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113 lines
4.6 KiB
113 lines
4.6 KiB
# longlong.m4 serial 17 |
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dnl Copyright (C) 1999-2007, 2009-2017 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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dnl From Paul Eggert. |
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# Define HAVE_LONG_LONG_INT if 'long long int' works. |
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# This fixes a bug in Autoconf 2.61, and can be faster |
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# than what's in Autoconf 2.62 through 2.68. |
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# Note: If the type 'long long int' exists but is only 32 bits large |
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# (as on some very old compilers), HAVE_LONG_LONG_INT will not be |
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# defined. In this case you can treat 'long long int' like 'long int'. |
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AC_DEFUN([AC_TYPE_LONG_LONG_INT], |
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[ |
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AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT]) |
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AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int], |
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[ac_cv_type_long_long_int=yes |
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if test "x${ac_cv_prog_cc_c99-no}" = xno; then |
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ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int |
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if test $ac_cv_type_long_long_int = yes; then |
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dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004. |
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dnl If cross compiling, assume the bug is not important, since |
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dnl nobody cross compiles for this platform as far as we know. |
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AC_RUN_IFELSE( |
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[AC_LANG_PROGRAM( |
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[[@%:@include <limits.h> |
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@%:@ifndef LLONG_MAX |
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@%:@ define HALF \ |
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(1LL << (sizeof (long long int) * CHAR_BIT - 2)) |
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@%:@ define LLONG_MAX (HALF - 1 + HALF) |
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@%:@endif]], |
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[[long long int n = 1; |
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int i; |
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for (i = 0; ; i++) |
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{ |
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long long int m = n << i; |
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if (m >> i != n) |
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return 1; |
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if (LLONG_MAX / 2 < m) |
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break; |
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} |
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return 0;]])], |
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[], |
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[ac_cv_type_long_long_int=no], |
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[:]) |
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fi |
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fi]) |
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if test $ac_cv_type_long_long_int = yes; then |
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AC_DEFINE([HAVE_LONG_LONG_INT], [1], |
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[Define to 1 if the system has the type 'long long int'.]) |
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fi |
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]) |
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# Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works. |
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# This fixes a bug in Autoconf 2.61, and can be faster |
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# than what's in Autoconf 2.62 through 2.68. |
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# Note: If the type 'unsigned long long int' exists but is only 32 bits |
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# large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT |
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# will not be defined. In this case you can treat 'unsigned long long int' |
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# like 'unsigned long int'. |
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AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT], |
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[ |
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AC_CACHE_CHECK([for unsigned long long int], |
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[ac_cv_type_unsigned_long_long_int], |
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[ac_cv_type_unsigned_long_long_int=yes |
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if test "x${ac_cv_prog_cc_c99-no}" = xno; then |
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AC_LINK_IFELSE( |
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[_AC_TYPE_LONG_LONG_SNIPPET], |
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[], |
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[ac_cv_type_unsigned_long_long_int=no]) |
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fi]) |
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if test $ac_cv_type_unsigned_long_long_int = yes; then |
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AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1], |
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[Define to 1 if the system has the type 'unsigned long long int'.]) |
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fi |
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]) |
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# Expands to a C program that can be used to test for simultaneous support |
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# of 'long long' and 'unsigned long long'. We don't want to say that |
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# 'long long' is available if 'unsigned long long' is not, or vice versa, |
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# because too many programs rely on the symmetry between signed and unsigned |
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# integer types (excluding 'bool'). |
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AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET], |
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[ |
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AC_LANG_PROGRAM( |
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[[/* For now, do not test the preprocessor; as of 2007 there are too many |
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implementations with broken preprocessors. Perhaps this can |
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be revisited in 2012. In the meantime, code should not expect |
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#if to work with literals wider than 32 bits. */ |
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/* Test literals. */ |
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long long int ll = 9223372036854775807ll; |
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long long int nll = -9223372036854775807LL; |
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unsigned long long int ull = 18446744073709551615ULL; |
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/* Test constant expressions. */ |
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typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll) |
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? 1 : -1)]; |
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typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1 |
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? 1 : -1)]; |
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int i = 63;]], |
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[[/* Test availability of runtime routines for shift and division. */ |
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long long int llmax = 9223372036854775807ll; |
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unsigned long long int ullmax = 18446744073709551615ull; |
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return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i) |
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| (llmax / ll) | (llmax % ll) |
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| (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i) |
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| (ullmax / ull) | (ullmax % ull));]]) |
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])
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