Home | History | Annotate | Line # | Download | only in m4 
      1 # stdint.m4 serial 4
      2 dnl Copyright (C) 2001-2002, 2004-2005 Free Software Foundation, Inc.
      3 dnl This file is free software; the Free Software Foundation
      4 dnl gives unlimited permission to copy and/or distribute it,
      5 dnl with or without modifications, as long as this notice is preserved.
      6 
      7 dnl From Bruno Haible.
      8 dnl Test whether <stdint.h> is supported or must be substituted.
      9 
     10 AC_DEFUN([gl_STDINT_H],
     11 [dnl Check for <inttypes.h>.
     12 AC_REQUIRE([gt_HEADER_INTTYPES_H])
     13 dnl Check for <sys/inttypes.h>.
     14 AC_CHECK_HEADERS([sys/inttypes.h])
     15 
     16 AC_MSG_CHECKING([for stdint.h])
     17 AC_CACHE_VAL(gl_cv_header_stdint_h, [
     18   AC_TRY_COMPILE([#include <stdint.h>], [],
     19     gl_cv_header_stdint_h=yes, gl_cv_header_stdint_h=no)])
     20 AC_MSG_RESULT([$gl_cv_header_stdint_h])
     21 if test $gl_cv_header_stdint_h = yes; then
     22   AC_DEFINE(HAVE_STDINT_H, 1,
     23             [Define if you have a working <stdint.h> header file.])
     24   STDINT_H=''
     25 else
     26   STDINT_H='stdint.h'
     27 
     28   dnl Is long == int64_t ?
     29   AC_CACHE_CHECK([whether 'long' is 64 bit wide], gl_cv_long_bitsize_64, [
     30     AC_TRY_COMPILE([
     31 #define POW63  ((((((long) 1 << 15) << 15) << 15) << 15) << 3)
     32 #define POW64  ((((((long) 1 << 15) << 15) << 15) << 15) << 4)
     33 typedef int array [2 * (POW63 != 0 && POW64 == 0) - 1];
     34 ], , gl_cv_long_bitsize_64=yes, gl_cv_long_bitsize_64=no)])
     35   if test $gl_cv_long_bitsize_64 = yes; then
     36     HAVE_LONG_64BIT=1
     37   else
     38     HAVE_LONG_64BIT=0
     39   fi
     40   AC_SUBST(HAVE_LONG_64BIT)
     41 
     42   dnl Is long long == int64_t ?
     43   AC_CACHE_CHECK([whether 'long long' is 64 bit wide], gl_cv_longlong_bitsize_64, [
     44     AC_TRY_COMPILE([
     45 #define POW63  ((((((long long) 1 << 15) << 15) << 15) << 15) << 3)
     46 #define POW64  ((((((long long) 1 << 15) << 15) << 15) << 15) << 4)
     47 typedef int array [2 * (POW63 != 0 && POW64 == 0) - 1];
     48 ], , gl_cv_longlong_bitsize_64=yes, gl_cv_longlong_bitsize_64=no)])
     49   if test $gl_cv_longlong_bitsize_64 = yes; then
     50     HAVE_LONG_LONG_64BIT=1
     51   else
     52     HAVE_LONG_LONG_64BIT=0
     53   fi
     54   AC_SUBST(HAVE_LONG_LONG_64BIT)
     55 
     56 fi
     57 AC_SUBST(STDINT_H)
     58 ])
     59