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| <title>Using the GNU Compiler Collection (GCC): Invoking GCC</title> |
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| <a name="Invoking-GCC"></a> |
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| Next: <a href="C-Implementation.html#C-Implementation" accesskey="n" rel="next">C Implementation</a>, Previous: <a href="Standards.html#Standards" accesskey="p" rel="prev">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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| <a name="GCC-Command-Options"></a> |
| <h2 class="chapter">3 GCC Command Options</h2> |
| <a name="index-GCC-command-options"></a> |
| <a name="index-command-options"></a> |
| <a name="index-options_002c-GCC-command"></a> |
| |
| <p>When you invoke GCC, it normally does preprocessing, compilation, |
| assembly and linking. The “overall options” allow you to stop this |
| process at an intermediate stage. For example, the <samp>-c</samp> option |
| says not to run the linker. Then the output consists of object files |
| output by the assembler. |
| </p> |
| <p>Other options are passed on to one stage of processing. Some options |
| control the preprocessor and others the compiler itself. Yet other |
| options control the assembler and linker; most of these are not |
| documented here, since you rarely need to use any of them. |
| </p> |
| <a name="index-C-compilation-options"></a> |
| <p>Most of the command-line options that you can use with GCC are useful |
| for C programs; when an option is only useful with another language |
| (usually C++), the explanation says so explicitly. If the description |
| for a particular option does not mention a source language, you can use |
| that option with all supported languages. |
| </p> |
| <a name="index-C_002b_002b-compilation-options"></a> |
| <p>See <a href="Invoking-G_002b_002b.html#Invoking-G_002b_002b">Compiling C++ Programs</a>, for a summary of special |
| options for compiling C++ programs. |
| </p> |
| <a name="index-grouping-options"></a> |
| <a name="index-options_002c-grouping"></a> |
| <p>The <code>gcc</code> program accepts options and file names as operands. Many |
| options have multi-letter names; therefore multiple single-letter options |
| may <em>not</em> be grouped: <samp>-dv</samp> is very different from ‘<samp><span class="nolinebreak">-d</span> <span class="nolinebreak">-v</span></samp>’<!-- /@w -->. |
| </p> |
| <a name="index-order-of-options"></a> |
| <a name="index-options_002c-order"></a> |
| <p>You can mix options and other arguments. For the most part, the order |
| you use doesn’t matter. Order does matter when you use several |
| options of the same kind; for example, if you specify <samp>-L</samp> more |
| than once, the directories are searched in the order specified. Also, |
| the placement of the <samp>-l</samp> option is significant. |
| </p> |
| <p>Many options have long names starting with ‘<samp>-f</samp>’ or with |
| ‘<samp>-W</samp>’—for example, |
| <samp>-fmove-loop-invariants</samp>, <samp>-Wformat</samp> and so on. Most of |
| these have both positive and negative forms; the negative form of |
| <samp>-ffoo</samp> is <samp>-fno-foo</samp>. This manual documents |
| only one of these two forms, whichever one is not the default. |
| </p> |
| |
| <p>See <a href="Option-Index.html#Option-Index">Option Index</a>, for an index to GCC’s options. |
| </p> |
| <table class="menu" border="0" cellspacing="0"> |
| <tr><td align="left" valign="top">• <a href="Option-Summary.html#Option-Summary" accesskey="1">Option Summary</a>:</td><td> </td><td align="left" valign="top">Brief list of all options, without explanations. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Overall-Options.html#Overall-Options" accesskey="2">Overall Options</a>:</td><td> </td><td align="left" valign="top">Controlling the kind of output: |
| an executable, object files, assembler files, |
| or preprocessed source. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Invoking-G_002b_002b.html#Invoking-G_002b_002b" accesskey="3">Invoking G++</a>:</td><td> </td><td align="left" valign="top">Compiling C++ programs. |
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| <tr><td align="left" valign="top">• <a href="C-Dialect-Options.html#C-Dialect-Options" accesskey="4">C Dialect Options</a>:</td><td> </td><td align="left" valign="top">Controlling the variant of C language compiled. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="C_002b_002b-Dialect-Options.html#C_002b_002b-Dialect-Options" accesskey="5">C++ Dialect Options</a>:</td><td> </td><td align="left" valign="top">Variations on C++. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options.html#Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options" accesskey="6">Objective-C and Objective-C++ Dialect Options</a>:</td><td> </td><td align="left" valign="top">Variations on Objective-C |
| and Objective-C++. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Language-Independent-Options.html#Language-Independent-Options" accesskey="7">Language Independent Options</a>:</td><td> </td><td align="left" valign="top">Controlling how diagnostics should be |
| formatted. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Warning-Options.html#Warning-Options" accesskey="8">Warning Options</a>:</td><td> </td><td align="left" valign="top">How picky should the compiler be? |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Debugging-Options.html#Debugging-Options" accesskey="9">Debugging Options</a>:</td><td> </td><td align="left" valign="top">Symbol tables, measurements, and debugging dumps. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Optimize-Options.html#Optimize-Options">Optimize Options</a>:</td><td> </td><td align="left" valign="top">How much optimization? |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Preprocessor-Options.html#Preprocessor-Options">Preprocessor Options</a>:</td><td> </td><td align="left" valign="top">Controlling header files and macro definitions. |
| Also, getting dependency information for Make. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Assembler-Options.html#Assembler-Options">Assembler Options</a>:</td><td> </td><td align="left" valign="top">Passing options to the assembler. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Link-Options.html#Link-Options">Link Options</a>:</td><td> </td><td align="left" valign="top">Specifying libraries and so on. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Directory-Options.html#Directory-Options">Directory Options</a>:</td><td> </td><td align="left" valign="top">Where to find header files and libraries. |
| Where to find the compiler executable files. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Spec-Files.html#Spec-Files">Spec Files</a>:</td><td> </td><td align="left" valign="top">How to pass switches to sub-processes. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Target-Options.html#Target-Options">Target Options</a>:</td><td> </td><td align="left" valign="top">Running a cross-compiler, or an old version of GCC. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Submodel-Options.html#Submodel-Options">Submodel Options</a>:</td><td> </td><td align="left" valign="top">Specifying minor hardware or convention variations, |
| such as 68010 vs 68020. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a>:</td><td> </td><td align="left" valign="top">Specifying conventions for function calls, data layout |
| and register usage. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Environment-Variables.html#Environment-Variables">Environment Variables</a>:</td><td> </td><td align="left" valign="top">Env vars that affect GCC. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Precompiled-Headers.html#Precompiled-Headers">Precompiled Headers</a>:</td><td> </td><td align="left" valign="top">Compiling a header once, and using it many times. |
| </td></tr> |
| </table> |
| |
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| Next: <a href="C-Implementation.html#C-Implementation" accesskey="n" rel="next">C Implementation</a>, Previous: <a href="Standards.html#Standards" accesskey="p" rel="prev">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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