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A GNU Manual
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<h1 class="settitle">Using the GNU Compiler Collection (GCC)</h1>
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<a name="G++-and-GCC"></a>
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<a name="G_002b_002b-and-GCC"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Standards.html#Standards">Standards</a>,
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Previous: <a rel="previous" accesskey="p" href="index.html#Top">Top</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<h2 class="chapter">1 Programming Languages Supported by GCC</h2>
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<p><a name="index-GCC-2"></a><a name="index-GNU-Compiler-Collection-3"></a><a name="index-GNU-C-Compiler-4"></a><a name="index-Ada-5"></a><a name="index-Fortran-6"></a><a name="index-Go-7"></a><a name="index-Java-8"></a><a name="index-Objective_002dC-9"></a><a name="index-Objective_002dC_002b_002b-10"></a>GCC stands for “GNU Compiler Collection”. GCC is an integrated
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distribution of compilers for several major programming languages. These
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languages currently include C, C++, Objective-C, Objective-C++, Java,
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Fortran, Ada, and Go.
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<p>The abbreviation <dfn>GCC</dfn> has multiple meanings in common use. The
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current official meaning is “GNU Compiler Collection”, which refers
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generically to the complete suite of tools. The name historically stood
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for “GNU C Compiler”, and this usage is still common when the emphasis
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is on compiling C programs. Finally, the name is also used when speaking
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of the <dfn>language-independent</dfn> component of GCC: code shared among the
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compilers for all supported languages.
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<p>The language-independent component of GCC includes the majority of the
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optimizers, as well as the “back ends” that generate machine code for
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various processors.
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<p><a name="index-COBOL-11"></a><a name="index-Mercury-12"></a><a name="index-Pascal-13"></a>The part of a compiler that is specific to a particular language is
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called the “front end”. In addition to the front ends that are
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integrated components of GCC, there are several other front ends that
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are maintained separately. These support languages such as Pascal,
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Mercury, and COBOL. To use these, they must be built together with
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GCC proper.
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<p><a name="index-C_002b_002b-14"></a><a name="index-G_002b_002b-15"></a><a name="index-Ada-16"></a><a name="index-GNAT-17"></a>Most of the compilers for languages other than C have their own names.
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The C++ compiler is G++, the Ada compiler is GNAT, and so on. When we
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talk about compiling one of those languages, we might refer to that
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compiler by its own name, or as GCC. Either is correct.
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<p><a name="index-compiler-compared-to-C_002b_002b-preprocessor-18"></a><a name="index-intermediate-C-version_002c-nonexistent-19"></a><a name="index-C-intermediate-output_002c-nonexistent-20"></a>Historically, compilers for many languages, including C++ and Fortran,
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have been implemented as “preprocessors” which emit another high
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level language such as C. None of the compilers included in GCC are
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implemented this way; they all generate machine code directly. This
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sort of preprocessor should not be confused with the <dfn>C
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preprocessor</dfn>, which is an integral feature of the C, C++, Objective-C
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and Objective-C++ languages.
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<!-- Copyright (C) 2000-2015 Free Software Foundation, Inc. -->
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