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7 <title>"clang" C Language Family Frontend for LLVM</title>
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Chris Lattner29754e62007-12-09 08:17:09 +0000[diff] [blame]14 <h1>clang: a C language family frontend for LLVM</h1>
15
Chris Lattner5ea74932007-12-09 09:05:23 +0000[diff] [blame]16 <p>The goal of the Clang project is to create a new C, C++, Objective C and
17 Objective C++ front-end for the <a href="http://www.llvm.org/">LLVM</a>
18 compiler.</p>
Chris Lattner1c057262007-12-09 08:38:01 +0000[diff] [blame]19
Chris Lattner48b7de62007-12-10 05:10:14 +0000[diff] [blame]20 <h2>Features/Goals</h2>
21
22 <p>Some of the goals for the project include the following:</p>
23
24 <ul>
25 <li>Real-world, production quality compiler.</li>
26 <li>A single unified parser for C, Objective C, C++, and Objective
27 C++.</li>
28 <li>Language conformance with these languages and their variants, like
29 C90, C99, etc.</li>
30 <li>GCC compatibility: support GCC extensions, but allow them to be
31 disabled.</li>
32 <li><a href="features.html#performance">High performance and low memory
33 use</a>.</li>
34 <li>Build a library-based architecture with finely crafted APIs, allowing
35 the code to be reused in many ways.</li>
36 <li>Support many clients such as refactoring, static analysis, as well as
37 code generation.</li>
38 <li>Design for integration with IDEs as well as code generation with the
39 <a href="http://llvm.org">LLVM Optimizer and Code Generator</a>.</li>
40 <li><a href="features.html#expressivediags">Expressive diagnostics</a>:
41 warnings and errors that are actually helpful and make sense.</li>
42 <li>Use the LLVM <a
43 href="http://llvm.org/svn/llvm-project/cfe/trunk/LICENSE.TXT">'BSD'
44 License</a>.</li>
45 </ul>
46
47 <p>Of course this is only a rough outline of the goals and features of
48 Clang. To get a true sense of what the new LLVM front-end is all about,
49 as well as why you might want to considering using it, see the <a
50 href="features.html">Features</a> section.</p>
51
52
53 <h2>Why?</h2>
Chris Lattner5ea74932007-12-09 09:05:23 +0000[diff] [blame]54
55 <p>The development of a new front-end was started out of a need -- a need
56 for a compiler that allows better diagnostics, better integration with
57 IDEs, a license that is compatible with commercial products, and a
58 compiler that is easier to develop and maintain. All of these were
59 motivations for starting work on a new front-end that could
60 meet these needs.</p>
61
Chris Lattner65b3c272007-12-09 17:50:14 +0000[diff] [blame]62 <p>A good (but quite dated) introduction to Clang can be found in the
Chris Lattner5ea74932007-12-09 09:05:23 +0000[diff] [blame]63 following video lectures:</p>
64
Chris Lattner29754e62007-12-09 08:17:09 +0000[diff] [blame]65 <ul>
66 <li><a href="clang_video-05-25-2007.html">Clang Introduction</a>
Chris Lattner5ea74932007-12-09 09:05:23 +0000[diff] [blame]67 (May 2007)</li>
68 <li><a href="clang_video-07-25-2007.html">Features and Performance of
69 Clang</a> (July 2007)</li>
Chris Lattner29754e62007-12-09 08:17:09 +0000[diff] [blame]70 </ul>
Chris Lattner5ea74932007-12-09 09:05:23 +0000[diff] [blame]71
Chris Lattner48b7de62007-12-10 05:10:14 +0000[diff] [blame]72 <p>For a more detailed comparison between Clang and other compilers, please
Chris Lattner2d8e3562007-12-10 02:25:51 +0000[diff] [blame]73 see the <a href="comparison.html">clang comparison page</a>.</p>
74
Chris Lattner48b7de62007-12-10 05:10:14 +0000[diff] [blame]75 <h2>Current Status</h2>
Chris Lattner5ea74932007-12-09 09:05:23 +0000[diff] [blame]76
77 <p>Clang is still in early development stages. If you are looking for
78 source analysis or source-to-source transformation tools, clang is probably
79 a great solution for you. If you want to use it as a drop in C compiler, it
80 is not yet ready.</p>
81
82 <p>Clang currently has pretty good parsing and semantic analysis support for
83 C and Objective-C right now, and bugs are usually quickly fixed once
84 reported. C++ support is still very early, and we don't expect to have
85 respectable C++ support for another 2 years or so.</p>
86
Chris Lattner29754e62007-12-09 08:17:09 +0000[diff] [blame]87 <h2>Get Involved</h2>
Chris Lattner5ea74932007-12-09 09:05:23 +0000[diff] [blame]88
89 <p>The developers of Clang include contributers from Apple and numerous
90 other volunteers. If you are interested in joining the community or
91 learning more, please consider joining the <a
92 href="http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev">cfe-dev</a>
93 mailing list, or start by browsing its archives.</p>
94
95 <p>If you are interested in trying out Clang, please see the build
Chris Lattner48b7de62007-12-10 05:10:14 +0000[diff] [blame]96 instructions on the <a href="get_involved.html#build">Get Involved</a>
Chris Lattner5ea74932007-12-09 09:05:23 +0000[diff] [blame]97 page.</p>
Chris Lattner29754e62007-12-09 08:17:09 +0000[diff] [blame]98 </div>
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