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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"><machine>-gcc</span></samp> when cross-compiling, or |
| <samp><span class="file"><machine>-gcc-<version></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 ‘<samp><span class="samp">configure |
| arm-elf</span></samp>’, 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 ‘<samp><span class="samp">4.0</span></samp>’, 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"><machine>-gcc-<version></span></samp> executable, so there's no real reason to |
| use them if you can just run that directly. |
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