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Autoconf Macro: ac_define_integer_bits
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<h1>
ac_define_integer_bits
</h1>
<h2>
SYNOPSIS
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_DEFINE_INTEGER_BITS (TYPE [, CANDIDATE-TYPE]...)</code>
</p>
<h2>
DESCRIPTION
</h2>
<div class="indent">
<p>
Given a TYPE of the form "int##_t" or "uint##_t", see if the datatype TYPE
is predefined. If not, then define TYPE -- both with AC_DEFINE and as a
shell variable -- to the first datatype of exactly ## bits in a list of
CANDIDATE-TYPEs. If none of the CANDIDATE-TYPEs contains exactly ## bits,
then set the TYPE shell variable to "no".
</p>
<p>
For example, the following ensures that uint64_t is defined as a 64-bit
datatype:
</p>
<pre>
AC_DEFINE_INTEGER_BITS(uint64_t, unsigned long long, unsigned __int64, long)
if test "$uint64_t" = no; then
AC_MSG_ERROR([unable to continue without a 64-bit datatype])
fi
</pre>
<p>
You should then put the following in your C code to ensure that all
datatypes defined by AC_DEFINE_INTEGER_BITS are visible to your program:
</p>
<pre>
#include "config.h"
#if HAVE_INTTYPES_H
# include <inttypes.h>
#else
# if HAVE_STDINT_H
# include <stdint.h>
# endif
#endif
</pre>
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<h2>
SOURCE CODE
</h2>
<p class="indent">
<a href=
"http://autoconf-archive.cryp.to/ac_define_integer_bits.m4">http://autoconf-archive.cryp.to/ac_define_integer_bits.m4</a>
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<h2>
LICENSE
</h2>
<div class="indent">
<p style="white-space:nowrap;">
Copyright © 2008 Scott Pakin <pakin@uiuc.edu>
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Copying and distribution of this file, with or without modification, are
permitted in any medium without royalty provided the copyright notice and
this notice are preserved.
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