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| <h3 class="section">3.3 Compiling C++ Programs</h3> |
| |
| <p><a name="index-suffixes-for-C_002b_002b-source-88"></a><a name="index-C_002b_002b-source-file-suffixes-89"></a>C++ source files conventionally use one of the suffixes ‘<samp><span class="samp">.C</span></samp>’, |
| ‘<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 |
| ‘<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>’, |
| ‘<samp><span class="samp">.H</span></samp>’, or (for shared template code) ‘<samp><span class="samp">.tcc</span></samp>’; and |
| preprocessed C++ files use the suffix ‘<samp><span class="samp">.ii</span></samp>’. GCC recognizes |
| files with these names and compiles them as C++ programs even if you |
| call the compiler the same way as for compiling C programs (usually |
| with the name <samp><span class="command">gcc</span></samp>). |
| |
| <p><a name="index-g_002b_002b-90"></a><a name="index-c_002b_002b-91"></a>However, the use of <samp><span class="command">gcc</span></samp> does not add the C++ library. |
| <samp><span class="command">g++</span></samp> is a program that calls GCC and treats ‘<samp><span class="samp">.c</span></samp>’, |
| ‘<samp><span class="samp">.h</span></samp>’ and ‘<samp><span class="samp">.i</span></samp>’ files as C++ source files instead of C source |
| files unless <samp><span class="option">-x</span></samp> is used, and automatically specifies linking |
| against the C++ library. This program is also useful when |
| precompiling a C header file with a ‘<samp><span class="samp">.h</span></samp>’ extension for use in C++ |
| compilations. On many systems, <samp><span class="command">g++</span></samp> is also installed with |
| the name <samp><span class="command">c++</span></samp>. |
| |
| <p><a name="index-invoking-_0040command_007bg_002b_002b_007d-92"></a>When you compile C++ programs, you may specify many of the same |
| command-line options that you use for compiling programs in any |
| language; or command-line options meaningful for C and related |
| languages; or options that are meaningful only for C++ programs. |
| See <a href="C-Dialect-Options.html#C-Dialect-Options">Options Controlling C Dialect</a>, for |
| explanations of options for languages related to C. |
| See <a href="C_002b_002b-Dialect-Options.html#C_002b_002b-Dialect-Options">Options Controlling C++ Dialect</a>, for |
| explanations of options that are meaningful only for C++ programs. |
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