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copied!<p> Here is a way to enable compiling with <strong><em>gcc 4.2</em></strong> in <strong><em>xcode 4.2</em></strong>. This is mostly done via command line so when you see lines starting with: <code>[ 15:30 jon@MacBookPro / ]$</code>, you need to open up <em>Terminal.app</em> and run the command that starts after the <code>$</code>.</p> <blockquote> <p>No files or directories are <em>removed</em> or <em>deleted</em> in this process, so it is easy to undo if you need to compile with LLVM in the future.</p> </blockquote> <ol> <li><p>Download - but do <strong>not</strong> install <em>yet</em> - <a href="https://developer.apple.com/downloads/download.action?path=Developer_Tools/xcode_4.1_for_lion/xcode_4.1_for_lion.dmg" rel="nofollow noreferrer">xcode_4.1_for_lion.dmg</a> or <a href="https://developer.apple.com/downloads/download.action?path=Developer_Tools/xcode_4.1_for_snow_leopard_21110/xcode_4.1_for_snow_leopard.dmg" rel="nofollow noreferrer">xcode_4.1_for_snow_leopard.dmg</a></p></li> <li><p>Now, follow these steps to install Xcode 4.1 into <code>/Developer-4.1</code>:</p> <ol> <li><p>Backup the working <code>/Developer</code> directory (where Xcode 4.2 is installed)</li></p> <pre class="lang-bsh prettyprint-override"><code>[ 15:30 jon@MacBookPro / ]$ sudo mv -v /Developer /Developer-4.2 </code></pre></li> <li><p>Run the Xcode 4.1 installer using the default install location (<code>/Developer</code>)</p></li> <li><p>Move the new Xcode 4.1 installation to <code>/Developer-4.1</code>:</p> <pre class="lang-bsh prettyprint-override"><code>[ 15:30 jon@MacBookPro / ]$ sudo mv -v /Developer /Developer-4.1 </code></pre></li> <li><p>Move the Xcode 4.2 developer directory back to <code>/Developer</code>:</p> <pre class="lang-bsh prettyprint-override"><code>[ 15:30 jon@MacBookPro / ]$ sudo mv -v /Developer-4.2 /Developer </code></pre></li> </ol></li> <li><p>Edit the Xcode 4.2 <code>GCC 4.2.xcspec</code> file to get gcc 4.2 to show in the list of compiler options <sup>[1]</sup>:</p> <pre class="lang-bsh prettyprint-override"><code>[ 15:30 jon@MacBookPro / ]$ sudo vi "/Developer/Library/Xcode/PrivatePlugIns/Xcode3Core.ideplugin/Contents/SharedSupport/Developer/Library/Xcode/Plug-ins/GCC 4.2 (Plausible Blocks).xcplugin/Contents/Resources/GCC 4.2.xcspec" </code></pre> <ul> <li><p>Change lines <strong>41</strong> and <strong>42</strong> from this:</p> <pre class="lang-bsh prettyprint-override"><code>ShowInCompilerSelectionPopup = NO; IsNoLongerSupported = YES; </code></pre></li> <li><p>To This:</p> <pre class="lang-bsh prettyprint-override"><code>ShowInCompilerSelectionPopup = YES; IsNoLongerSupported = NO; </code></pre></li> </ul></li> <li><p>Backup the Xcode 4.2 iOS/Simulator Framework <code>usr</code> directories:</p> <pre class="lang-bsh prettyprint-override"><code>[ 15:30 jon@MacBookPro / ]$ sudo mv -v /Developer/Platforms/iPhoneOS.platform/Developer/usr /Developer/Platforms/iPhoneOS.platform/Developer/usr.backup [ 15:30 jon@MacBookPro / ]$ sudo mv -v /Developer/Platforms/iPhoneSimulator.platform/Developer/usr /Developer/Platforms/iPhoneSimulator.platform/Developer/usr.backup </code></pre></li> <li><p>Copy Xcode 4.1 iOS/Simulator Framework <code>usr</code> directories to Xcode 4.2:</p> <pre class="lang-bsh prettyprint-override"><code>[ 15:30 jon@MacBookPro / ]$ sudo cp -rv /Developer-4.1/Platforms/iPhoneOS.platform/Developer/usr /Developer/Platforms/iPhoneOS.platform/Developer/usr [ 15:30 jon@MacBookPro / ]$ sudo cp -rv /Developer-4.1/usr /Developer/Platforms/iPhoneSimulator.platform/Developer/usr </code></pre></li> <li><p>Copy the <code>gcc</code> and <code>info</code> iOS SDK library directories from Xcode 4.1 to Xcode 4.2 <sup>[2]</sup>:</p> <pre class="lang-bsh prettyprint-override"><code>[ 15:30 jon@MacBookPro / ]$ sudo cp -rv /Developer-4.1/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/gcc /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/gcc [ 15:30 jon@MacBookPro / ]$ sudo cp -rv /Developer-4.1/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/info /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/info </code></pre></li> <li><p><strong>Compile using gcc-4.2!</strong></p> <p><img src="https://i.stack.imgur.com/sIfUc.png" alt="Screenshot of CGG 4.2 in xcode 4.2"></p></li> </ol> <p><strong><a href="http://blog.hozbox.com/2011/11/08/how-to-use-gcc-4-2-with-xcode-4-2/" rel="nofollow noreferrer">This is a blog post I've written with a little more info about this process. Feel free to leave a comment on the blog if you run into any issues or have any questions.</a></strong></p> <hr> <p><sup>[1]</sup> If opening from a command line (using something like <code>vi</code>, <code>emacs</code>, <code>nano</code>, etc) make sure to either enclose the path in quotes <kbd>"/long path/with spaces/in it/file.xcspec"</kbd> or escape the spaces <kbd>/some/long\ path/with\ spaces/in\ it/file.xcspec</kbd><br/></p> <p><sup>[2]</sup> This is necessary because the iPhoneOS.platform SDK has its own seperate <code>/usr/lib</code> directories but the iPhoneSimulator.platform SDK does not</p>

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