ref: e0e9c9962ab93d08f9f7f5ddee482e77fb44e8fe
dir: /aclocal.m4/
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: aclocal.m4,v 1.4 2001/12/08 20:17:56 cbagwell 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 $3 ; do # List sizes in rough order of prevalence.
AC_TRY_COMPILE([#include "confdefs.h"
#include <sys/types.h>
], [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
])
dnl AC_CREATE_STDINT_H [( HEADER-TO-GENERATE [, HEDERS-TO-CHECK])] -*- sh -*-
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 have a singular
dnl "#include <stdint.h>" or "#include <inttypes.h>" statement, while
dnl in other environments it will provide the set of basic 'stdint's defined:
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 AC_CREATE_STDINT_H(mylib-int.h)
dnl in configure.in 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 (this file is part of the http://ac-archive.sf.net/gstdint project)
dnl @version $Id: aclocal.m4,v 1.4 2001/12/08 20:17:56 cbagwell Exp $
dnl @author Guido Draheim <guidod@gmx.de> STATUS: used on new platforms
AC_DEFUN([AC_CREATE_STDINT_H],
[# ------ AC CREATE STDINT H -------------------------------------
AC_MSG_CHECKING([for stdint-types....])
ac_stdint_h=`echo ifelse($1, , _stdint.h, $1)`
if test "$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?)")
else
AC_MSG_RESULT("(putting them into $ac_stdint_h)")
fi
inttype_headers=`echo inttypes.h sys/inttypes.h sys/inttypes.h $2 \
| sed -e 's/,/ /g'`
ac_cv_header_stdint_x="no-file"
ac_cv_header_stdint_o="no-file"
ac_cv_header_stdint_u="no-file"
for i in stdint.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 <$i>])
AC_CHECK_TYPE(uint64_t,[and64="(uint64_t too)"],[and64=""],[#include<$i>])
AC_MSG_RESULT(... seen our uintptr_t in $i $and64)
break;
done
if test "$ac_cv_header_stdint_x" = "no-file" ; then
for i in 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 <$i>])
AC_CHECK_TYPE(uint64_t,[and64="(uint64_t too)"],[and64=""],[#include<$i>])
AC_MSG_RESULT(... seen our uint32_t in $i $and64)
break;
done
if test "$ac_cv_header_stdint_o" = "no-file" ; then
for i in sys/types.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 <$i>])
AC_CHECK_TYPE(uint64_t,[and64="(u_int64_t too)"],[and64=""],[#include<$i>])
AC_MSG_RESULT(... seen our u_int32_t in $i $and64)
break;
done
fi
fi
# ----------------- DONE inttypes.h checks MAYBE C basic types --------
if test "$ac_cv_header_stdint_x" = "no-file" ; then
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_header_stdint_test="yes"
else
ac_cv_header_stdint_test="no"
fi
# ----------------- DONE inttypes.h checks START header -------------
_ac_stdint_h=AS_TR_CPP(_$ac_stdint_h)
AC_MSG_RESULT(creating $ac_stdint_h : $_ac_stdint_h)
echo "#ifndef" $_ac_stdint_h >$ac_stdint_h
echo "#define" $_ac_stdint_h "1" >>$ac_stdint_h
echo "#ifndef" _GENERATED_STDINT_H >>$ac_stdint_h
echo "#define" _GENERATED_STDINT_H '"'$PACKAGE $VERSION'"' >>$ac_stdint_h
if test "$GCC" = "yes" ; then
echo "/* generated using a gnu compiler version" `$CC --version` "*/" \
>>$ac_stdint_h
else
echo "/* generated using $CC */" >>$ac_stdint_h
fi
echo "" >>$ac_stdint_h
if test "$ac_cv_header_stdint_x" != "no-file" ; then
ac_cv_header_stdint="$ac_cv_header_stdint_x"
elif test "$ac_cv_header_stdint_o" != "no-file" ; then
ac_cv_header_stdint="$ac_cv_header_stdint_o"
elif test "$ac_cv_header_stdint_u" != "no-file" ; then
ac_cv_header_stdint="$ac_cv_header_stdint_u"
else
ac_cv_header_stdint="stddef.h"
fi
if test "$ac_cv_header_stdint" != "stddef.h" ; then
if test "$ac_cv_header_stdint" != "stdint.h" ; then
AC_MSG_RESULT(..adding include stddef.h)
echo "#include <stddef.h>" >>$ac_stdint_h
fi ; fi
AC_MSG_RESULT(..adding include $ac_cv_header_stdint)
echo "#include <$ac_cv_header_stdint>" >>$ac_stdint_h
echo "" >>$ac_stdint_h
# ----------------- DONE header START basic int types -------------
if test "$ac_cv_header_stdint_x" = "no-file" ; then
AC_MSG_RESULT(... need to look at C basic types)
dnl ac_cv_header_stdint_test="yes" # moved up before creating the file
else
AC_MSG_RESULT(... seen good stdint.h inttypes)
dnl ac_cv_header_stdint_test="no" # moved up before creating the file
fi
if test "$ac_cv_header_stdint_u" != "no-file" ; then
AC_MSG_RESULT(... seen bsd/sysv typedefs)
cat >>$ac_stdint_h <<EOF
/* int8_t int16_t int32_t defined by inet code, redeclare the u_intXX types */
typedef u_int8_t uint8_t;
typedef u_int16_t uint16_t;
typedef u_int32_t uint32_t;
EOF
cat >>$ac_stdint_h <<EOF
/* glibc compatibility */
#ifndef __int8_t_defined
#define __int8_t_defined
#endif
EOF
fi
ac_cv_sizeof_x="$ac_cv_sizeof_char:$ac_cv_sizeof_short"
ac_cv_sizeof_X="$ac_cv_sizeof_x:$ac_cv_sizeof_int"
ac_cv_sizeof_X="$ac_cv_sizeof_X:$ac_cv_sizeof_voidp:$ac_cv_sizeof_long"
if test "$ac_cv_header_stdint" = "stddef.h" ; then
# we must guess all the basic types. Apart from byte-adressable system,
# there a few 32-bit-only dsp-systems. nibble-addressable systems are way off.
cat >>$ac_stdint_h <<EOF
/* ------------ BITSPECIFIC INTTYPES SECTION --------------- */
EOF
t="typedefs for a"
case "$ac_cv_sizeof_X" in
1:2:2:2:4) AC_MSG_RESULT(..adding $t normal 16-bit system)
cat >>$ac_stdint_h <<EOF
/* 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
EOF
;;
1:2:2:4:4) AC_MSG_RESULT(..adding $t 32-bit system derived from a 16-bit)
cat >>$ac_stdint_h <<EOF
/* a 32-bit system derived from a 16-bit */
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
EOF
;;
1:2:4:4:4) AC_MSG_RESULT(..adding $t normal 32-bit system)
cat >>$ac_stdint_h <<EOF
/* 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
EOF
;;
1:2:4:4:8) AC_MSG_RESULT(..adding $t 32-bit system prepared for 64-bit)
cat >>$ac_stdint_h <<EOF
/* a 32-bit system prepared for 64-bit */
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
EOF
;;
1:2:4:8:8) AC_MSG_RESULT(..adding $t normal 64-bit system)
cat >>$ac_stdint_h <<EOF
/* 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
EOF
;;
1:2:4:8:4) AC_MSG_RESULT(..adding $t 64-bit system derived from a 32-bit)
cat >>$ac_stdint_h <<EOF
/* 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
EOF
;;
*)
AC_MSG_ERROR([ $ac_cv_sizeof_X dnl
what is that a system? contact the author, quick! http://ac-archive.sf.net])
exit 1
;;
esac
fi
# ------------- DONE basic int types START int64_t types ------------
if test "$ac_cv_type_uint64_t" = "yes"
then AC_MSG_RESULT(... seen good uint64_t)
cat >>$ac_stdint_h <<EOF
/* system headers have good uint64_t */
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
#endif
EOF
elif test "$ac_cv_type_u_int64_t" = "yes"
then AC_MSG_RESULT(..adding typedef u_int64_t uint64_t)
cat >>$ac_stdint_h <<EOF
/* system headers have an u_int64_t */
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
typedef u_int64_t uint64_t;
#endif
EOF
else AC_MSG_RESULT(..adding generic uint64_t runtime checks)
cat >>$ac_stdint_h <<EOF
/* -------------------- 64 BIT GENERIC SECTION -------------------- */
/* here are some common heuristics using compiler runtime specifics */
#if defined __STDC_VERSION__ && defined __STDC_VERSION__ > 199901L
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
typedef long long int64_t;
typedef unsigned long long uint64_t;
#endif
#elif !defined __STRICT_ANSI__
#if defined _MSC_VER || defined __WATCOMC__ || defined __BORLANDC__
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
typedef __int64 int64_t;
typedef unsigned __int64 uint64_t;
#endif
#elif defined __GNUC__ || defined __MWERKS__ || defined __ELF__
dnl /* note: all ELF-systems seem to have loff-support which needs 64-bit */
#if !defined _NO_LONGLONG
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
typedef long long int64_t;
typedef unsigned long long uint64_t;
#endif
#endif
#elif defined __alpha || (defined __mips && defined _ABIN32)
#if !defined _NO_LONGLONG
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
typedef long int64_t;
typedef unsigned long uint64_t;
#endif
#endif
/* compiler/cpu type ... or just ISO C99 */
#endif
#endif
EOF
# plus a default 64-bit for systems that are likely to be 64-bit ready
case "$ac_cv_sizeof_x:$ac_cv_sizeof_voidp:$ac_cv_sizeof_long" in
1:2:8:8) AC_MSG_RESULT(..adding uint64_t default, normal 64-bit system)
cat >>$ac_stdint_h <<EOF
/* DEFAULT: */
/* seen normal 64-bit system, CC has sizeof(long and void*) == 8 bytes */
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
typedef long int64_t;
typedef unsigned long uint64_t;
#endif
EOF
;;
1:2:4:8) AC_MSG_RESULT(..adding uint64_t default, typedef to long)
cat >>$ac_stdint_h <<EOF
/* DEFAULT: */
/* seen 32-bit system prepared for 64-bit, CC has sizeof(long) == 8 bytes */
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
typedef long int64_t;
typedef unsigned long uint64_t;
#endif
EOF
;;
1:2:8:4) AC_MSG_RESULT(..adding uint64_t default, typedef long long)
cat >>$ac_stdint_h <<EOF
/* DEFAULT: */
/* seen 64-bit derived from a 32-bit, CC has sizeof(long) == 4 bytes */
#ifndef _HAVE_UINT64_T
#define _HAVE_UINT64_T
typedef long long int64_t;
typedef unsigned long long uint64_t;
#endif
EOF
;;
*)
cat >>$ac_stdint_h <<EOF
/* NOTE: */
/* the configure-checks for the basic types did not make us believe */
/* that we could add a fallback to a 'long long' typedef to int64_t */
EOF
esac
fi
# ------------- DONE int64_t types START intptr types ------------
if test "$ac_cv_header_stdint_x" = "no-file" ; then
cat >>$ac_stdint_h <<EOF
/* -------------------------- INPTR SECTION --------------------------- */
EOF
case "$ac_cv_sizeof_x:$ac_cv_sizeof_voidp" in
1:2:2)
a="int16_t" ; cat >>$ac_stdint_h <<EOF
/* we tested sizeof(void*) to be of 2 chars, hence we declare it 16-bit */
typedef uint16_t uintptr_t;
typedef int16_t intptr_t;
EOF
;;
1:2:4)
a="int32_t" ; cat >>$ac_stdint_h <<EOF
/* we tested sizeof(void*) to be of 4 chars, hence we declare it 32-bit */
typedef uint32_t uintptr_t;
typedef int32_t intptr_t;
EOF
;;
1:2:8)
a="int64_t" ; cat >>$ac_stdint_h <<EOF
/* we tested sizeof(void*) to be of 8 chars, hence we declare it 64-bit */
typedef uint64_t uintptr_t;
typedef int64_t intptr_t;
EOF
;;
*)
a="long" ; cat >>$ac_stdint_h <<EOF
/* we tested sizeof(void*) but got no guess, hence we declare it as if long */
typedef unsigned long uintptr_t;
typedef long intptr_t;
EOF
;;
esac
AC_MSG_RESULT(..adding typedef $a intptr_t)
fi
# ------------- DONE intptr types START int_least types ------------
if test "$ac_cv_header_stdint_x" = "no-file" ; then
AC_MSG_RESULT(..adding generic int_least-types)
cat >>$ac_stdint_h <<EOF
/* --------------GENERIC INT_LEAST / INTMAX SECTION ------------------ */
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;
#ifdef _HAVE_INT64_T
typedef int64_t intmax_t;
typedef uint64_t uintmax_t;
#else
typedef long int intmax_t;
typedef unsigned long uintmax_t;
#endif
EOF
fi
AC_MSG_RESULT(... DONE $ac_stdint_h)
cat >>$ac_stdint_h <<EOF
/* once */
#endif
#endif
EOF
])
dnl quote from SunOS-5.8 sys/inttypes.h:
dnl Use at your own risk. As of February 1996, the committee is squarely
dnl behind the fixed sized types; the "least" and "fast" types are still being
dnl discussed. The probability that the "fast" types may be removed before
dnl the standard is finalized is high enough that they are not currently
dnl implemented.