www/index.html - platform/external/clang - Gitiles

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   <h1>clang: a C language family frontend for LLVM</h1>
   <!--*********************************************************************-->

   <p>The goal of the Clang project is to create a new C, C++, Objective C and
   Objective C++ front-end for the <a href="http://www.llvm.org/">LLVM</a>
   compiler.  You can <a href="get_started.html">get and build</a> the source
   today.</p>

   <!--=====================================================================-->
   <h2 id="goals">Features and Goals</h2>
   <!--=====================================================================-->

   <p>Some of the goals for the project include the following:</p>

   <p><b><a href="features.html#enduser">End-User Features</a></b>:</p>

   <ul>
   <li>Fast compiles and low memory use</li>
   <li>Expressive diagnostics</li>
   <li>GCC compatibility</li>
   </ul>

   <p><b><a href="features.html#applications">Utility and
      Applications</a></b>:</p>

   <ul>
   <li>Modular library based architecture</li>
   <li>Support diverse clients (refactoring, static analysis, code generation,
    etc)</li>
   <li>Allow tight integration with IDEs</li>
   <li>Use the LLVM 'BSD' License</li>
   </ul>

   <p><b><a href="features.html#design">Internal Design and
      Implementation</a></b>:</p>

   <ul>
   <li>A real-world, production quality compiler</li>
   <li>A simple and hackable code base</li>
   <li>A single unified parser for C, Objective C, C++, and Objective C++</li>
   <li>Conformance with C/C++/ObjC and their variants</li>
   </ul>

   <p>Of course this is only a rough outline of the goals and features of
      Clang.  To get a true sense of what it is all about, see the <a
      href="features.html">Features</a> section, which breaks
      each of these down and explains them in more detail.</p>


   <!--=====================================================================-->
   <h2>Why?</h2>
   <!--=====================================================================-->

   <p>The development of a new front-end was started out of a need -- a need
      for a compiler that allows better diagnostics, better integration with
      IDEs, a license that is compatible with commercial products, and a
      nimble compiler that is easy to develop and maintain.  All of these were
      motivations for starting work on a new front-end that could
      meet these needs.</p>

   <p>A good (but quite dated) introduction to Clang can be found in the
      following video lectures:</p>

   <ul>
     <li><a href="clang_video-05-25-2007.html">Clang Introduction</a>
         (May 2007)</li>
     <li><a href="clang_video-07-25-2007.html">Features and Performance of
         Clang</a>  (July 2007)</li>
   </ul>

   <p>For a more detailed comparison between Clang and other compilers, please
      see the <a href="comparison.html">clang comparison page</a>.</p>

   <!--=====================================================================-->
   <h2>Current Status</h2>
   <!--=====================================================================-->

   <p>Clang is still in early development stages.  If you are looking for
   source analysis or source-to-source transformation tools, clang is probably
   a great solution for you.  If you want to use it as a drop in C compiler, it
   is not yet ready.</p>

   <p>Clang currently has pretty good parsing and semantic analysis support for
      C and Objective-C right now, and bugs are usually quickly fixed once
      reported.  <a href="cxx_status.html">C++ support</a> is still very early,
      and we don't expect to have respectable C++ support for another 2 years
      or so.</p>

   <!--=====================================================================-->
   <h2>Get it and get involved!</h2>
   <!--=====================================================================-->

   <p>Start by <a href="get_started.html">getting the code, building it, and
      playing with it</a>.  This will show you the sorts of things we can do
      today and will let you have the "clang experience" first hand: hopefully
      it will "resonate" with you. :)</p>

   <p>Once you've done that, please consider <a href="get_involved.html">getting
      involved in the clang community</a>.  The clang developers include numerous
      volunteer contributors with a variety of backgrounds.  If you're
      interested in
      following the development of clang, signing up for a mailing list is a good
      way to learn about how the project works.</p>
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	<link type="text/css" rel="stylesheet" href="content.css" />
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	<!--#include virtual="menu.html.incl"-->
	<div id="content">
	<!--*********************************************************************-->
	<h1>clang: a C language family frontend for LLVM</h1>
	<!--*********************************************************************-->

	<p>The goal of the Clang project is to create a new C, C++, Objective C and
	Objective C++ front-end for the <a href="http://www.llvm.org/">LLVM</a>
	compiler. You can <a href="get_started.html">get and build</a> the source
	today.</p>

	<!--=====================================================================-->
	<h2 id="goals">Features and Goals</h2>
	<!--=====================================================================-->

	<p>Some of the goals for the project include the following:</p>

	<p><b><a href="features.html#enduser">End-User Features</a></b>:</p>

	<ul>
	<li>Fast compiles and low memory use</li>
	<li>Expressive diagnostics</li>
	<li>GCC compatibility</li>
	</ul>

	<p><b><a href="features.html#applications">Utility and
	Applications</a></b>:</p>

	<ul>
	<li>Modular library based architecture</li>
	<li>Support diverse clients (refactoring, static analysis, code generation,
	etc)</li>
	<li>Allow tight integration with IDEs</li>
	<li>Use the LLVM 'BSD' License</li>
	</ul>

	<p><b><a href="features.html#design">Internal Design and
	Implementation</a></b>:</p>

	<ul>
	<li>A real-world, production quality compiler</li>
	<li>A simple and hackable code base</li>
	<li>A single unified parser for C, Objective C, C++, and Objective C++</li>
	<li>Conformance with C/C++/ObjC and their variants</li>
	</ul>

	<p>Of course this is only a rough outline of the goals and features of
	Clang. To get a true sense of what it is all about, see the <a
	href="features.html">Features</a> section, which breaks
	each of these down and explains them in more detail.</p>


	<!--=====================================================================-->
	<h2>Why?</h2>
	<!--=====================================================================-->

	<p>The development of a new front-end was started out of a need -- a need
	for a compiler that allows better diagnostics, better integration with
	IDEs, a license that is compatible with commercial products, and a
	nimble compiler that is easy to develop and maintain. All of these were
	motivations for starting work on a new front-end that could
	meet these needs.</p>

	<p>A good (but quite dated) introduction to Clang can be found in the
	following video lectures:</p>

	<ul>
	<li><a href="clang_video-05-25-2007.html">Clang Introduction</a>
	(May 2007)</li>
	<li><a href="clang_video-07-25-2007.html">Features and Performance of
	Clang</a> (July 2007)</li>
	</ul>

	<p>For a more detailed comparison between Clang and other compilers, please
	see the <a href="comparison.html">clang comparison page</a>.</p>

	<!--=====================================================================-->
	<h2>Current Status</h2>
	<!--=====================================================================-->

	<p>Clang is still in early development stages. If you are looking for
	source analysis or source-to-source transformation tools, clang is probably
	a great solution for you. If you want to use it as a drop in C compiler, it
	is not yet ready.</p>

	<p>Clang currently has pretty good parsing and semantic analysis support for
	C and Objective-C right now, and bugs are usually quickly fixed once
	reported. <a href="cxx_status.html">C++ support</a> is still very early,
	and we don't expect to have respectable C++ support for another 2 years
	or so.</p>

	<!--=====================================================================-->
	<h2>Get it and get involved!</h2>
	<!--=====================================================================-->

	<p>Start by <a href="get_started.html">getting the code, building it, and
	playing with it</a>. This will show you the sorts of things we can do
	today and will let you have the "clang experience" first hand: hopefully
	it will "resonate" with you. :)</p>

	<p>Once you've done that, please consider <a href="get_involved.html">getting
	involved in the clang community</a>. The clang developers include numerous
	volunteer contributors with a variety of backgrounds. If you're
	interested in
	following the development of clang, signing up for a mailing list is a good
	way to learn about how the project works.</p>
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