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<h3 class="section">18.3 Host Misc</h3>
<p><a name="index-configuration-file-5042"></a><a name="index-g_t_0040file_007bxm_002d_0040var_007bmachine_007d_002eh_007d-5043"></a>
<dl>
<dt><code>FATAL_EXIT_CODE</code><a name="index-FATAL_005fEXIT_005fCODE-5044"></a><dd>A C expression for the status code to be returned when the compiler
exits after serious errors. The default is the system-provided macro
‘<samp><span class="samp">EXIT_FAILURE</span></samp>’, or ‘<samp><span class="samp">1</span></samp>’ if the system doesn't define that
macro. Define this macro only if these defaults are incorrect.
<br><dt><code>SUCCESS_EXIT_CODE</code><a name="index-SUCCESS_005fEXIT_005fCODE-5045"></a><dd>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 ‘<samp><span class="samp">EXIT_SUCCESS</span></samp>’, or ‘<samp><span class="samp">0</span></samp>’ if
the system doesn't define that macro. Define this macro only if these
defaults are incorrect.
<br><dt><code>USE_C_ALLOCA</code><a name="index-USE_005fC_005fALLOCA-5046"></a><dd>Define this macro if GCC should use the C implementation of <code>alloca</code>
provided by <samp><span class="file">libiberty.a</span></samp>. This only affects how some parts of the
compiler itself allocate memory. It does not change code generation.
<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's builtin <code>alloca</code>
will not work reliably.
<br><dt><code>COLLECT2_HOST_INITIALIZATION</code><a name="index-COLLECT2_005fHOST_005fINITIALIZATION-5047"></a><dd>If defined, a C statement (sans semicolon) that performs host-dependent
initialization when <code>collect2</code> is being initialized.
<br><dt><code>GCC_DRIVER_HOST_INITIALIZATION</code><a name="index-GCC_005fDRIVER_005fHOST_005fINITIALIZATION-5048"></a><dd>If defined, a C statement (sans semicolon) that performs host-dependent
initialization when a compilation driver is being initialized.
<br><dt><code>HOST_LONG_LONG_FORMAT</code><a name="index-HOST_005fLONG_005fLONG_005fFORMAT-5049"></a><dd>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>"ll"</code>.
<br><dt><code>HOST_LONG_FORMAT</code><a name="index-HOST_005fLONG_005fFORMAT-5050"></a><dd>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>"l"</code>.
<br><dt><code>HOST_PTR_PRINTF</code><a name="index-HOST_005fPTR_005fPRINTF-5051"></a><dd>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>"%p"</code>.
</dl>
<p>In addition, if <samp><span class="command">configure</span></samp> generates an incorrect definition of
any of the macros in <samp><span class="file">auto-host.h</span></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 <samp><span class="command">configure</span></samp>.
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