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<title>Autoconf Macro: ac_need_stdint_h</title>
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<td style="width:50%;" align="center">[<a href="index.html">Macro Index
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<td style="width:50%;" align="center">[<a href=
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"../m4source/ac_need_stdint_h.m4">Download M4 Source</a>]</td>
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<h1>ac_need_stdint_h</h1>
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<p style="text-align:left; white-space:nowrap;"><code>AC_NEED_STDINT_H [(
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HEADER-TO-GENERATE [, HEDERS-TO-CHECK])]</code></p>
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<p>obsoleted - superseded by AC_CREATE_STDINT_H</p>
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<p>the "ISO C9X: 7.18 Integer types <stdint.h>" section requires the
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existence of an include file <stdint.h> that defines a set of
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typedefs, especially uint8_t,int32_t,uintptr_t. Many older installations
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will not provide this file, but some will have the very same definitions in
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<inttypes.h>. In other enviroments we can use the inet-types in
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<sys/types.h> which would define the typedefs int8_t and u_int8_t
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<p>This macros will create a local "stdint.h" if it cannot find the global
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<stdint.h> (or it will create the headerfile given as an argument).
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In many cases that file will just have a singular "#include
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<inttypes.h>" statement, while in other environments it will provide
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the set of basic stdint's defined:
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int8_t,uint8_t,int16_t,uint16_t,int32_t,uint32_t,intptr_t,uintptr_t
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int_least32_t.. int_fast32_t.. intmax_t which may or may not rely on the
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definitions of other files, or using the AC_COMPILE_CHECK_SIZEOF macro to
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determine the actual sizeof each type.</p>
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<p>if your header files require the stdint-types you will want to create an
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installable file package-stdint.h that all your other installable header
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may include. So if you have a library package named "mylib", just use</p>
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AC_NEED_STDINT(zziplib-stdint.h)
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<p>in configure.in and go to install that very header file in Makefile.am
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along with the other headers (mylib.h) - and the mylib-specific headers can
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simply use "#include <mylib-stdint.h>" to obtain the
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<p>Remember, if the system already had a valid <stdint.h>, the
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generated file will include it directly. No need for fuzzy HAVE_STDINT_H
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<p>1.5 (last modified: 2003-02-02)</p>
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<p>Guido Draheim <guidod@gmx.de></p>
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<h2>M4 Source Code</h2>
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<pre class="m4source">
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AC_DEFUN([AC_NEED_STDINT_H],
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[AC_MSG_CHECKING([for stdint-types])
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ac_cv_header_stdint="no-file"
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ac_cv_header_stdint_u="no-file"
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for i in $1 inttypes.h sys/inttypes.h sys/int_types.h stdint.h ; do
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AC_CHECK_TYPEDEF_(uint32_t, $i, [ac_cv_header_stdint=$i])
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for i in $1 sys/types.h inttypes.h sys/inttypes.h sys/int_types.h ; do
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AC_CHECK_TYPEDEF_(u_int32_t, $i, [ac_cv_header_stdint_u=$i])
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dnl debugging: __AC_MSG( !$ac_cv_header_stdint!$ac_cv_header_stdint_u! ...)
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ac_stdint_h=`echo ifelse($1, , stdint.h, $1)`
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if test "$ac_cv_header_stdint" != "no-file" ; then
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if test "$ac_cv_header_stdint" != "$ac_stdint_h" ; then
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AC_MSG_RESULT(found in $ac_cv_header_stdint)
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echo "#include <$ac_cv_header_stdint>" >$ac_stdint_h
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AC_MSG_RESULT(creating $ac_stdint_h - (just to include $ac_cv_header_stdint) )
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AC_MSG_RESULT(found in $ac_stdint_h)
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ac_cv_header_stdint_generated=false
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elif test "$ac_cv_header_stdint_u" != "no-file" ; then
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AC_MSG_RESULT(found u_types in $ac_cv_header_stdint_u)
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if test $ac_cv_header_stdint = "$ac_stdint_h" ; then
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AC_MSG_RESULT(creating $ac_stdint_h - includes $ac_cv_header_stdint, expect problems!)
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AC_MSG_RESULT(creating $ac_stdint_h - (include inet-types in $ac_cv_header_stdint_u and re-typedef))
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echo "#ifndef __AC_STDINT_H" >$ac_stdint_h
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echo "#define __AC_STDINT_H" '"'$ac_stdint_h'"' >>$ac_stdint_h
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echo "#ifndef _GENERATED_STDINT_H" >>$ac_stdint_h
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echo "#define _GENERATED_STDINT_H" '"'$PACKAGE $VERSION'"' >>$ac_stdint_h
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cat >>$ac_stdint_h <<EOF
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#include <stddef.h>
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#include <$ac_cv_header_stdint_u>
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/* int8_t int16_t int32_t defined by inet code */
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typedef u_int8_t uint8_t;
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typedef u_int16_t uint16_t;
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typedef u_int32_t uint32_t;
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/* it's a networkable system, but without any stdint.h */
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/* hence it's an older 32-bit system... (a wild guess that seems to work) */
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typedef u_int32_t uintptr_t;
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typedef int32_t intptr_t;
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ac_cv_header_stdint_generated=true
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AC_MSG_RESULT(not found, need to guess the types now... )
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AC_COMPILE_CHECK_SIZEOF(long, 32)
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AC_COMPILE_CHECK_SIZEOF(void*, 32)
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AC_MSG_RESULT( creating $ac_stdint_h - using detected values for sizeof long and sizeof void* )
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echo "#ifndef __AC_STDINT_H" >$ac_stdint_h
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echo "#define __AC_STDINT_H" '"'$ac_stdint_h'"' >>$ac_stdint_h
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echo "#ifndef _GENERATED_STDINT_H" >>$ac_stdint_h
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echo "#define _GENERATED_STDINT_H" '"'$PACKAGE $VERSION'"' >>$ac_stdint_h
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cat >>$ac_stdint_h <<EOF
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/* ISO C 9X: 7.18 Integer types <stdint.h> */
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#define __int8_t_defined
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typedef signed char int8_t;
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typedef unsigned char uint8_t;
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typedef signed short int16_t;
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typedef unsigned short uint16_t;
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if test "$ac_cv_sizeof_long" = "64" ; then
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cat >>$ac_stdint_h <<EOF
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typedef signed int int32_t;
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typedef unsigned int uint32_t;
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typedef signed long int64_t;
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typedef unsigned long uint64_t;
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#define int64_t int64_t
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#define uint64_t uint64_t
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cat >>$ac_stdint_h <<EOF
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typedef signed long int32_t;
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typedef unsigned long uint32_t;
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if test "$ac_cv_sizeof_long" != "$ac_cv_sizeof_voidp" ; then
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cat >>$ac_stdint_h <<EOF
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typedef signed int intptr_t;
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typedef unsigned int uintptr_t;
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cat >>$ac_stdint_h <<EOF
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typedef signed long intptr_t;
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typedef unsigned long uintptr_t;
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ac_cv_header_stdint_generated=true
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if "$ac_cv_header_stdint_generated" ; then
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cat >>$ac_stdint_h <<EOF
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typedef int8_t int_least8_t;
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typedef int16_t int_least16_t;
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typedef int32_t int_least32_t;
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typedef uint8_t uint_least8_t;
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typedef uint16_t uint_least16_t;
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typedef uint32_t uint_least32_t;
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typedef int8_t int_fast8_t;
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typedef int32_t int_fast16_t;
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typedef int32_t int_fast32_t;
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typedef uint8_t uint_fast8_t;
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typedef uint32_t uint_fast16_t;
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typedef uint32_t uint_fast32_t;
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typedef long int intmax_t;
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typedef unsigned long uintmax_t;
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<a href="COPYING.html">GNU General Public License</a> with this special
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<a href="COPYING-Exception.html">exception</a>.
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