, the patch like so:

$ cd /Library/RubyMotion
$ pbpaste | patch -p1

gistfile1.diff

commit 5ed4422f739eb19673d969377bdc8cdaf7bf9c4b
Author: Eloy Durán <eloy.de.enige@gmail.com>
Date:   Tue Sep 2 16:34:03 2014 +0200

    [GBM] Generate a tmp file with headers instead of passing all as arguments.
    
    Fixes http://hipbyte.myjetbrains.com/youtrack/issue/RM-581.

diff --git a/NEWS b/NEWS
index dece64b..24af7dd 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,8 @@
 = RubyMotion 2.33 =
 
   * Improved Enumerable#inject performance. ~40% times faster.
+  * Fixed a bug that could cause `gen_bridge_metadata' to be called with too
+    many arguments for a shell (on Yosemite) to handle.
   * [OSX] Fixed a bug that made it impossible to use a `NSApplication' subclass.
   * [OSX] Fixed a bug where it would trigger a crash when it will evaluates a
     expression on REPL on Yosemite.
diff --git a/bin/gen_bridge_metadata b/bin/gen_bridge_metadata
index d0567a0..7f27e98 100755
--- a/bin/gen_bridge_metadata
+++ b/bin/gen_bridge_metadata
@@ -91,6 +91,16 @@ if __FILE__ == $0
       g.out_file = opt
     end
 
+    # RubyMotion addition that allows us to overcome 'too many arguments' error
+    # when passing many headers to this tool.
+    opts.on('--headers FILE', 'Use headers listed in file as input.') do |file|
+      File.open(file, 'r') do |io|
+        io.each_line do |header|
+          g.add_header(header.strip)
+        end
+      end
+    end
+
     help_msg = "Use the `-h' flag or consult gen_bridge_metadata(1) for help."
     opts.on('-h', '--help', 'Show this message.') do
       puts opts, help_msg
diff --git a/lib/motion/project/xcode_config.rb b/lib/motion/project/xcode_config.rb
index df4a26c..2219d11 100644
--- a/lib/motion/project/xcode_config.rb
+++ b/lib/motion/project/xcode_config.rb
@@ -395,11 +395,19 @@ EOS
     end
 
     def gen_bridge_metadata(platform, headers, bs_file, c_flags, exceptions=[])
+      # Instead of potentially passing hundreds of arguments to the
+      # `gen_bridge_metadata` command, which can lead to a 'too many arguments'
+      # error, we list them in a temp file and pass that to the command.
+      require 'tempfile'
+      headers_file = Tempfile.new('gen_bridge_metadata-headers-list')
+      headers.each { |header| headers_file.puts(header) }
+      headers_file.close # flush
+      # Prepare rest of options.
       sdk_path = self.sdk(local_platform)
       includes = ['-I.'] + headers.map { |header| "-I'#{File.dirname(header)}'" }.uniq
       exceptions = exceptions.map { |x| "\"#{x}\"" }.join(' ')
       c_flags = "#{c_flags} -isysroot '#{sdk_path}' #{bridgesupport_cflags} #{includes.join(' ')}"
-      sh "RUBYOPT='' '#{File.join(bindir, 'gen_bridge_metadata')}' #{bridgesupport_flags} --cflags \"#{c_flags}\" #{headers.map { |x| "'#{x}'" }.join(' ')} -o '#{bs_file}' #{ "-e #{exceptions}" if exceptions.length != 0}"
+      sh "RUBYOPT='' '#{File.join(bindir, 'gen_bridge_metadata')}' #{bridgesupport_flags} --cflags \"#{c_flags}\" --headers \"#{headers_file.path}\" -o '#{bs_file}' #{ "-e #{exceptions}" if exceptions.length != 0}"
     end
 
     def define_global_env_txt