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dnl @synopsis AX_CREATE_STDINT_H [( HEADER-TO-GENERATE [, HEDERS-TO-CHECK])]
dnl
dnl the "ISO C9X: 7.18 Integer types <stdint.h>" section requires the
dnl existence of an include file <stdint.h> that defines a set of
dnl typedefs, especially uint8_t,int32_t,uintptr_t.
dnl Many older installations will not provide this file, but some will
dnl have the very same definitions in <inttypes.h>. In other enviroments
dnl we can use the inet-types in <sys/types.h> which would define the
dnl typedefs int8_t and u_int8_t respectivly.
dnl
dnl This macros will create a local "_stdint.h" or the headerfile given as
dnl an argument. In many cases that file will just "#include <stdint.h>"
dnl or "#include <inttypes.h>", while in other environments it will provide
dnl the set of basic 'stdint's definitions/typedefs:
dnl int8_t,uint8_t,int16_t,uint16_t,int32_t,uint32_t,intptr_t,uintptr_t
dnl int_least32_t.. int_fast32_t.. intmax_t
dnl which may or may not rely on the definitions of other files,
dnl or using the AC_COMPILE_CHECK_SIZEOF macro to determine the actual
dnl sizeof each type.
dnl
dnl if your header files require the stdint-types you will want to create an
dnl installable file mylib-int.h that all your other installable header
dnl may include. So if you have a library package named "mylib", just use
dnl AX_CREATE_STDINT_H(mylib-int.h)
dnl in configure.ac and go to install that very header file in Makefile.am
dnl along with the other headers (mylib.h) - and the mylib-specific headers
dnl can simply use "#include <mylib-int.h>" to obtain the stdint-types.
dnl
dnl Remember, if the system already had a valid <stdint.h>, the generated
dnl file will include it directly. No need for fuzzy HAVE_STDINT_H things...
dnl
dnl @, (status: used on new platforms) (see http://ac-archive.sf.net/gstdint/)
dnl @version $Id: ax_create_stdint_h.m4,v 1.2 2003/02/10 01:06:52 guidod Exp $
dnl @author Guido Draheim <guidod@gmx.de>
AC_DEFUN([AX_CREATE_STDINT_H],
[# ------ AX CREATE STDINT H -------------------------------------
AC_MSG_CHECKING([for stdint types])
ac_stdint_h=`echo ifelse($1, , _stdint.h, $1)`
# try to shortcircuit - if the default include path of the compiler
# can find a "stdint.h" header then we assume that all compilers can.
AC_CACHE_VAL([ac_cv_header_stdint_t],[
old_CXXFLAGS="$CXXFLAGS" ; CXXFLAGS=""
old_CPPFLAGS="$CPPFLAGS" ; CPPFLAGS=""
old_CFLAGS="$CFLAGS" ; CFLAGS=""
AC_TRY_COMPILE([#include <stdint.h>],[int_least32_t v = 0;],
[ac_cv_stdint_result="(assuming C99 compatible system)"
ac_cv_header_stdint_t="stdint.h"; ],
[ac_cv_header_stdint_t=""])
CXXFLAGS="$old_CXXFLAGS"
CPPFLAGS="$old_CPPFLAGS"
CFLAGS="$old_CFLAGS" ])
v="... $ac_cv_header_stdint_h"
if test "$ac_stdint_h" = "stdint.h" ; then
AC_MSG_RESULT([(are you sure you want them in ./stdint.h?)])
elif test "$ac_stdint_h" = "inttypes.h" ; then
AC_MSG_RESULT([(are you sure you want them in ./inttypes.h?)])
elif test "_$ac_cv_header_stdint_t" = "_" ; then
AC_MSG_RESULT([(putting them into $ac_stdint_h)$v])
else
ac_cv_header_stdint="$ac_cv_header_stdint_t"
AC_MSG_RESULT([$ac_cv_header_stdint (shortcircuit)])
fi
if test "_$ac_cv_header_stdint_t" = "_" ; then # can not shortcircuit..
dnl .....intro message done, now do a few system checks.....
dnl btw, all CHECK_TYPE macros do automatically "DEFINE" a type, therefore
dnl we use the autoconf implementation detail _AC CHECK_TYPE_NEW instead
inttype_headers=`echo $2 | sed -e 's/,/ /g'`
ac_cv_stdint_result="(no helpful system typedefs seen)"
AC_CACHE_CHECK([for stdint uintptr_t], [ac_cv_header_stdint_x],[
ac_cv_header_stdint_x="" # the 1997 typedefs (inttypes.h)
AC_MSG_RESULT([(..)])
for i in stdint.h inttypes.h sys/inttypes.h $inttype_headers ; do
unset ac_cv_type_uintptr_t
unset ac_cv_type_uint64_t
_AC_CHECK_TYPE_NEW(uintptr_t,[ac_cv_header_stdint_x=$i],dnl
continue,[#include <$i>])
AC_CHECK_TYPE(uint64_t,[and64="/uint64_t"],[and64=""],[#include<$i>])
ac_cv_stdint_result="(seen uintptr_t$and64 in $i)"
break;
done
AC_MSG_CHECKING([for stdint uintptr_t])
])
if test "_$ac_cv_header_stdint_x" = "_" ; then
AC_CACHE_CHECK([for stdint uint32_t], [ac_cv_header_stdint_o],[
ac_cv_header_stdint_o="" # the 1995 typedefs (sys/inttypes.h)
AC_MSG_RESULT([(..)])
for i in inttypes.h sys/inttypes.h stdint.h $inttype_headers ; do
unset ac_cv_type_uint32_t
unset ac_cv_type_uint64_t
AC_CHECK_TYPE(uint32_t,[ac_cv_header_stdint_o=$i],dnl
continue,[#include <$i>])
AC_CHECK_TYPE(uint64_t,[and64="/uint64_t"],[and64=""],[#include<$i>])
ac_cv_stdint_result="(seen uint32_t$and64 in $i)"
break;
done
AC_MSG_CHECKING([for stdint uint32_t])
])
fi
if test "_$ac_cv_header_stdint_x" = "_" ; then
if test "_$ac_cv_header_stdint_o" = "_" ; then
AC_CACHE_CHECK([for stdint u_int32_t], [ac_cv_header_stdint_u],[
ac_cv_header_stdint_u="" # the BSD typedefs (sys/types.h)
AC_MSG_RESULT([(..)])
for i in sys/types.h inttypes.h sys/inttypes.h $inttype_headers ; do
unset ac_cv_type_u_int32_t
unset ac_cv_type_u_int64_t
AC_CHECK_TYPE(u_int32_t,[ac_cv_header_stdint_u=$i],dnl
continue,[#include <$i>])
AC_CHECK_TYPE(u_int64_t,[and64="/u_int64_t"],[and64=""],[#include<$i>])
ac_cv_stdint_result="(seen u_int32_t$and64 in $i)"
break;
done
AC_MSG_CHECKING([for stdint u_int32_t])
])
fi fi
dnl if there was no good C99 header file, do some typedef checks...
if test "_$ac_cv_header_stdint_x" = "_" ; then
AC_MSG_CHECKING([for stdint datatype model])
AC_MSG_RESULT([(..)])
AC_COMPILE_CHECK_SIZEOF(char)
AC_COMPILE_CHECK_SIZEOF(short)
AC_COMPILE_CHECK_SIZEOF(int)
AC_COMPILE_CHECK_SIZEOF(long)
AC_COMPILE_CHECK_SIZEOF(void*)
ac_cv_stdint_char_model=""
ac_cv_stdint_char_model="$ac_cv_stdint_char_model$ac_cv_sizeof_char"
ac_cv_stdint_char_model="$ac_cv_stdint_char_model$ac_cv_sizeof_short"
ac_cv_stdint_char_model="$ac_cv_stdint_char_model$ac_cv_sizeof_int"
ac_cv_stdint_long_model=""
ac_cv_stdint_long_model="$ac_cv_stdint_long_model$ac_cv_sizeof_int"
ac_cv_stdint_long_model="$ac_cv_stdint_long_model$ac_cv_sizeof_long"
ac_cv_stdint_long_model="$ac_cv_stdint_long_model$ac_cv_sizeof_voidp"
name="$ac_cv_stdint_long_model"
case "$ac_cv_stdint_char_model/$ac_cv_stdint_long_model" in
122/242) name="$name, IP16 (standard 16bit machine)" ;;
122/244) name="$name, LP32 (standard 32bit mac/win)" ;;
122/*) name="$name (unusual int16 model)" ;;
124/444) name="$name, ILP32 (standard 32bit unixish)" ;;
124/488) name="$name, LP64 (standard 64bit unixish)" ;;
124/448) name="$name, LLP64 (unusual 64bit unixish)" ;;
124/*) name="$name (unusual int32 model)" ;;
128/888) name="$name, ILP64 (unusual 64bit numeric)" ;;
128/*) name="$name (unusual int64 model)" ;;
222/*|444/*) name="$name (unusual dsptype)" ;;
*) name="$name (very unusal model)" ;;
esac
AC_MSG_RESULT([combined for stdint datatype model... $name])
fi
if test "_$ac_cv_header_stdint_x" != "_" ; then
ac_cv_header_stdint="$ac_cv_header_stdint_x"
elif test "_$ac_cv_header_stdint_o" != "_" ; then
ac_cv_header_stdint="$ac_cv_header_stdint_o"
elif test "_$ac_cv_header_stdint_u" != "_" ; then
ac_cv_header_stdint="$ac_cv_header_stdint_u"
else
ac_cv_header_stdint="stddef.h"
fi
AC_MSG_CHECKING([for extra inttypes in chosen header])
AC_MSG_RESULT([($ac_cv_header_stdint)])
dnl see if int_least and int_fast types are present in _this_ header.
unset ac_cv_type_int_least32_t
unset ac_cv_type_int_fast32_t
AC_CHECK_TYPE(int_least32_t,,,[#include <$ac_cv_header_stdint>])
AC_CHECK_TYPE(int_fast32_t,,,[#include<$ac_cv_header_stdint>])
AC_CHECK_TYPE(intmax_t,,,[#include <$ac_cv_header_stdint>])
fi # shortcircut to system "stdint.h"
# ------------------ PREPARE VARIABLES ------------------------------
if test "$GCC" = "yes" ; then
ac_cv_stdint_message="using gnu compiler "`$CC --version | head -1`
else
ac_cv_stdint_message="using $CC"
fi
AC_MSG_RESULT([make use of $ac_cv_header_stdint in $ac_stdint_h dnl
$ac_cv_stdint_result])
# ----------------- DONE inttypes.h checks START header -------------
AC_CONFIG_COMMANDS([$ac_stdint_h],[
AC_MSG_NOTICE(creating $ac_stdint_h : $_ac_stdint_h)
ac_stdint=$tmp/_stdint.h
echo "#ifndef" $_ac_stdint_h >$ac_stdint
echo "#define" $_ac_stdint_h "1" >>$ac_stdint
echo "#ifndef" _GENERATED_STDINT_H >>$ac_stdint
echo "#define" _GENERATED_STDINT_H '"'$PACKAGE $VERSION'"' >>$ac_stdint
echo "/* generated $ac_cv_stdint_message */" >>$ac_stdint
if test "_$ac_cv_header_stdint_t" != "_" ; then
echo "#define _STDINT_HAVE_STDINT_H" "1" >>$ac_stdint
fi
cat >>$ac_stdint <<STDINT_EOF
/* ................... shortcircuit part ........................... */
#if 0
#include <stdint.h>
#else
#include <stddef.h>
/* .................... configured part ............................ */
STDINT_EOF
echo "/* whether we have a C99 compatible stdint header file */" >>$ac_stdint
if test "_$ac_cv_header_stdint_x" != "_" ; then
ac_header="$ac_cv_header_stdint_x"
echo "#define _STDINT_HEADER_INTPTR" '"'"$ac_header"'"' >>$ac_stdint
else
echo "/* #undef _STDINT_HEADER_INTPTR */" >>$ac_stdint
fi
echo "/* whether we have a C96 compatible inttypes header file */" >>$ac_stdint
if test "_$ac_cv_header_stdint_o" != "_" ; then
ac_header="$ac_cv_header_stdint_o"
echo "#define _STDINT_HEADER_UINT32" '"'"$ac_header"'"' >>$ac_stdint
else
echo "/* #undef _STDINT_HEADER_UINT32 */" >>$ac_stdint
fi
echo "/* whether we have a BSD compatible inet types header */" >>$ac_stdint
if test "_$ac_cv_header_stdint_u" != "_" ; then
ac_header="$ac_cv_header_stdint_u"
echo "#define _STDINT_HEADER_U_INT32" '"'"$ac_header"'"' >>$ac_stdint
else
echo "/* #undef _STDINT_HEADER_U_INT32 */" >>$ac_stdint
fi
echo "" >>$ac_stdint
if test "_$ac_header" != "_" ; then if test "$ac_header" != "stddef.h" ; then
echo "#include <$ac_header>" >>$ac_stdint
echo "" >>$ac_stdint
fi fi
echo "/* which 64bit typedef has been found */" >>$ac_stdint
if test "$ac_cv_type_uint64_t" = "yes" ; then
echo "#define _STDINT_HAVE_UINT64_T" "1" >>$ac_stdint
else
echo "/* #undef _STDINT_HAVE_UINT64_T */" >>$ac_stdint
fi
if test "$ac_cv_type_u_int64_t" = "yes" ; then
echo "#define _STDINT_HAVE_U_INT64_T" "1" >>$ac_stdint
else
echo "/* #undef _STDINT_HAVE_U_INT64_T */" >>$ac_stdint
fi
echo "" >>$ac_stdint
echo "/* which type model has been detected */" >>$ac_stdint
if test "_$ac_cv_stdint_char_model" != "_" ; then
echo "#define _STDINT_CHAR_MODEL" "$ac_cv_stdint_char_model" >>$ac_stdint
echo "#define _STDINT_LONG_MODEL" "$ac_cv_stdint_long_model" >>$ac_stdint
else
echo "/* #undef _STDINT_CHAR_MODEL // skipped */" >>$ac_stdint
echo "/* #undef _STDINT_LONG_MODEL // skipped */" >>$ac_stdint
fi
echo "" >>$ac_stdint
echo "/* whether int_least types were detected */" >>$ac_stdint
if test "$ac_cv_type_int_least32_t" = "yes"; then
echo "#define _STDINT_HAVE_INT_LEAST32_T" "1" >>$ac_stdint
else
echo "/* #undef _STDINT_HAVE_INT_LEAST32_T */" >>$ac_stdint
fi
echo "/* whether int_fast types were detected */" >>$ac_stdint
if test "$ac_cv_type_int_fast32_t" = "yes"; then
echo "#define _STDINT_HAVE_INT_FAST32_T" "1" >>$ac_stdint
else
echo "/* #undef _STDINT_HAVE_INT_FAST32_T */" >>$ac_stdint
fi
echo "/* whether intmax_t type was detected */" >>$ac_stdint
if test "$ac_cv_type_intmax_t" = "yes"; then
echo "#define _STDINT_HAVE_INTMAX_T" "1" >>$ac_stdint
else
echo "/* #undef _STDINT_HAVE_INTMAX_T */" >>$ac_stdint
fi
echo "" >>$ac_stdint
cat >>$ac_stdint <<STDINT_EOF
/* .................... detections part ............................ */
/* whether we need to define bitspecific types from compiler base types */
#ifndef _STDINT_HEADER_INTPTR
#ifndef _STDINT_HEADER_UINT32
#ifndef _STDINT_HEADER_U_INT32
#define _STDINT_NEED_INT_MODEL_T
#else
#define _STDINT_HAVE_U_INT_TYPES
#endif
#endif
#endif
#ifdef _STDINT_HAVE_U_INT_TYPES
#undef _STDINT_NEED_INT_MODEL_T
#endif
#ifdef _STDINT_CHAR_MODEL
#if _STDINT_CHAR_MODEL+0 == 122 || _STDINT_CHAR_MODEL+0 == 124
#ifndef _STDINT_BYTE_MODEL
#define _STDINT_BYTE_MODEL 12
#endif
#endif
#endif
#ifndef _STDINT_HAVE_INT_LEAST32_T
#define _STDINT_NEED_INT_LEAST_T
#endif
#ifndef _STDINT_HAVE_INT_FAST32_T
#define _STDINT_NEED_INT_FAST_T
#endif
#ifndef _STDINT_HEADER_INTPTR
#define _STDINT_NEED_INTPTR_T
#ifndef _STDINT_HAVE_INTMAX_T
#define _STDINT_NEED_INTMAX_T
#endif
#endif
/* .................... definition part ............................ */
/* some system headers have good uint64_t */
#ifndef _HAVE_UINT64_T
#if defined _STDINT_HAVE_UINT64_T || defined HAVE_UINT64_T
#define _HAVE_UINT64_T
#elif defined _STDINT_HAVE_U_INT64_T || defined HAVE_U_INT64_T
#define _HAVE_UINT64_T
typedef u_int64_t uint64_t;
#endif
#endif
#ifndef _HAVE_UINT64_T
/* .. here are some common heuristics using compiler runtime specifics */
#if defined __STDC_VERSION__ && defined __STDC_VERSION__ >= 199901L
#define _HAVE_UINT64_T
typedef long long int64_t;
typedef unsigned long long uint64_t;
#elif !defined __STRICT_ANSI__
#if defined _MSC_VER || defined __WATCOMC__ || defined __BORLANDC__
#define _HAVE_UINT64_T
typedef __int64 int64_t;
typedef unsigned __int64 uint64_t;
#elif defined __GNUC__ || defined __MWERKS__ || defined __ELF__
/* note: all ELF-systems seem to have loff-support which needs 64-bit */
#if !defined _NO_LONGLONG
#define _HAVE_UINT64_T
typedef long long int64_t;
typedef unsigned long long uint64_t;
#endif
#elif defined __alpha || (defined __mips && defined _ABIN32)
#if !defined _NO_LONGLONG
typedef long int64_t;
typedef unsigned long uint64_t;
#endif
/* compiler/cpu type to define int64_t */
#endif
#endif
#endif
#if defined _STDINT_HAVE_U_INT_TYPES
/* int8_t int16_t int32_t defined by inet code, redeclare the u_intXX types */
typedef u_int8_t uint8_t;
typedef u_int16_t uint16_t;
typedef u_int32_t uint32_t;
/* glibc compatibility */
#ifndef __int8_t_defined
#define __int8_t_defined
#endif
#endif
#ifdef _STDINT_NEED_INT_MODEL_T
/* we must guess all the basic types. Apart from byte-adressable system, */
/* there a few 32-bit-only dsp-systems that we guard with BYTE_MODEL 8-} */
/* (btw, those nibble-addressable systems are way off, or so we assume) */
dnl /* have a look at "64bit and data size neutrality" at */
dnl /* http://unix.org/version2/whatsnew/login_64bit.html */
dnl /* (the shorthand "ILP" types always have a "P" part) */
#if defined _STDINT_BYTE_MODEL
#if _STDINT_LONG_MODEL+0 == 242
/* 2:4:2 = IP16 = a normal 16-bit system */
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned long uint32_t;
#ifndef __int8_t_defined
#define __int8_t_defined
typedef char int8_t;
typedef short int16_t;
typedef long int32_t;
#endif
#elif _STDINT_LONG_MODEL+0 == 244 || _STDINT_LONG_MODEL == 444
/* 2:4:4 = LP32 = a 32-bit system derived from a 16-bit */
/* 4:4:4 = ILP32 = a normal 32-bit system */
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
#ifndef __int8_t_defined
#define __int8_t_defined
typedef char int8_t;
typedef short int16_t;
typedef int int32_t;
#endif
#elif _STDINT_LONG_MODEL+0 == 484 || _STDINT_LONG_MODEL+0 == 488
/* 4:8:4 = IP32 = a 32-bit system prepared for 64-bit */
/* 4:8:8 = LP64 = a normal 64-bit system */
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
#ifndef __int8_t_defined
#define __int8_t_defined
typedef char int8_t;
typedef short int16_t;
typedef int int32_t;
#endif
/* this system has a "long" of 64bit */
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
typedef unsigned long uint64_t;
typedef long int64_t;
#endif
#elif _STDINT_LONG_MODEL+0 == 448
/* LLP64 a 64-bit system derived from a 32-bit system */
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
#ifndef __int8_t_defined
#define __int8_t_defined
typedef char int8_t;
typedef short int16_t;
typedef int int32_t;
#endif
/* assuming the system has a "long long" */
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
typedef unsigned long long uint64_t;
typedef long long int64_t;
#endif
#else
#define _STDINT_NO_INT32_T
#endif
#else
#define _STDINT_NO_INT8_T
#define _STDINT_NO_INT32_T
#endif
#endif
/*
* quote from SunOS-5.8 sys/inttypes.h:
* Use at your own risk. As of February 1996, the committee is squarely
* behind the fixed sized types; the "least" and "fast" types are still being
* discussed. The probability that the "fast" types may be removed before
* the standard is finalized is high enough that they are not currently
* implemented.
*/
#if defined _STDINT_NEED_INT_LEAST_T
typedef int8_t int_least8_t;
typedef int16_t int_least16_t;
typedef int32_t int_least32_t;
#ifdef _HAVE_UINT64_T
typedef int64_t int_least64_t;
#endif
typedef uint8_t uint_least8_t;
typedef uint16_t uint_least16_t;
typedef uint32_t uint_least32_t;
#ifdef _HAVE_UINT64_T
typedef uint64_t uint_least64_t;
#endif
/* least types */
#endif
#if defined _STDINT_NEED_INT_FAST_T
typedef int8_t int_fast8_t;
typedef int int_fast16_t;
typedef int32_t int_fast32_t;
#ifdef _HAVE_UINT64_T
typedef int64_t int_fast64_t;
#endif
typedef uint8_t uint_fast8_t;
typedef unsigned uint_fast16_t;
typedef uint32_t uint_fast32_t;
#ifdef _HAVE_UINT64_T
typedef uint64_t uint_fast64_t;
#endif
/* fast types */
#endif
#ifdef _STDINT_NEED_INTMAX_T
#ifdef _HAVE_UINT64_T
typedef int64_t intmax_t;
typedef uint64_t uintmax_t;
#else
typedef long intmax_t;
typedef unsigned long uintmax_t;
#endif
#endif
#ifdef _STDINT_NEED_INTPTR_T
#ifndef __intptr_t_defined
#define __intptr_t_defined
/* we encourage using "long" to store pointer values, never use "int" ! */
#if _STDINT_LONG_MODEL+0 == 242 || _STDINT_LONG_MODEL+0 == 484
typedef unsinged int uintptr_t;
typedef int intptr_t;
#elif _STDINT_LONG_MODEL+0 == 244 || _STDINT_LONG_MODEL+0 == 444
typedef unsigned long uintptr_t;
typedef long intptr_t;
#elif _STDINT_LONG_MODEL+0 == 448 && defined _HAVE_UINT64_T
typedef uint64_t uintptr_t;
typedef int64_t intptr_t;
#else /* matches typical system types ILP32 and LP64 - but not IP16 or LLP64 */
typedef unsigned long uintptr_t;
typedef long intptr_t;
#endif
#endif
#endif
/* shortcircuit*/
#endif
/* once */
#endif
#endif
STDINT_EOF
if cmp -s $ac_stdint_h $ac_stdint 2>/dev/null; then
AC_MSG_NOTICE([$ac_stdint_h is unchanged])
else
ac_dir=`AS_DIRNAME(["$ac_stdint_h"])`
AS_MKDIR_P(["$ac_dir"])
rm -f $ac_stdint_h
mv $ac_stdint $ac_stdint_h
fi
],[# variables for create stdint.h replacement
PACKAGE="$PACKAGE"
VERSION="$VERSION"
ac_stdint_h="$ac_stdint_h"
_ac_stdint_h=AS_TR_CPP(_$PACKAGE-$ac_stdint_h)
ac_cv_stdint_message="$ac_cv_stdint_message"
ac_cv_header_stdint_t="$ac_cv_header_stdint_t"
ac_cv_header_stdint_x="$ac_cv_header_stdint_x"
ac_cv_header_stdint_o="$ac_cv_header_stdint_o"
ac_cv_header_stdint_u="$ac_cv_header_stdint_u"
ac_cv_type_uint64_t="$ac_cv_type_uint64_t"
ac_cv_type_u_int64_t="$ac_cv_type_u_int64_t"
ac_cv_stdint_char_model="$ac_cv_stdint_char_model"
ac_cv_stdint_long_model="$ac_cv_stdint_long_model"
ac_cv_type_int_least32_t="$ac_cv_type_int_least32_t"
ac_cv_type_int_fast32_t="$ac_cv_type_int_fast32_t"
ac_cv_type_intmax_t="$ac_cv_type_intmax_t"
])
])
dnl @synopsis AC_COMPILE_CHECK_SIZEOF(TYPE [, HEADERS [, EXTRA_SIZES...]])
dnl
dnl This macro checks for the size of TYPE using compile checks, not
dnl run checks. You can supply extra HEADERS to look into. the check
dnl will cycle through 1 2 4 8 16 and any EXTRA_SIZES the user
dnl supplies. If a match is found, it will #define SIZEOF_`TYPE' to
dnl that value. Otherwise it will emit a configure time error
dnl indicating the size of the type could not be determined.
dnl
dnl The trick is that C will not allow duplicate case labels. While
dnl this is valid C code:
dnl
dnl switch (0) case 0: case 1:;
dnl
dnl The following is not:
dnl
dnl switch (0) case 0: case 0:;
dnl
dnl Thus, the AC_TRY_COMPILE will fail if the currently tried size
dnl does not match.
dnl
dnl Here is an example skeleton configure.in script, demonstrating the
dnl macro's usage:
dnl
dnl AC_PROG_CC
dnl AC_CHECK_HEADERS(stddef.h unistd.h)
dnl AC_TYPE_SIZE_T
dnl AC_CHECK_TYPE(ssize_t, int)
dnl
dnl headers='#ifdef HAVE_STDDEF_H
dnl #include <stddef.h>
dnl #endif
dnl #ifdef HAVE_UNISTD_H
dnl #include <unistd.h>
dnl #endif
dnl '
dnl
dnl AC_COMPILE_CHECK_SIZEOF(char)
dnl AC_COMPILE_CHECK_SIZEOF(short)
dnl AC_COMPILE_CHECK_SIZEOF(int)
dnl AC_COMPILE_CHECK_SIZEOF(long)
dnl AC_COMPILE_CHECK_SIZEOF(unsigned char *)
dnl AC_COMPILE_CHECK_SIZEOF(void *)
dnl AC_COMPILE_CHECK_SIZEOF(size_t, $headers)
dnl AC_COMPILE_CHECK_SIZEOF(ssize_t, $headers)
dnl AC_COMPILE_CHECK_SIZEOF(ptrdiff_t, $headers)
dnl AC_COMPILE_CHECK_SIZEOF(off_t, $headers)
dnl
dnl @author Kaveh Ghazi <ghazi@caip.rutgers.edu>
dnl @version $Id: ac_compile_check_sizeof.m4,v 1.1.1.1 2001/07/26 00:46:24 guidod Exp $
dnl
AC_DEFUN([AC_COMPILE_CHECK_SIZEOF],
[changequote(<<, >>)dnl
dnl The name to #define.
define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl
dnl The cache variable name.
define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl
changequote([, ])dnl
AC_MSG_CHECKING(size of $1)
AC_CACHE_VAL(AC_CV_NAME,
[for ac_size in 4 8 1 2 16 $2 ; do # List sizes in rough order of prevalence.
AC_TRY_COMPILE([#include "confdefs.h"
#include <sys/types.h>
$2
], [switch (0) case 0: case (sizeof ($1) == $ac_size):;], AC_CV_NAME=$ac_size)
if test x$AC_CV_NAME != x ; then break; fi
done
])
if test x$AC_CV_NAME = x ; then
AC_MSG_ERROR([cannot determine a size for $1])
fi
AC_MSG_RESULT($AC_CV_NAME)
AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1])
undefine([AC_TYPE_NAME])dnl
undefine([AC_CV_NAME])dnl
])
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