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<title>GNU Compiler Collection (GCC) Internals: PCH Target</title>
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<a name="PCH-Target"></a>
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<div class="header">
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<p>
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Next: <a href="C_002b_002b-ABI.html#C_002b_002b-ABI" accesskey="n" rel="next">C++ ABI</a>, Previous: <a href="MIPS-Coprocessors.html#MIPS-Coprocessors" accesskey="p" rel="prev">MIPS Coprocessors</a>, Up: <a href="Target-Macros.html#Target-Macros" accesskey="u" rel="up">Target Macros</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Parameters-for-Precompiled-Header-Validity-Checking"></a>
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<h3 class="section">17.27 Parameters for Precompiled Header Validity Checking</h3>
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<a name="index-parameters_002c-precompiled-headers"></a>
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<dl>
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<dt><a name="index-TARGET_005fGET_005fPCH_005fVALIDITY"></a>Target Hook: <em>void *</em> <strong>TARGET_GET_PCH_VALIDITY</strong> <em>(size_t *<var>sz</var>)</em></dt>
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<dd><p>This hook returns a pointer to the data needed by
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<code>TARGET_PCH_VALID_P</code> and sets
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‘<samp>*<var>sz</var></samp>’ to the size of the data in bytes.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fPCH_005fVALID_005fP"></a>Target Hook: <em>const char *</em> <strong>TARGET_PCH_VALID_P</strong> <em>(const void *<var>data</var>, size_t <var>sz</var>)</em></dt>
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<dd><p>This hook checks whether the options used to create a PCH file are
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compatible with the current settings. It returns <code>NULL</code>
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if so and a suitable error message if not. Error messages will
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be presented to the user and must be localized using ‘<samp>_(<var>msg</var>)</samp>’.
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</p>
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<p><var>data</var> is the data that was returned by <code>TARGET_GET_PCH_VALIDITY</code>
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when the PCH file was created and <var>sz</var> is the size of that data in bytes.
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It’s safe to assume that the data was created by the same version of the
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compiler, so no format checking is needed.
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</p>
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<p>The default definition of <code>default_pch_valid_p</code> should be
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suitable for most targets.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fCHECK_005fPCH_005fTARGET_005fFLAGS"></a>Target Hook: <em>const char *</em> <strong>TARGET_CHECK_PCH_TARGET_FLAGS</strong> <em>(int <var>pch_flags</var>)</em></dt>
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<dd><p>If this hook is nonnull, the default implementation of
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<code>TARGET_PCH_VALID_P</code> will use it to check for compatible values
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of <code>target_flags</code>. <var>pch_flags</var> specifies the value that
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<code>target_flags</code> had when the PCH file was created. The return
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value is the same as for <code>TARGET_PCH_VALID_P</code>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-TARGET_005fPREPARE_005fPCH_005fSAVE"></a>Target Hook: <em>void</em> <strong>TARGET_PREPARE_PCH_SAVE</strong> <em>(void)</em></dt>
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<dd><p>Called before writing out a PCH file. If the target has some
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garbage-collected data that needs to be in a particular state on PCH loads,
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it can use this hook to enforce that state. Very few targets need
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to do anything here.
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</p></dd></dl>
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<p>
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Next: <a href="C_002b_002b-ABI.html#C_002b_002b-ABI" accesskey="n" rel="next">C++ ABI</a>, Previous: <a href="MIPS-Coprocessors.html#MIPS-Coprocessors" accesskey="p" rel="prev">MIPS Coprocessors</a>, Up: <a href="Target-Macros.html#Target-Macros" accesskey="u" rel="up">Target Macros</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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