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<a name="Host-Misc"></a>
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<p>
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> &nbsp; [<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>
<a name="Host-Misc-1"></a>
<h3 class="section">19.3 Host Misc</h3>
<a name="index-configuration-file-1"></a>
<a name="index-xm_002dmachine_002eh-1"></a>

<dl compact="compact">
<dt><code>FATAL_EXIT_CODE</code>
<a name="index-FATAL_005fEXIT_005fCODE"></a>
</dt>
<dd><p>A C expression for the status code to be returned when the compiler
exits after serious errors.  The default is the system-provided macro
&lsquo;<samp>EXIT_FAILURE</samp>&rsquo;, or &lsquo;<samp>1</samp>&rsquo; if the system doesn&rsquo;t define that
macro.  Define this macro only if these defaults are incorrect.
</p>
</dd>
<dt><code>SUCCESS_EXIT_CODE</code>
<a name="index-SUCCESS_005fEXIT_005fCODE"></a>
</dt>
<dd><p>A C expression for the status code to be returned when the compiler
exits without serious errors.  (Warnings are not serious errors.)  The
default is the system-provided macro &lsquo;<samp>EXIT_SUCCESS</samp>&rsquo;, or &lsquo;<samp>0</samp>&rsquo; if
the system doesn&rsquo;t define that macro.  Define this macro only if these
defaults are incorrect.
</p>
</dd>
<dt><code>USE_C_ALLOCA</code>
<a name="index-USE_005fC_005fALLOCA"></a>
</dt>
<dd><p>Define this macro if GCC should use the C implementation of <code>alloca</code>
provided by <samp>libiberty.a</samp>.  This only affects how some parts of the
compiler itself allocate memory.  It does not change code generation.
</p>
<p>When GCC is built with a compiler other than itself, the C <code>alloca</code>
is always used.  This is because most other implementations have serious
bugs.  You should define this macro only on a system where no
stack-based <code>alloca</code> can possibly work.  For instance, if a system
has a small limit on the size of the stack, GCC&rsquo;s builtin <code>alloca</code>
will not work reliably.
</p>
</dd>
<dt><code>COLLECT2_HOST_INITIALIZATION</code>
<a name="index-COLLECT2_005fHOST_005fINITIALIZATION"></a>
</dt>
<dd><p>If defined, a C statement (sans semicolon) that performs host-dependent
initialization when <code>collect2</code> is being initialized.
</p>
</dd>
<dt><code>GCC_DRIVER_HOST_INITIALIZATION</code>
<a name="index-GCC_005fDRIVER_005fHOST_005fINITIALIZATION"></a>
</dt>
<dd><p>If defined, a C statement (sans semicolon) that performs host-dependent
initialization when a compilation driver is being initialized.
</p>
</dd>
<dt><code>HOST_LONG_LONG_FORMAT</code>
<a name="index-HOST_005fLONG_005fLONG_005fFORMAT"></a>
</dt>
<dd><p>If defined, the string used to indicate an argument of type <code>long
long</code> to functions like <code>printf</code>.  The default value is
<code>&quot;ll&quot;</code>.
</p>
</dd>
<dt><code>HOST_LONG_FORMAT</code>
<a name="index-HOST_005fLONG_005fFORMAT"></a>
</dt>
<dd><p>If defined, the string used to indicate an argument of type <code>long</code>
to functions like <code>printf</code>.  The default value is <code>&quot;l&quot;</code>.
</p>
</dd>
<dt><code>HOST_PTR_PRINTF</code>
<a name="index-HOST_005fPTR_005fPRINTF"></a>
</dt>
<dd><p>If defined, the string used to indicate an argument of type <code>void *</code>
to functions like <code>printf</code>.  The default value is <code>&quot;%p&quot;</code>.
</p></dd>
</dl>

<p>In addition, if <code>configure</code> generates an incorrect definition of
any of the macros in <samp>auto-host.h</samp>, you can override that
definition in a host configuration header.  If you need to do this,
first see if it is possible to fix <code>configure</code>.
</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> &nbsp; [<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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