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| <a name="Fixed-Header-Files"></a> |
| <h3 class="section">11.4 Fixed Header Files</h3> |
| |
| <p>GCC needs to install corrected versions of some system header files. |
| This is because most target systems have some header files that won’t |
| work with GCC unless they are changed. Some have bugs, some are |
| incompatible with ISO C, and some depend on special features of other |
| compilers. |
| </p> |
| <p>Installing GCC automatically creates and installs the fixed header |
| files, by running a program called <code>fixincludes</code>. Normally, you |
| don’t need to pay attention to this. But there are cases where it |
| doesn’t do the right thing automatically. |
| </p> |
| <ul> |
| <li> If you update the system’s header files, such as by installing a new |
| system version, the fixed header files of GCC are not automatically |
| updated. They can be updated using the <code>mkheaders</code> script |
| installed in |
| <samp><var>libexecdir</var>/gcc/<var>target</var>/<var>version</var>/install-tools/</samp>. |
| |
| </li><li> On some systems, header file directories contain |
| machine-specific symbolic links in certain places. This makes it |
| possible to share most of the header files among hosts running the |
| same version of the system on different machine models. |
| |
| <p>The programs that fix the header files do not understand this special |
| way of using symbolic links; therefore, the directory of fixed header |
| files is good only for the machine model used to build it. |
| </p> |
| <p>It is possible to make separate sets of fixed header files for the |
| different machine models, and arrange a structure of symbolic links so |
| as to use the proper set, but you’ll have to do this by hand. |
| </p></li></ul> |
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