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<title>Using the GNU Compiler Collection (GCC)</title>
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<h3 class="section">Specifying Target Machine and Compiler Version</h3>
<p>The usual way to run GCC is to run the executable called <code>gcc</code>, or
<code><machine>-gcc</code> when cross-compiling, or
<code><machine>-gcc-<version></code> to run a version other than the one that
was installed last. Sometimes this is inconvenient, so GCC provides
options that will switch to another cross-compiler or version.
<dl>
<dt><code>-b </code><var>machine</var><code></code>
<dd>The argument <var>machine</var> specifies the target machine for compilation.
<p>The value to use for <var>machine</var> is the same as was specified as the
machine type when configuring GCC as a cross-compiler. For
example, if a cross-compiler was configured with <code>configure
i386v</code>, meaning to compile for an 80386 running System V, then you
would specify <code>-b i386v</code> to run that cross compiler.
<br><dt><code>-V </code><var>version</var><code></code>
<dd>The argument <var>version</var> specifies which version of GCC to run.
This is useful when multiple versions are installed. For example,
<var>version</var> might be <code>2.0</code>, meaning to run GCC version 2.0.
</dl>
<p>The <code>-V</code> and <code>-b</code> options work by running the
<code><machine>-gcc-<version></code> executable, so there's no real reason to
use them if you can just run that directly.
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