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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Autoconf Macro: ac_need_stdint_h
</title>
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<h1>
ac_need_stdint_h
</h1>
<h2>
Obsolete Macro
</h2>
<p class="indent">
Superseded by <a href="ac_create_stdint_h.html">AC_CREATE_STDINT_H</a>.
</p>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_NEED_STDINT_H [( HEADER-TO-GENERATE [, HEDERS-TO-CHECK])]</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
The "ISO C9X: 7.18 Integer types <stdint.h>" section requires the
existence of an include file <stdint.h> that defines a set of
typedefs, especially uint8_t,int32_t,uintptr_t. Many older installations
will not provide this file, but some will have the very same definitions in
<inttypes.h>. In other enviroments we can use the inet-types in
<sys/types.h> which would define the typedefs int8_t and u_int8_t
respectivly.
</p>
<p>
This macros will create a local "stdint.h" if it cannot find the global
<stdint.h> (or it will create the headerfile given as an argument).
In many cases that file will just have a singular "#include
<inttypes.h>" statement, while in other environments it will provide
the set of basic stdint's defined:
int8_t,uint8_t,int16_t,uint16_t,int32_t,uint32_t,intptr_t,uintptr_t
int_least32_t.. int_fast32_t.. intmax_t which may or may not rely on the
definitions of other files, or using the <a href=
"ac_compile_check_sizeof.html">AC_COMPILE_CHECK_SIZEOF</a> macro to
determine the actual sizeof each type.
</p>
<p>
If your header files require the stdint-types you will want to create an
installable file package-stdint.h that all your other installable header
may include. So if you have a library package named "mylib", just use
</p>
<pre>
AC_NEED_STDINT(zziplib-stdint.h)
</pre>
<p>
in configure.in and go to install that very header file in Makefile.am
along with the other headers (mylib.h) - and the mylib-specific headers can
simply use "#include <mylib-stdint.h>" to obtain the stdint-types.
</p>
<p>
Remember, if the system already had a valid <stdint.h>, the generated
file will include it directly. No need for fuzzy HAVE_STDINT_H things...
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Guido U. Draheim <guidod@gmx.de>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2006-10-13
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_NEED_STDINT_H],
[AC_MSG_CHECKING([for stdint-types])
ac_cv_header_stdint="no-file"
ac_cv_header_stdint_u="no-file"
for i in $1 inttypes.h sys/inttypes.h sys/int_types.h stdint.h ; do
AC_CHECK_TYPEDEF_(uint32_t, $i, [ac_cv_header_stdint=$i])
done
for i in $1 sys/types.h inttypes.h sys/inttypes.h sys/int_types.h ; do
AC_CHECK_TYPEDEF_(u_int32_t, $i, [ac_cv_header_stdint_u=$i])
done
dnl debugging: __AC_MSG( !$ac_cv_header_stdint!$ac_cv_header_stdint_u! ...)
ac_stdint_h=`echo ifelse($1, , stdint.h, $1)`
if test "$ac_cv_header_stdint" != "no-file" ; then
if test "$ac_cv_header_stdint" != "$ac_stdint_h" ; then
AC_MSG_RESULT(found in $ac_cv_header_stdint)
echo "#include <$ac_cv_header_stdint>" >$ac_stdint_h
AC_MSG_RESULT(creating $ac_stdint_h - (just to include $ac_cv_header_stdint) )
else
AC_MSG_RESULT(found in $ac_stdint_h)
fi
ac_cv_header_stdint_generated=false
elif test "$ac_cv_header_stdint_u" != "no-file" ; then
AC_MSG_RESULT(found u_types in $ac_cv_header_stdint_u)
if test $ac_cv_header_stdint = "$ac_stdint_h" ; then
AC_MSG_RESULT(creating $ac_stdint_h - includes $ac_cv_header_stdint, expect problems!)
else
AC_MSG_RESULT(creating $ac_stdint_h - (include inet-types in $ac_cv_header_stdint_u and re-typedef))
fi
echo "#ifndef __AC_STDINT_H" >$ac_stdint_h
echo "#define __AC_STDINT_H" '"'$ac_stdint_h'"' >>$ac_stdint_h
echo "#ifndef _GENERATED_STDINT_H" >>$ac_stdint_h
echo "#define _GENERATED_STDINT_H" '"'$PACKAGE $VERSION'"' >>$ac_stdint_h
cat >>$ac_stdint_h <<EOF
#include <stddef.h>
#include <$ac_cv_header_stdint_u>
/* int8_t int16_t int32_t defined by inet code */
typedef u_int8_t uint8_t;
typedef u_int16_t uint16_t;
typedef u_int32_t uint32_t;
/* it's a networkable system, but without any stdint.h */
/* hence it's an older 32-bit system... (a wild guess that seems to work) */
typedef u_int32_t uintptr_t;
typedef int32_t intptr_t;
EOF
ac_cv_header_stdint_generated=true
else
AC_MSG_RESULT(not found, need to guess the types now... )
AC_COMPILE_CHECK_SIZEOF(long, 32)
AC_COMPILE_CHECK_SIZEOF(void*, 32)
AC_MSG_RESULT( creating $ac_stdint_h - using detected values for sizeof long and sizeof void* )
echo "#ifndef __AC_STDINT_H" >$ac_stdint_h
echo "#define __AC_STDINT_H" '"'$ac_stdint_h'"' >>$ac_stdint_h
echo "#ifndef _GENERATED_STDINT_H" >>$ac_stdint_h
echo "#define _GENERATED_STDINT_H" '"'$PACKAGE $VERSION'"' >>$ac_stdint_h
cat >>$ac_stdint_h <<EOF
/* ISO C 9X: 7.18 Integer types <stdint.h> */
#define __int8_t_defined
typedef signed char int8_t;
typedef unsigned char uint8_t;
typedef signed short int16_t;
typedef unsigned short uint16_t;
EOF
if test "$ac_cv_sizeof_long" = "64" ; then
cat >>$ac_stdint_h <<EOF
typedef signed int int32_t;
typedef unsigned int uint32_t;
typedef signed long int64_t;
typedef unsigned long uint64_t;
#define int64_t int64_t
#define uint64_t uint64_t
EOF
else
cat >>$ac_stdint_h <<EOF
typedef signed long int32_t;
typedef unsigned long uint32_t;
EOF
fi
if test "$ac_cv_sizeof_long" != "$ac_cv_sizeof_voidp" ; then
cat >>$ac_stdint_h <<EOF
typedef signed int intptr_t;
typedef unsigned int uintptr_t;
EOF
else
cat >>$ac_stdint_h <<EOF
typedef signed long intptr_t;
typedef unsigned long uintptr_t;
EOF
ac_cv_header_stdint_generated=true
fi
fi
if "$ac_cv_header_stdint_generated" ; then
cat >>$ac_stdint_h <<EOF
typedef int8_t int_least8_t;
typedef int16_t int_least16_t;
typedef int32_t int_least32_t;
typedef uint8_t uint_least8_t;
typedef uint16_t uint_least16_t;
typedef uint32_t uint_least32_t;
typedef int8_t int_fast8_t;
typedef int32_t int_fast16_t;
typedef int32_t int_fast32_t;
typedef uint8_t uint_fast8_t;
typedef uint32_t uint_fast16_t;
typedef uint32_t uint_fast32_t;
typedef long int intmax_t;
typedef unsigned long uintmax_t;
/* once */
#endif
#endif
EOF
fi dnl
])
</pre>
</div>
<h2>
License
</h2>
<div class="indent">
<span style="white-space:nowrap;">Copyright © 2006 Guido U. Draheim
<guidod@gmx.de></span>
<p>
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
</p>
<p>
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
</p>
<p>
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc., 59
Temple Place - Suite 330, Boston, MA 02111-1307, USA.
</p>
<p>
As a special exception, the respective Autoconf Macro's copyright owner
gives unlimited permission to copy, distribute and modify the configure
scripts that are the output of Autoconf when processing the Macro. You need
not follow the terms of the GNU General Public License when using or
distributing such scripts, even though portions of the text of the Macro
appear in them. The GNU General Public License (GPL) does govern all other
use of the material that constitutes the Autoconf Macro.
</p>
<p>
This special exception to the GPL applies to versions of the Autoconf Macro
released by the Autoconf Macro Archive. When you make and distribute a
modified version of the Autoconf Macro, you may extend this special
exception to the GPL to apply to your modified version as well.
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