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<a name="Invoking-G++"></a>
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<a name="Invoking-G_002b_002b"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="C-Dialect-Options.html#C-Dialect-Options">C Dialect Options</a>,
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Previous: <a rel="previous" accesskey="p" href="Overall-Options.html#Overall-Options">Overall Options</a>,
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Up: <a rel="up" accesskey="u" href="Invoking-GCC.html#Invoking-GCC">Invoking GCC</a>
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<h3 class="section">3.3 Compiling C++ Programs</h3>
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<p><a name="index-suffixes-for-C_002b_002b-source-97"></a><a name="index-C_002b_002b-source-file-suffixes-98"></a>C++ source files conventionally use one of the suffixes ‘<samp><span class="samp">.C</span></samp>’,
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‘<samp><span class="samp">.cc</span></samp>’, ‘<samp><span class="samp">.cpp</span></samp>’, ‘<samp><span class="samp">.CPP</span></samp>’, ‘<samp><span class="samp">.c++</span></samp>’, ‘<samp><span class="samp">.cp</span></samp>’, or
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‘<samp><span class="samp">.cxx</span></samp>’; C++ header files often use ‘<samp><span class="samp">.hh</span></samp>’, ‘<samp><span class="samp">.hpp</span></samp>’,
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‘<samp><span class="samp">.H</span></samp>’, or (for shared template code) ‘<samp><span class="samp">.tcc</span></samp>’; and
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preprocessed C++ files use the suffix ‘<samp><span class="samp">.ii</span></samp>’. GCC recognizes
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files with these names and compiles them as C++ programs even if you
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call the compiler the same way as for compiling C programs (usually
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with the name <samp><span class="command">gcc</span></samp>).
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<p><a name="index-g_002b_002b-99"></a><a name="index-c_002b_002b-100"></a>However, the use of <samp><span class="command">gcc</span></samp> does not add the C++ library.
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<samp><span class="command">g++</span></samp> is a program that calls GCC and automatically specifies linking
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against the C++ library. It treats ‘<samp><span class="samp">.c</span></samp>’,
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‘<samp><span class="samp">.h</span></samp>’ and ‘<samp><span class="samp">.i</span></samp>’ files as C++ source files instead of C source
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files unless <samp><span class="option">-x</span></samp> is used. This program is also useful when
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precompiling a C header file with a ‘<samp><span class="samp">.h</span></samp>’ extension for use in C++
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compilations. On many systems, <samp><span class="command">g++</span></samp> is also installed with
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the name <samp><span class="command">c++</span></samp>.
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<p><a name="index-invoking-_0040command_007bg_002b_002b_007d-101"></a>When you compile C++ programs, you may specify many of the same
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command-line options that you use for compiling programs in any
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language; or command-line options meaningful for C and related
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languages; or options that are meaningful only for C++ programs.
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See <a href="C-Dialect-Options.html#C-Dialect-Options">Options Controlling C Dialect</a>, for
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explanations of options for languages related to C.
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See <a href="C_002b_002b-Dialect-Options.html#C_002b_002b-Dialect-Options">Options Controlling C++ Dialect</a>, for
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explanations of options that are meaningful only for C++ programs.
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