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<h2 class="chapter">1 Invoking gccgo</h2>
<!-- man title gccgo A GCC-based compiler for the Go language -->
<!-- man begin DESCRIPTION gccgo -->
<p>The <samp><span class="command">gccgo</span></samp> command is a frontend to <samp><span class="command">gcc</span></samp> and
supports many of the same options. See <a href="../gcc/Option-Summary.html#Option-Summary">Option Summary</a>. This manual
only documents the options specific to <samp><span class="command">gccgo</span></samp>.
<p>The <samp><span class="command">gccgo</span></samp> command may be used to compile Go source code into
an object file, link a collection of object files together, or do both
in sequence.
<p>Go source code is compiled as packages. A package consists of one or
more Go source files. All the files in a single package must be
compiled together, by passing all the files as arguments to
<samp><span class="command">gccgo</span></samp>. A single invocation of <samp><span class="command">gccgo</span></samp> may only
compile a single package.
<p>One Go package may <code>import</code> a different Go package. The imported
package must have already been compiled; <samp><span class="command">gccgo</span></samp> will read
the import data directly from the compiled package. When this package
is later linked, the compiled form of the package must be included in
the link command.
<!-- man end -->
<!-- man begin OPTIONS gccgo -->
<dl>
<dt><code>-I</code><var>dir</var><dd><a name="index-g_t_0040option_007b_002dI_007d-2"></a>Specify a directory to use when searching for an import package at
compile time.
<br><dt><code>-L</code><var>dir</var><dd><a name="index-g_t_0040option_007b_002dL_007d-3"></a>When linking, specify a library search directory, as with
<samp><span class="command">gcc</span></samp>.
<br><dt><code>-fgo-prefix=</code><var>string</var><dd><a name="index-g_t_0040option_007b_002dfgo_002dprefix_007d-4"></a>Go permits a single program to include more than one package with the
same name. This option is required to make this work with
<samp><span class="command">gccgo</span></samp>. The argument to this option may be any string. Each
package with the same name must use a distinct <samp><span class="option">-fgo-prefix</span></samp>
option. The argument is typically the full path under which the
package will be installed, as that must obviously be unique.
<br><dt><code>-frequire-return-statement</code><dt><code>-fno-require-return-statement</code><dd><a name="index-g_t_0040option_007b_002dfrequire_002dreturn_002dstatement_007d-5"></a><a name="index-g_t_0040option_007b_002dfno_002drequire_002dreturn_002dstatement_007d-6"></a>By default <samp><span class="command">gccgo</span></samp> will warn about functions which have one or
more return parameters but lack an explicit <code>return</code> statement.
This warning may be disabled using
<samp><span class="option">-fno-require-return-statement</span></samp>.
</dl>
<!-- man end -->
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