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<title>Using the GNU Compiler Collection (GCC): G++ and GCC</title>
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<a name="G_002b_002b-and-GCC"></a>
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<div class="header">
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<p>
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Next: <a href="Standards.html#Standards" accesskey="n" rel="next">Standards</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Programming-Languages-Supported-by-GCC"></a>
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<h2 class="chapter">1 Programming Languages Supported by GCC</h2>
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<a name="index-GCC"></a>
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<a name="index-GNU-Compiler-Collection"></a>
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<a name="index-GNU-C-Compiler"></a>
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<a name="index-Ada"></a>
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<a name="index-Fortran"></a>
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<a name="index-Go"></a>
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<a name="index-Java"></a>
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<a name="index-Objective_002dC"></a>
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<a name="index-Objective_002dC_002b_002b"></a>
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<p>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>
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<p>The abbreviation <em>GCC</em> 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 <em>language-independent</em> component of GCC: code shared among the
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compilers for all supported languages.
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</p>
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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>
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<a name="index-COBOL"></a>
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<a name="index-Mercury"></a>
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<a name="index-Pascal"></a>
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<p>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>
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<a name="index-C_002b_002b"></a>
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<a name="index-G_002b_002b"></a>
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<a name="index-Ada-1"></a>
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<a name="index-GNAT"></a>
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<p>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>
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<a name="index-compiler-compared-to-C_002b_002b-preprocessor"></a>
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<a name="index-intermediate-C-version_002c-nonexistent"></a>
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<a name="index-C-intermediate-output_002c-nonexistent"></a>
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<p>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 <em>C
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preprocessor</em>, which is an integral feature of the C, C++, Objective-C
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and Objective-C++ languages.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Standards.html#Standards" accesskey="n" rel="next">Standards</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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