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<h3 class="section">3.16 Specifying Target Machine and Compiler Version</h3>

<p><a name="index-target-options-979"></a><a name="index-cross-compiling-980"></a><a name="index-specifying-machine-version-981"></a><a name="index-specifying-compiler-version-and-target-machine-982"></a><a name="index-compiler-version_002c-specifying-983"></a><a name="index-target-machine_002c-specifying-984"></a>
The usual way to run GCC is to run the executable called <samp><span class="file">gcc</span></samp>, or
<samp><span class="file">&lt;machine&gt;-gcc</span></samp> when cross-compiling, or
<samp><span class="file">&lt;machine&gt;-gcc-&lt;version&gt;</span></samp> 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><dd><a name="index-b-985"></a>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 &lsquo;<samp><span class="samp">configure
arm-elf</span></samp>&rsquo;, meaning to compile for an arm processor with elf binaries,
then you would specify <samp><span class="option">-b arm-elf</span></samp> to run that cross compiler. 
Because there are other options beginning with <samp><span class="option">-b</span></samp>, the
configuration must contain a hyphen, or <samp><span class="option">-b</span></samp> alone should be one
argument followed by the configuration in the next argument.

     <br><dt><code>-V </code><var>version</var><dd><a name="index-V-986"></a>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 &lsquo;<samp><span class="samp">4.0</span></samp>&rsquo;, meaning to run GCC version 4.0. 
</dl>

 <p>The <samp><span class="option">-V</span></samp> and <samp><span class="option">-b</span></samp> options work by running the
<samp><span class="file">&lt;machine&gt;-gcc-&lt;version&gt;</span></samp> executable, so there's no real reason to
use them if you can just run that directly.

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