gdb/gnulib/m4/longlong.m4 - Issue 11969036: Merge GDB 7.5.1

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Issue 11969036: Merge GDB 7.5.1 (Closed) Base URL: http://git.chromium.org/native_client/nacl-gdb.git@master

Patch Set: Created 7 years, 11 months ago

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1 # longlong.m4 serial 14

2 dnl Copyright (C) 1999-2007, 2009-2011 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 Paul Eggert.

8

9 # Define HAVE_LONG_LONG_INT if 'long long int' works.

10 # This fixes a bug in Autoconf 2.61, but can be removed once we

11 # assume 2.62 everywhere.

12

13 # Note: If the type 'long long int' exists but is only 32 bits large

14 # (as on some very old compilers), HAVE_LONG_LONG_INT will not be

15 # defined. In this case you can treat 'long long int' like 'long int'.

16

17 AC_DEFUN([AC_TYPE_LONG_LONG_INT],

18 [

19 AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],

20 [AC_LINK_IFELSE(

21 [_AC_TYPE_LONG_LONG_SNIPPET],

22 [dnl This catches a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.

23 dnl If cross compiling, assume the bug isn't important, since

24 dnl nobody cross compiles for this platform as far as we know.

25 AC_RUN_IFELSE(

26 [AC_LANG_PROGRAM(

27 [[@%:@include <limits.h>

28 @%:@ifndef LLONG_MAX

29 @%:@ define HALF \

30 (1LL << (sizeof (long long int) * CHAR_BIT - 2))

31 @%:@ define LLONG_MAX (HALF - 1 + HALF)

32 @%:@endif]],

33 [[long long int n = 1;

34 int i;

35 for (i = 0; ; i++)

36 {

37 long long int m = n << i;

38 if (m >> i != n)

39 return 1;

40 if (LLONG_MAX / 2 < m)

41 break;

42 }

43 return 0;]])],

44 [ac_cv_type_long_long_int=yes],

45 [ac_cv_type_long_long_int=no],

46 [ac_cv_type_long_long_int=yes])],

47 [ac_cv_type_long_long_int=no])])

48 if test $ac_cv_type_long_long_int = yes; then

49 AC_DEFINE([HAVE_LONG_LONG_INT], [1],

50 [Define to 1 if the system has the type `long long int'.])

51 fi

52 ])

53

54 # Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.

55 # This fixes a bug in Autoconf 2.61, but can be removed once we

56 # assume 2.62 everywhere.

57

58 # Note: If the type 'unsigned long long int' exists but is only 32 bits

59 # large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT

60 # will not be defined. In this case you can treat 'unsigned long long int'

61 # like 'unsigned long int'.

62

63 AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],

64 [

65 AC_CACHE_CHECK([for unsigned long long int],

66 [ac_cv_type_unsigned_long_long_int],

67 [AC_LINK_IFELSE(

68 [_AC_TYPE_LONG_LONG_SNIPPET],

69 [ac_cv_type_unsigned_long_long_int=yes],

70 [ac_cv_type_unsigned_long_long_int=no])])

71 if test $ac_cv_type_unsigned_long_long_int = yes; then

72 AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1],

73 [Define to 1 if the system has the type `unsigned long long int'.])

74 fi

75 ])

76

77 # Expands to a C program that can be used to test for simultaneous support

78 # of 'long long' and 'unsigned long long'. We don't want to say that

79 # 'long long' is available if 'unsigned long long' is not, or vice versa,

80 # because too many programs rely on the symmetry between signed and unsigned

81 # integer types (excluding 'bool').

82 AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],

83 [

84 AC_LANG_PROGRAM(

85 [[/* For now, do not test the preprocessor; as of 2007 there are too many

86 implementations with broken preprocessors. Perhaps this can

87 be revisited in 2012. In the meantime, code should not expect

88 #if to work with literals wider than 32 bits. */

89 /* Test literals. */

90 long long int ll = 9223372036854775807ll;

91 long long int nll = -9223372036854775807LL;

92 unsigned long long int ull = 18446744073709551615ULL;

93 /* Test constant expressions. */

94 typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)

95 ? 1 : -1)];

96 typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1

97 ? 1 : -1)];

98 int i = 63;]],

99 [[/* Test availability of runtime routines for shift and division. */

100 long long int llmax = 9223372036854775807ll;

101 unsigned long long int ullmax = 18446744073709551615ull;

102 return ((ll << 63) \| (ll >> 63) \| (ll < i) \| (ll > i)

103 \| (llmax / ll) \| (llmax % ll)

104 \| (ull << 63) \| (ull >> 63) \| (ull << i) \| (ull >> i)

105 \| (ullmax / ull) \| (ullmax % ull));]])

106 ])

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