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gerrit-public.fairphone.software / toolchain / llvm-project / d2941b43f40d24f083b7ed4151d6e882a86d32c3 / . / clang / www / index.html
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Richard Smithd9d42f92018-03-01 22:01:06 +0000[diff] [blame]7 <title>Clang C Language Family Frontend for LLVM</title>
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Richard Smithd9d42f92018-03-01 22:01:06 +0000[diff] [blame]15 <h1>Clang: a C language family frontend for LLVM</h1>
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]16 <!--*********************************************************************-->
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]17
Richard Smithd9d42f92018-03-01 22:01:06 +0000[diff] [blame]18 <p>The Clang project provides a language front-end and tooling infrastructure
19 for languages in the C language family (C, C++, Objective C/C++, OpenCL,
20 CUDA, and RenderScript) for the <a href="http://www.llvm.org/">LLVM</a>
21 project. Both a GCC-compatible compiler driver (<tt>clang</tt>) and an
22 MSVC-compatible compiler driver (<tt>clang-cl.exe</tt>) are provided. You
23 can <a href="get_started.html">get and build</a> the source today.</p>
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]24
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]25 <!--=====================================================================-->
26 <h2 id="goals">Features and Goals</h2>
27 <!--=====================================================================-->
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]28
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]29 <p>Some of the goals for the project include the following:</p>
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]30
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]31 <p><b><a href="features.html#enduser">End-User Features</a></b>:</p>
32
33 <ul>
34 <li>Fast compiles and low memory use</li>
Chris Lattner8fda6742009-03-19 18:58:22 +0000[diff] [blame]35 <li>Expressive diagnostics (<a href="diagnostics.html">examples</a>)</li>
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]36 <li>GCC compatibility</li>
37 </ul>
38
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]39 <p><b><a href="features.html#applications">Utility and
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]40 Applications</a></b>:</p>
41
42 <ul>
43 <li>Modular library based architecture</li>
44 <li>Support diverse clients (refactoring, static analysis, code generation,
Alp Toker344845b2014-01-16 17:04:52 +0000[diff] [blame]45 etc.)</li>
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]46 <li>Allow tight integration with IDEs</li>
47 <li>Use the LLVM 'BSD' License</li>
48 </ul>
49
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]50 <p><b><a href="features.html#design">Internal Design and
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]51 Implementation</a></b>:</p>
52
53 <ul>
54 <li>A real-world, production quality compiler</li>
55 <li>A simple and hackable code base</li>
56 <li>A single unified parser for C, Objective C, C++, and Objective C++</li>
57 <li>Conformance with C/C++/ObjC and their variants</li>
58 </ul>
59
60 <p>Of course this is only a rough outline of the goals and features of
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]61 Clang. To get a true sense of what it is all about, see the <a
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]62 href="features.html">Features</a> section, which breaks
63 each of these down and explains them in more detail.</p>
64
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]65
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]66 <!--=====================================================================-->
67 <h2>Why?</h2>
68 <!--=====================================================================-->
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]69
Alp Toker344845b2014-01-16 17:04:52 +0000[diff] [blame]70 <p>Development of the new front-end was started out of a need
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]71 for a compiler that allows better diagnostics, better integration with
72 IDEs, a license that is compatible with commercial products, and a
73 nimble compiler that is easy to develop and maintain. All of these were
74 motivations for starting work on a new front-end that could
75 meet these needs.</p>
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]76
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]77 <p>For a more detailed comparison between Clang and other compilers, please
Richard Smithd9d42f92018-03-01 22:01:06 +0000[diff] [blame]78 see the <a href="comparison.html">Clang comparison page</a>.</p>
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]79
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]80 <!--=====================================================================-->
81 <h2>Current Status</h2>
82 <!--=====================================================================-->
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]83
Alp Toker344845b2014-01-16 17:04:52 +0000[diff] [blame]84 <p>Clang is considered to
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]85 be a production quality C, Objective-C, C++ and Objective-C++ compiler when
86 targeting X86-32, X86-64, and ARM (other targets may have caveats, but are
Sylvestre Ledru5c3457d2018-09-14 09:08:21 +0000[diff] [blame]87 usually easy to fix). As example, Clang is used in production to build
88 performance-critical software like Chrome or Firefox.<br /> If you are looking
89 for source analysis or source-to-source transformation tools, Clang is probably
90 a great solution for you. Clang supports C++11, C++14 and C++17, please see
91 the <a href="cxx_status.html">C++ status</a> page for more information.</p>
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]92
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]93 <!--=====================================================================-->
94 <h2>Get it and get involved!</h2>
95 <!--=====================================================================-->
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]96
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]97 <p>Start by <a href="get_started.html">getting the code, building it, and
98 playing with it</a>. This will show you the sorts of things we can do
Mandeep Singh Granga2623c82016-02-10 21:06:10 +0000[diff] [blame]99 today and will let you have the "Clang experience" first hand: hopefully
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]100 it will "resonate" with you. :)</p>
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]101
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]102 <p>Once you've done that, please consider <a href="get_involved.html">getting
Richard Smithd9d42f92018-03-01 22:01:06 +0000[diff] [blame]103 involved in the Clang community</a>. The Clang developers include numerous
Sylvestre Ledru29e2a582017-08-25 08:44:56 +0000[diff] [blame]104 volunteer contributors with a variety of backgrounds. If you're
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]105 interested in
Mandeep Singh Granga2623c82016-02-10 21:06:10 +0000[diff] [blame]106 following the development of Clang, signing up for a mailing list is a good
Cedric Venet084381332009-02-14 20:20:19 +0000[diff] [blame]107 way to learn about how the project works.</p>
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