File: acinclude.m4

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dnl AC_CHECK_SIZEOF_SYSTYPE is as the standard AC_CHECK_SIZEOF macro
dnl but also capable of checking the size of system defined types, not
dnl only compiler defined types.
dnl
dnl AC_CHECK_SYSTYPE is the same thing but replacing AC_CHECK_TYPE
dnl However AC_CHECK_TYPE is not by far as limited as AC_CHECK_SIZEOF
dnl (it at least makes use of <sys/types.h>, <stddef.h> and <stdlib.h>)

dnl AC_CHECK_SIZEOF_SYSTYPE(TYPE [, CROSS-SIZE])
AC_DEFUN([AC_CHECK_SIZEOF_SYSTYPE],
[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,
[AC_TRY_RUN([
#include <stdio.h>
#if STDC_HEADERS
#include <stdlib.h>
#include <stddef.h>
#endif
#if HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_BITYPES_H
#include <sys/bitypes.h>
#endif
int main()
{
  FILE *f=fopen("conftestval", "w");
  if (!f) return(1);
  fprintf(f, "%d\n", (int)sizeof($1));
  return(0);
}
], AC_CV_NAME=`cat conftestval`, AC_CV_NAME=0, ifelse([$2], , , AC_CV_NAME=$2))])dnl
AC_MSG_RESULT($AC_CV_NAME)
AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [Size of ] AC_TYPE_NAME)
undefine([AC_TYPE_NAME])dnl
undefine([AC_CV_NAME])dnl
])

dnl AC_CHECK_SYSTYPE(TYPE, DEFAULT)
AC_DEFUN([AC_CHECK_SYSTYPE],
[AC_REQUIRE([AC_HEADER_STDC])dnl
AC_MSG_CHECKING(for $1)
AC_CACHE_VAL(ac_cv_type_$1,
[AC_EGREP_CPP(dnl
changequote(<<,>>)dnl
<<(^|[^a-zA-Z_0-9])$1[^a-zA-Z_0-9]>>dnl
changequote([,]), [
/* What a mess.. many systems have added the (now standard) bit types
 * in their own ways, so we need to scan a wide variety of headers to
 * find them..
 */
#include <sys/types.h>
#if STDC_HEADERS
#include <stdlib.h>
#include <stddef.h>
#endif
#if HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_BITYPES_H
#include <sys/bitypes.h>
#endif
], ac_cv_type_$1=yes, ac_cv_type_$1=no)])dnl
AC_MSG_RESULT($ac_cv_type_$1)
if test $ac_cv_type_$1 = no; then
  AC_DEFINE($1, $2, [Have ] $2 [ datatype])
fi
])