AC_NEED_STDINT_H [( HEADER-TO-GENERATE [, HEDERS-TO-CHECK])]
,
Guido U. Draheim <guidod@gmx.de>
GPLWithACException
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. As a special exception, the respective
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cryp.to ac-archive's Obsoleted (obsoleted)
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.
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
AC_COMPILE_CHECK_SIZEOF macro to determine the actual sizeof each
type.
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
AC_NEED_STDINT(zziplib-stdint.h)
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.
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...
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
])