X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Flonglong.m4;h=aed816cfa5e46efe628199bf956a0914cb0d883e;hb=9f60473985e5f20c3efabadf2c1756b5ff560458;hp=5799c3965aaba7f00167ba025f5f0b74643235df;hpb=e3958d5c146d2b396c3de525ac2dfb896a03f061;p=gnulib.git diff --git a/m4/longlong.m4 b/m4/longlong.m4 index 5799c3965..aed816cfa 100644 --- a/m4/longlong.m4 +++ b/m4/longlong.m4 @@ -1,5 +1,5 @@ -# longlong.m4 serial 11 -dnl Copyright (C) 1999-2007 Free Software Foundation, Inc. +# longlong.m4 serial 16 +dnl Copyright (C) 1999-2007, 2009-2011 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. @@ -7,8 +7,8 @@ dnl with or without modifications, as long as this notice is preserved. dnl From Paul Eggert. # Define HAVE_LONG_LONG_INT if 'long long int' works. -# This fixes a bug in Autoconf 2.61, but can be removed once we -# assume 2.62 everywhere. +# This fixes a bug in Autoconf 2.61, and can be faster +# than what's in Autoconf 2.62 through 2.68. # Note: If the type 'long long int' exists but is only 32 bits large # (as on some very old compilers), HAVE_LONG_LONG_INT will not be @@ -16,60 +16,98 @@ dnl From Paul Eggert. AC_DEFUN([AC_TYPE_LONG_LONG_INT], [ + AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT]) AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int], - [AC_LINK_IFELSE( - [AC_LANG_PROGRAM( - [[#if ! (-9223372036854775807LL < 0 && 0 < 9223372036854775807ll) - error in preprocessor; - #endif - long long int ll = 9223372036854775807ll; - long long int nll = -9223372036854775807LL; - typedef int a[((-9223372036854775807LL < 0 - && 0 < 9223372036854775807ll) - ? 1 : -1)]; - int i = 63;]], - [[long long int llmax = 9223372036854775807ll; - return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i) - | (llmax / ll) | (llmax % ll));]])], - [dnl This catches a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004. - dnl If cross compiling, assume the bug isn't important, since - dnl nobody cross compiles for this platform as far as we know. - AC_RUN_IFELSE( - [AC_LANG_PROGRAM( - [[@%:@include - @%:@ifndef LLONG_MAX - @%:@ define HALF \ - (1LL << (sizeof (long long int) * CHAR_BIT - 2)) - @%:@ define LLONG_MAX (HALF - 1 + HALF) - @%:@endif]], - [[long long int n = 1; - int i; - for (i = 0; ; i++) - { - long long int m = n << i; - if (m >> i != n) - return 1; - if (LLONG_MAX / 2 < m) - break; - } - return 0;]])], - [ac_cv_type_long_long_int=yes], - [ac_cv_type_long_long_int=no], - [ac_cv_type_long_long_int=yes])], - [ac_cv_type_long_long_int=no])]) + [ac_cv_type_long_long_int=yes + if test "x${ac_cv_prog_cc_c99-no}" = xno; then + ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int + if test $ac_cv_type_long_long_int = yes; then + dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004. + dnl If cross compiling, assume the bug is not important, since + dnl nobody cross compiles for this platform as far as we know. + AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [[@%:@include + @%:@ifndef LLONG_MAX + @%:@ define HALF \ + (1LL << (sizeof (long long int) * CHAR_BIT - 2)) + @%:@ define LLONG_MAX (HALF - 1 + HALF) + @%:@endif]], + [[long long int n = 1; + int i; + for (i = 0; ; i++) + { + long long int m = n << i; + if (m >> i != n) + return 1; + if (LLONG_MAX / 2 < m) + break; + } + return 0;]])], + [], + [ac_cv_type_long_long_int=no], + [:]) + fi + fi]) if test $ac_cv_type_long_long_int = yes; then - AC_DEFINE([HAVE_LONG_LONG_INT], 1, + AC_DEFINE([HAVE_LONG_LONG_INT], [1], [Define to 1 if the system has the type `long long int'.]) fi ]) -# This macro is obsolescent and should go away soon. -AC_DEFUN([gl_AC_TYPE_LONG_LONG], +# Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works. +# This fixes a bug in Autoconf 2.61, and can be faster +# than what's in Autoconf 2.62 through 2.68. + +# Note: If the type 'unsigned long long int' exists but is only 32 bits +# large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT +# will not be defined. In this case you can treat 'unsigned long long int' +# like 'unsigned long int'. + +AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT], [ - AC_REQUIRE([AC_TYPE_LONG_LONG_INT]) - ac_cv_type_long_long=$ac_cv_type_long_long_int - if test $ac_cv_type_long_long = yes; then - AC_DEFINE(HAVE_LONG_LONG, 1, - [Define if you have the 'long long' type.]) + AC_CACHE_CHECK([for unsigned long long int], + [ac_cv_type_unsigned_long_long_int], + [ac_cv_type_unsigned_long_long_int=yes + if test "x${ac_cv_prog_cc_c99-no}" = xno; then + AC_LINK_IFELSE( + [_AC_TYPE_LONG_LONG_SNIPPET], + [], + [ac_cv_type_unsigned_long_long_int=no]) + fi]) + if test $ac_cv_type_unsigned_long_long_int = yes; then + AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1], + [Define to 1 if the system has the type `unsigned long long int'.]) fi ]) + +# Expands to a C program that can be used to test for simultaneous support +# of 'long long' and 'unsigned long long'. We don't want to say that +# 'long long' is available if 'unsigned long long' is not, or vice versa, +# because too many programs rely on the symmetry between signed and unsigned +# integer types (excluding 'bool'). +AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET], +[ + AC_LANG_PROGRAM( + [[/* For now, do not test the preprocessor; as of 2007 there are too many + implementations with broken preprocessors. Perhaps this can + be revisited in 2012. In the meantime, code should not expect + #if to work with literals wider than 32 bits. */ + /* Test literals. */ + long long int ll = 9223372036854775807ll; + long long int nll = -9223372036854775807LL; + unsigned long long int ull = 18446744073709551615ULL; + /* Test constant expressions. */ + typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll) + ? 1 : -1)]; + typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1 + ? 1 : -1)]; + int i = 63;]], + [[/* Test availability of runtime routines for shift and division. */ + long long int llmax = 9223372036854775807ll; + unsigned long long int ullmax = 18446744073709551615ull; + return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i) + | (llmax / ll) | (llmax % ll) + | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i) + | (ullmax / ull) | (ullmax % ull));]]) +])