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<title>GNU Compiler Collection (GCC) Internals: Host Misc</title>
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<a name="Host-Misc"></a>
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<p>
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Previous: <a href="Filesystem.html#Filesystem" accesskey="p" rel="prev">Filesystem</a>, Up: <a href="Host-Config.html#Host-Config" accesskey="u" rel="up">Host Config</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="Host-Misc-1"></a>
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<h3 class="section">18.3 Host Misc</h3>
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<a name="index-configuration-file-1"></a>
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<a name="index-xm_002dmachine_002eh-1"></a>
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<dl compact="compact">
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<dt><code>FATAL_EXIT_CODE</code>
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<a name="index-FATAL_005fEXIT_005fCODE"></a>
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</dt>
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<dd><p>A C expression for the status code to be returned when the compiler
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exits after serious errors. The default is the system-provided macro
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‘<samp>EXIT_FAILURE</samp>’, or ‘<samp>1</samp>’ if the system doesn’t define that
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macro. Define this macro only if these defaults are incorrect.
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</p>
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</dd>
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<dt><code>SUCCESS_EXIT_CODE</code>
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<a name="index-SUCCESS_005fEXIT_005fCODE"></a>
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</dt>
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<dd><p>A C expression for the status code to be returned when the compiler
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exits without serious errors. (Warnings are not serious errors.) The
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default is the system-provided macro ‘<samp>EXIT_SUCCESS</samp>’, or ‘<samp>0</samp>’ if
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the system doesn’t define that macro. Define this macro only if these
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defaults are incorrect.
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</p>
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</dd>
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<dt><code>USE_C_ALLOCA</code>
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<a name="index-USE_005fC_005fALLOCA"></a>
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</dt>
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<dd><p>Define this macro if GCC should use the C implementation of <code>alloca</code>
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provided by <samp>libiberty.a</samp>. This only affects how some parts of the
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compiler itself allocate memory. It does not change code generation.
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</p>
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<p>When GCC is built with a compiler other than itself, the C <code>alloca</code>
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is always used. This is because most other implementations have serious
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bugs. You should define this macro only on a system where no
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stack-based <code>alloca</code> can possibly work. For instance, if a system
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has a small limit on the size of the stack, GCC’s builtin <code>alloca</code>
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will not work reliably.
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</p>
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</dd>
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<dt><code>COLLECT2_HOST_INITIALIZATION</code>
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<a name="index-COLLECT2_005fHOST_005fINITIALIZATION"></a>
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</dt>
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<dd><p>If defined, a C statement (sans semicolon) that performs host-dependent
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initialization when <code>collect2</code> is being initialized.
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</p>
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</dd>
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<dt><code>GCC_DRIVER_HOST_INITIALIZATION</code>
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<a name="index-GCC_005fDRIVER_005fHOST_005fINITIALIZATION"></a>
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</dt>
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<dd><p>If defined, a C statement (sans semicolon) that performs host-dependent
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initialization when a compilation driver is being initialized.
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</p>
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</dd>
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<dt><code>HOST_LONG_LONG_FORMAT</code>
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<a name="index-HOST_005fLONG_005fLONG_005fFORMAT"></a>
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</dt>
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<dd><p>If defined, the string used to indicate an argument of type <code>long
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long</code> to functions like <code>printf</code>. The default value is
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<code>"ll"</code>.
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</p>
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</dd>
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<dt><code>HOST_LONG_FORMAT</code>
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<a name="index-HOST_005fLONG_005fFORMAT"></a>
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</dt>
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<dd><p>If defined, the string used to indicate an argument of type <code>long</code>
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to functions like <code>printf</code>. The default value is <code>"l"</code>.
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</p>
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</dd>
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<dt><code>HOST_PTR_PRINTF</code>
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<a name="index-HOST_005fPTR_005fPRINTF"></a>
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</dt>
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<dd><p>If defined, the string used to indicate an argument of type <code>void *</code>
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to functions like <code>printf</code>. The default value is <code>"%p"</code>.
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</p></dd>
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</dl>
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<p>In addition, if <code>configure</code> generates an incorrect definition of
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any of the macros in <samp>auto-host.h</samp>, you can override that
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definition in a host configuration header. If you need to do this,
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first see if it is possible to fix <code>configure</code>.
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</p>
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<hr>
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<div class="header">
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<p>
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Previous: <a href="Filesystem.html#Filesystem" accesskey="p" rel="prev">Filesystem</a>, Up: <a href="Host-Config.html#Host-Config" accesskey="u" rel="up">Host Config</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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