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| <h2 class="chapter">18 Host Configuration</h2> |
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| <p>Most details about the machine and system on which the compiler is |
| actually running are detected by the <code>configure</code> script. Some |
| things are impossible for <code>configure</code> to detect; these are |
| described in two ways, either by macros defined in a file named |
| <samp>xm-<var>machine</var>.h</samp> or by hook functions in the file specified |
| by the <var>out_host_hook_obj</var> variable in <samp>config.gcc</samp>. (The |
| intention is that very few hosts will need a header file but nearly |
| every fully supported host will need to override some hooks.) |
| </p> |
| <p>If you need to define only a few macros, and they have simple |
| definitions, consider using the <code>xm_defines</code> variable in your |
| <samp>config.gcc</samp> entry instead of creating a host configuration |
| header. See <a href="System-Config.html#System-Config">System Config</a>. |
| </p> |
| <table class="menu" border="0" cellspacing="0"> |
| <tr><td align="left" valign="top">• <a href="Host-Common.html#Host-Common" accesskey="1">Host Common</a>:</td><td> </td><td align="left" valign="top">Things every host probably needs implemented. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Filesystem.html#Filesystem" accesskey="2">Filesystem</a>:</td><td> </td><td align="left" valign="top">Your host can’t have the letter ‘a’ in filenames? |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Host-Misc.html#Host-Misc" accesskey="3">Host Misc</a>:</td><td> </td><td align="left" valign="top">Rare configuration options for hosts. |
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