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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.</p>

     <h2><a name="goals">Features and Goals</a></h2>

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

     <ul>
     <li>Real-world, production quality compiler.</li>
     <li>A single unified parser for C, Objective C, C++, and Objective
         C++.</li>
     <li>Language conformance with these languages and  their variants, like
         C90, C99, etc.</li>
     <li>GCC compatibility: support GCC extensions, but allow them to be
         disabled.</li>
     <li><a href="features.html#performance">High performance and low memory
          use</a>.</li>
     <li>Support many clients such as refactoring, static analysis, as well as
         code generation.</li>
     <li>Build a library-based architecture with finely crafted APIs, allowing
         the code to be reused in many ways.</li>
     <li>Design for integration with IDEs as well as code generation with the
         <a href="http://llvm.org">LLVM Optimizer and Code Generator</a>.</li>
     <li><a href="features.html#expressivediags">Expressive diagnostics</a>:
         warnings and errors that are actually helpful and make sense.</li>
     <li>Use the LLVM <a
         href="http://llvm.org/svn/llvm-project/cfe/trunk/LICENSE.TXT">'BSD'
         License</a>.</li>
     <li>Finally, make the code clean and simple enough to make it understandable
         to anyone who knows the languages involved and has a basic idea of
         compilers work.</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.  The Features section 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.  C++ support is still very early, and we don't expect to have
        respectable C++ support for another 2 years or so.</p>

     <h2>Get Involved</h2>

     <p>The developers of Clang include contributers from Apple and numerous
        other volunteers.  If you are interested in joining the community or
        learning more, please consider joining the <a
        href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">cfe-dev</a>
        mailing list, or start by browsing its archives.</p>

     <p>If you are interested in trying out Clang, please see the build
        instructions on the <a href="get_involved.html#build">Get Involved</a>
        page.</p>
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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.</p>

	<h2><a name="goals">Features and Goals</a></h2>

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

	<ul>
	<li>Real-world, production quality compiler.</li>
	<li>A single unified parser for C, Objective C, C++, and Objective
	C++.</li>
	<li>Language conformance with these languages and their variants, like
	C90, C99, etc.</li>
	<li>GCC compatibility: support GCC extensions, but allow them to be
	disabled.</li>
	<li><a href="features.html#performance">High performance and low memory
	use</a>.</li>
	<li>Support many clients such as refactoring, static analysis, as well as
	code generation.</li>
	<li>Build a library-based architecture with finely crafted APIs, allowing
	the code to be reused in many ways.</li>
	<li>Design for integration with IDEs as well as code generation with the
	<a href="http://llvm.org">LLVM Optimizer and Code Generator</a>.</li>
	<li><a href="features.html#expressivediags">Expressive diagnostics</a>:
	warnings and errors that are actually helpful and make sense.</li>
	<li>Use the LLVM <a
	href="http://llvm.org/svn/llvm-project/cfe/trunk/LICENSE.TXT">'BSD'
	License</a>.</li>
	<li>Finally, make the code clean and simple enough to make it understandable
	to anyone who knows the languages involved and has a basic idea of
	compilers work.</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. The Features section 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. C++ support is still very early, and we don't expect to have
	respectable C++ support for another 2 years or so.</p>

	<h2>Get Involved</h2>

	<p>The developers of Clang include contributers from Apple and numerous
	other volunteers. If you are interested in joining the community or
	learning more, please consider joining the <a
	href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">cfe-dev</a>
	mailing list, or start by browsing its archives.</p>

	<p>If you are interested in trying out Clang, please see the build
	instructions on the <a href="get_involved.html#build">Get Involved</a>
	page.</p>
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