uint32_t.m4   [plain text]

# uint32_t.m4 serial 4

# Copyright (C) 2004 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# Written by Paul Eggert.

AC_DEFUN([gl_AC_TYPE_UINT32_T],
[
  AC_CACHE_CHECK([for uint32_t], gl_cv_c_uint32_t,
    [gl_cv_c_uint32_t=no
     for ac_type in "uint32_t" "unsigned int" \
	 "unsigned long int" "unsigned short int"; do
       AC_COMPILE_IFELSE(
	 [AC_LANG_BOOL_COMPILE_TRY(
	    [AC_INCLUDES_DEFAULT],
	    [[($ac_type) -1 == 4294967295U]])],
	 [gl_cv_c_uint32_t=$ac_type])
       test "$gl_cv_c_uint32_t" != no && break
     done])
  case "$gl_cv_c_uint32_t" in
  no|uint32_t) ;;
  *)
    AC_DEFINE(_UINT32_T, 1,
      [Define for Solaris 2.5.1 so uint32_t typedef from <sys/synch.h>,
       <pthread.h>, or <semaphore.h> is not used. If the typedef was
       allowed, the #define below would cause a syntax error.])
    AC_DEFINE_UNQUOTED(uint32_t, $gl_cv_c_uint32_t,
      [Define to the type of a unsigned integer type of width exactly 32 bits
       if such a type exists and the standard includes do not define it.])
    ;;
  esac

  AC_CACHE_CHECK([for UINT32_MAX], gl_cv_c_uint32_max,
    [AC_COMPILE_IFELSE(
       [AC_LANG_BOOL_COMPILE_TRY(
	  [AC_INCLUDES_DEFAULT],
	  [[UINT32_MAX == 4294967295U]])],
       [gl_cv_c_uint32_max=yes],
       [gl_cv_c_uint32_max=no])])
  case $gl_cv_c_uint32_max,$gl_cv_c_uint32_t in
  yes,*) ;;
  *,no) ;;
  *)
    AC_DEFINE(UINT32_MAX, 4294967295U,
      [Define to its maximum value if an unsigned integer type of width
       exactly 32 bits exists and the standard includes do not define
       UINT32_MAX.])
    ;;
  esac
])