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101 lines
4.8 KiB
HTML
101 lines
4.8 KiB
HTML
4 years ago
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<title>PCH Target - GNU Compiler Collection (GCC) Internals</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Target-Macros.html#Target-Macros" title="Target Macros">
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<link rel="prev" href="MIPS-Coprocessors.html#MIPS-Coprocessors" title="MIPS Coprocessors">
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<link rel="next" href="C_002b_002b-ABI.html#C_002b_002b-ABI" title="C++ ABI">
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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</head>
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<body>
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<div class="node">
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<a name="PCH-Target"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="C_002b_002b-ABI.html#C_002b_002b-ABI">C++ ABI</a>,
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Previous: <a rel="previous" accesskey="p" href="MIPS-Coprocessors.html#MIPS-Coprocessors">MIPS Coprocessors</a>,
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Up: <a rel="up" accesskey="u" href="Target-Macros.html#Target-Macros">Target Macros</a>
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<hr>
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</div>
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<h3 class="section">17.27 Parameters for Precompiled Header Validity Checking</h3>
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<p><a name="index-parameters_002c-precompiled-headers-4863"></a>
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<div class="defun">
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— Target Hook: void * <b>TARGET_GET_PCH_VALIDITY</b> (<var>size_t *sz</var>)<var><a name="index-TARGET_005fGET_005fPCH_005fVALIDITY-4864"></a></var><br>
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<blockquote><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><span class="samp">*</span><var>sz</var></samp>’ to the size of the data in bytes.
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</p></blockquote></div>
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<div class="defun">
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— Target Hook: const char * <b>TARGET_PCH_VALID_P</b> (<var>const void *data, size_t sz</var>)<var><a name="index-TARGET_005fPCH_005fVALID_005fP-4865"></a></var><br>
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<blockquote><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><span class="samp">_(</span><var>msg</var><span class="samp">)</span></samp>’.
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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>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></blockquote></div>
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<div class="defun">
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— Target Hook: const char * <b>TARGET_CHECK_PCH_TARGET_FLAGS</b> (<var>int pch_flags</var>)<var><a name="index-TARGET_005fCHECK_005fPCH_005fTARGET_005fFLAGS-4866"></a></var><br>
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<blockquote><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></blockquote></div>
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<div class="defun">
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— Target Hook: void <b>TARGET_PREPARE_PCH_SAVE</b> (<var>void</var>)<var><a name="index-TARGET_005fPREPARE_005fPCH_005fSAVE-4867"></a></var><br>
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<blockquote><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></blockquote></div>
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</body></html>
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