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<title>Invoking GCC - Using the GNU Compiler Collection (GCC)</title>
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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<a name="Invoking-GCC"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="C-Implementation.html#C-Implementation">C Implementation</a>,
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Previous: <a rel="previous" accesskey="p" href="Standards.html#Standards">Standards</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<h2 class="chapter">3 GCC Command Options</h2>
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<p><a name="index-GCC-command-options-67"></a><a name="index-command-options-68"></a><a name="index-options_002c-GCC-command-69"></a>
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<!-- man begin DESCRIPTION -->
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When you invoke GCC, it normally does preprocessing, compilation,
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assembly and linking. The “overall options” allow you to stop this
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process at an intermediate stage. For example, the <samp><span class="option">-c</span></samp> option
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says not to run the linker. Then the output consists of object files
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output by the assembler.
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<p>Other options are passed on to one stage of processing. Some options
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control the preprocessor and others the compiler itself. Yet other
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options control the assembler and linker; most of these are not
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documented here, since you rarely need to use any of them.
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<p><a name="index-C-compilation-options-70"></a>Most of the command-line options that you can use with GCC are useful
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for C programs; when an option is only useful with another language
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(usually C++), the explanation says so explicitly. If the description
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for a particular option does not mention a source language, you can use
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that option with all supported languages.
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<p><a name="index-C_002b_002b-compilation-options-71"></a>See <a href="Invoking-G_002b_002b.html#Invoking-G_002b_002b">Compiling C++ Programs</a>, for a summary of special
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options for compiling C++ programs.
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<p><a name="index-grouping-options-72"></a><a name="index-options_002c-grouping-73"></a>The <samp><span class="command">gcc</span></samp> program accepts options and file names as operands. Many
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options have multi-letter names; therefore multiple single-letter options
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may <em>not</em> be grouped: <samp><span class="option">-dv</span></samp> is very different from ‘<samp><span class="samp">-d -v</span></samp>’<!-- /@w -->.
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<p><a name="index-order-of-options-74"></a><a name="index-options_002c-order-75"></a>You can mix options and other arguments. For the most part, the order
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you use doesn't matter. Order does matter when you use several
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options of the same kind; for example, if you specify <samp><span class="option">-L</span></samp> more
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than once, the directories are searched in the order specified. Also,
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the placement of the <samp><span class="option">-l</span></samp> option is significant.
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<p>Many options have long names starting with ‘<samp><span class="samp">-f</span></samp>’ or with
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‘<samp><span class="samp">-W</span></samp>’—for example,
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<samp><span class="option">-fmove-loop-invariants</span></samp>, <samp><span class="option">-Wformat</span></samp> and so on. Most of
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these have both positive and negative forms; the negative form of
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<samp><span class="option">-ffoo</span></samp> is <samp><span class="option">-fno-foo</span></samp>. This manual documents
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only one of these two forms, whichever one is not the default.
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<!-- man end -->
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<p>See <a href="Option-Index.html#Option-Index">Option Index</a>, for an index to GCC's options.
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<ul class="menu">
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<li><a accesskey="1" href="Option-Summary.html#Option-Summary">Option Summary</a>: Brief list of all options, without explanations.
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<li><a accesskey="2" href="Overall-Options.html#Overall-Options">Overall Options</a>: Controlling the kind of output:
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an executable, object files, assembler files,
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or preprocessed source.
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<li><a accesskey="3" href="Invoking-G_002b_002b.html#Invoking-G_002b_002b">Invoking G++</a>: Compiling C++ programs.
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<li><a accesskey="4" href="C-Dialect-Options.html#C-Dialect-Options">C Dialect Options</a>: Controlling the variant of C language compiled.
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<li><a accesskey="5" href="C_002b_002b-Dialect-Options.html#C_002b_002b-Dialect-Options">C++ Dialect Options</a>: Variations on C++.
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<li><a accesskey="6" href="Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options.html#Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options">Objective-C and Objective-C++ Dialect Options</a>: Variations on Objective-C
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and Objective-C++.
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<li><a accesskey="7" href="Language-Independent-Options.html#Language-Independent-Options">Language Independent Options</a>: Controlling how diagnostics should be
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formatted.
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<li><a accesskey="8" href="Warning-Options.html#Warning-Options">Warning Options</a>: How picky should the compiler be?
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<li><a accesskey="9" href="Debugging-Options.html#Debugging-Options">Debugging Options</a>: Symbol tables, measurements, and debugging dumps.
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<li><a href="Optimize-Options.html#Optimize-Options">Optimize Options</a>: How much optimization?
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<li><a href="Preprocessor-Options.html#Preprocessor-Options">Preprocessor Options</a>: Controlling header files and macro definitions.
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Also, getting dependency information for Make.
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<li><a href="Assembler-Options.html#Assembler-Options">Assembler Options</a>: Passing options to the assembler.
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<li><a href="Link-Options.html#Link-Options">Link Options</a>: Specifying libraries and so on.
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<li><a href="Directory-Options.html#Directory-Options">Directory Options</a>: Where to find header files and libraries.
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Where to find the compiler executable files.
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<li><a href="Spec-Files.html#Spec-Files">Spec Files</a>: How to pass switches to sub-processes.
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<li><a href="Target-Options.html#Target-Options">Target Options</a>: Running a cross-compiler, or an old version of GCC.
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<li><a href="Submodel-Options.html#Submodel-Options">Submodel Options</a>: Specifying minor hardware or convention variations,
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such as 68010 vs 68020.
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<li><a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a>: Specifying conventions for function calls, data layout
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and register usage.
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<li><a href="Environment-Variables.html#Environment-Variables">Environment Variables</a>: Env vars that affect GCC.
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<li><a href="Precompiled-Headers.html#Precompiled-Headers">Precompiled Headers</a>: Compiling a header once, and using it many times.
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</ul>
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<!-- man begin OPTIONS -->
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</body></html>
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