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.
8 dnl Test whether <stdint.h> is supported or must be substituted.
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])
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.])
28 dnl Is long == int64_t ?
29 AC_CACHE_CHECK([whether 'long' is 64 bit wide], gl_cv_long_bitsize_64, [
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
40 AC_SUBST(HAVE_LONG_64BIT)
42 dnl Is long long == int64_t ?
43 AC_CACHE_CHECK([whether 'long long' is 64 bit wide], gl_cv_longlong_bitsize_64, [
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
52 HAVE_LONG_LONG_64BIT=0
54 AC_SUBST(HAVE_LONG_LONG_64BIT)