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Diff for /embedaddon/confuse/m4/size_max.m4 between versions 1.1.1.1 and 1.1.1.2

version 1.1.1.1, 2017/01/24 14:48:55 version 1.1.1.2, 2021/03/17 00:49:17
Line 1 Line 1
# size_max.m4 serial 5# size_max.m4 serial 10
dnl Copyright (C) 2003, 2005-2006 Free Software Foundation, Inc.dnl Copyright (C) 2003, 2005-2006, 2008-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation  dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,  dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.  dnl with or without modifications, as long as this notice is preserved.
Line 8  dnl From Bruno Haible. Line 8  dnl From Bruno Haible.
   
 AC_DEFUN([gl_SIZE_MAX],  AC_DEFUN([gl_SIZE_MAX],
 [  [
  AC_CHECK_HEADERS(stdint.h)  AC_CHECK_HEADERS([stdint.h])
   dnl First test whether the system already has SIZE_MAX.    dnl First test whether the system already has SIZE_MAX.
  AC_MSG_CHECKING([for SIZE_MAX])  AC_CACHE_CHECK([for SIZE_MAX], [gl_cv_size_max], [
  AC_CACHE_VAL([gl_cv_size_max], [ 
     gl_cv_size_max=      gl_cv_size_max=
     AC_EGREP_CPP([Found it], [      AC_EGREP_CPP([Found it], [
 #include <limits.h>  #include <limits.h>
Line 21  AC_DEFUN([gl_SIZE_MAX], Line 20  AC_DEFUN([gl_SIZE_MAX],
 #ifdef SIZE_MAX  #ifdef SIZE_MAX
 Found it  Found it
 #endif  #endif
], gl_cv_size_max=yes)], [gl_cv_size_max=yes])
     if test -z "$gl_cv_size_max"; then      if test -z "$gl_cv_size_max"; then
       dnl Define it ourselves. Here we assume that the type 'size_t' is not wider        dnl Define it ourselves. Here we assume that the type 'size_t' is not wider
       dnl than the type 'unsigned long'. Try hard to find a definition that can        dnl than the type 'unsigned long'. Try hard to find a definition that can
       dnl be used in a preprocessor #if, i.e. doesn't contain a cast.        dnl be used in a preprocessor #if, i.e. doesn't contain a cast.
      _AC_COMPUTE_INT([sizeof (size_t) * CHAR_BIT - 1], size_t_bits_minus_1,      AC_COMPUTE_INT([size_t_bits_minus_1], [sizeof (size_t) * CHAR_BIT - 1],
         [#include <stddef.h>          [#include <stddef.h>
#include <limits.h>], size_t_bits_minus_1=)#include <limits.h>], [size_t_bits_minus_1=])
      _AC_COMPUTE_INT([sizeof (size_t) <= sizeof (unsigned int)], fits_in_uint,      AC_COMPUTE_INT([fits_in_uint], [sizeof (size_t) <= sizeof (unsigned int)],
        [#include <stddef.h>], fits_in_uint=)        [#include <stddef.h>], [fits_in_uint=])
       if test -n "$size_t_bits_minus_1" && test -n "$fits_in_uint"; then        if test -n "$size_t_bits_minus_1" && test -n "$fits_in_uint"; then
         if test $fits_in_uint = 1; then          if test $fits_in_uint = 1; then
           dnl Even though SIZE_MAX fits in an unsigned int, it must be of type            dnl Even though SIZE_MAX fits in an unsigned int, it must be of type
           dnl 'unsigned long' if the type 'size_t' is the same as 'unsigned long'.            dnl 'unsigned long' if the type 'size_t' is the same as 'unsigned long'.
          AC_TRY_COMPILE([#include <stddef.h>          AC_COMPILE_IFELSE(
            extern size_t foo;            [AC_LANG_PROGRAM(
            extern unsigned long foo;               [[#include <stddef.h>
            ], [], fits_in_uint=0)                 extern size_t foo;
                  extern unsigned long foo;
                ]],
                [[]])],
             [fits_in_uint=0])
         fi          fi
         dnl We cannot use 'expr' to simplify this expression, because 'expr'          dnl We cannot use 'expr' to simplify this expression, because 'expr'
         dnl works only with 'long' integers in the host environment, while we          dnl works only with 'long' integers in the host environment, while we
Line 54  Found it Line 57  Found it
       fi        fi
     fi      fi
   ])    ])
   AC_MSG_RESULT([$gl_cv_size_max])  
   if test "$gl_cv_size_max" != yes; then    if test "$gl_cv_size_max" != yes; then
     AC_DEFINE_UNQUOTED([SIZE_MAX], [$gl_cv_size_max],      AC_DEFINE_UNQUOTED([SIZE_MAX], [$gl_cv_size_max],
       [Define as the maximum value of type 'size_t', if the system doesn't define it.])        [Define as the maximum value of type 'size_t', if the system doesn't define it.])
   fi    fi
     dnl Don't redefine SIZE_MAX in config.h if config.h is re-included after
     dnl <stdint.h>. Remember that the #undef in AH_VERBATIM gets replaced with
     dnl #define by AC_DEFINE_UNQUOTED.
     AH_VERBATIM([SIZE_MAX],
   [/* Define as the maximum value of type 'size_t', if the system doesn't define
      it. */
   #ifndef SIZE_MAX
   # undef SIZE_MAX
   #endif])
   ])
   
   dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
   dnl Remove this when we can assume autoconf >= 2.61.
   m4_ifdef([AC_COMPUTE_INT], [], [
     AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
 ])  ])
Removed from v.1.1.1.1  
changed lines
  Added in v.1.1.1.2

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