diff options
Diffstat (limited to 'm4/size_max.m4')
| -rw-r--r-- | m4/size_max.m4 | 47 |
1 files changed, 32 insertions, 15 deletions
diff --git a/m4/size_max.m4 b/m4/size_max.m4 index bfba811..4b247ab 100644 --- a/m4/size_max.m4 +++ b/m4/size_max.m4 @@ -1,5 +1,5 @@ -# size_max.m4 serial 5 -dnl Copyright (C) 2003, 2005-2006 Free Software Foundation, Inc. +# size_max.m4 serial 10 +dnl Copyright (C) 2003, 2005-2006, 2008-2013 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. @@ -8,10 +8,9 @@ dnl From Bruno Haible. 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. - AC_MSG_CHECKING([for SIZE_MAX]) - AC_CACHE_VAL([gl_cv_size_max], [ + AC_CACHE_CHECK([for SIZE_MAX], [gl_cv_size_max], [ gl_cv_size_max= AC_EGREP_CPP([Found it], [ #include <limits.h> @@ -21,24 +20,28 @@ AC_DEFUN([gl_SIZE_MAX], #ifdef SIZE_MAX Found it #endif -], gl_cv_size_max=yes) +], [gl_cv_size_max=yes]) if test -z "$gl_cv_size_max"; then dnl Define it ourselves. Here we assume that the type 'size_t' is not wider dnl than the type 'unsigned long'. Try hard to find a definition that can dnl be used in a preprocessor #if, i.e. doesn't contain a cast. - _AC_COMPUTE_INT([sizeof (size_t) * CHAR_BIT - 1], size_t_bits_minus_1, + AC_COMPUTE_INT([size_t_bits_minus_1], [sizeof (size_t) * CHAR_BIT - 1], [#include <stddef.h> -#include <limits.h>], size_t_bits_minus_1=) - _AC_COMPUTE_INT([sizeof (size_t) <= sizeof (unsigned int)], fits_in_uint, - [#include <stddef.h>], fits_in_uint=) +#include <limits.h>], [size_t_bits_minus_1=]) + AC_COMPUTE_INT([fits_in_uint], [sizeof (size_t) <= sizeof (unsigned int)], + [#include <stddef.h>], [fits_in_uint=]) if test -n "$size_t_bits_minus_1" && test -n "$fits_in_uint"; then if test $fits_in_uint = 1; then dnl Even though SIZE_MAX fits in an unsigned int, it must be of type dnl 'unsigned long' if the type 'size_t' is the same as 'unsigned long'. - AC_TRY_COMPILE([#include <stddef.h> - extern size_t foo; - extern unsigned long foo; - ], [], fits_in_uint=0) + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stddef.h> + extern size_t foo; + extern unsigned long foo; + ]], + [[]])], + [fits_in_uint=0]) fi dnl We cannot use 'expr' to simplify this expression, because 'expr' dnl works only with 'long' integers in the host environment, while we @@ -54,9 +57,23 @@ Found it fi fi ]) - AC_MSG_RESULT([$gl_cv_size_max]) if test "$gl_cv_size_max" != yes; then AC_DEFINE_UNQUOTED([SIZE_MAX], [$gl_cv_size_max], [Define as the maximum value of type 'size_t', if the system doesn't define it.]) 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])]) ]) |