diff options
Diffstat (limited to 'gnulib-m4/frexpl.m4')
| -rw-r--r-- | gnulib-m4/frexpl.m4 | 143 |
1 files changed, 92 insertions, 51 deletions
diff --git a/gnulib-m4/frexpl.m4 b/gnulib-m4/frexpl.m4 index 80165204..cd3ac6e5 100644 --- a/gnulib-m4/frexpl.m4 +++ b/gnulib-m4/frexpl.m4 @@ -1,5 +1,5 @@ -# frexpl.m4 serial 9 -dnl Copyright (C) 2007-2010 Free Software Foundation, Inc. +# frexpl.m4 serial 20 +dnl Copyright (C) 2007-2015 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. @@ -7,29 +7,29 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_FREXPL], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) + AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) + + dnl Persuade glibc <math.h> to declare frexpl(). + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + dnl Check whether it's declared. - dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>. - AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include <math.h>]) + dnl Mac OS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>. + AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include <math.h>]]) + FREXPL_LIBM= if test $HAVE_DECL_FREXPL = 1; then - AC_CACHE_CHECK([whether frexpl() can be used without linking with libm], - [gl_cv_func_frexpl_no_libm], - [ - AC_TRY_LINK([#include <math.h> - long double x;], - [int e; return frexpl (x, &e) > 0;], - [gl_cv_func_frexpl_no_libm=yes], - [gl_cv_func_frexpl_no_libm=no]) - ]) + gl_CHECK_FREXPL_NO_LIBM if test $gl_cv_func_frexpl_no_libm = no; then AC_CACHE_CHECK([whether frexpl() can be used with libm], [gl_cv_func_frexpl_in_libm], [ save_LIBS="$LIBS" LIBS="$LIBS -lm" - AC_TRY_LINK([#include <math.h> - long double x;], - [int e; return frexpl (x, &e) > 0;], + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <math.h> + long double x;]], + [[int e; return frexpl (x, &e) > 0;]])], [gl_cv_func_frexpl_in_libm=yes], [gl_cv_func_frexpl_in_libm=no]) LIBS="$save_LIBS" @@ -46,7 +46,7 @@ AC_DEFUN([gl_FUNC_FREXPL], LIBS="$save_LIBS" case "$gl_cv_func_frexpl_works" in *yes) gl_func_frexpl=yes ;; - *) gl_func_frexpl=no; REPLACE_FREXPL=1; FREXPL_LIBM= ;; + *) gl_func_frexpl=no; REPLACE_FREXPL=1 ;; esac else gl_func_frexpl=no @@ -57,7 +57,13 @@ AC_DEFUN([gl_FUNC_FREXPL], fi fi if test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl = no; then - AC_LIBOBJ([frexpl]) + dnl Find libraries needed to link lib/frexpl.c. + if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then + AC_REQUIRE([gl_FUNC_FREXP]) + FREXPL_LIBM="$FREXP_LIBM" + else + FREXPL_LIBM= + fi fi AC_SUBST([FREXPL_LIBM]) ]) @@ -65,19 +71,12 @@ AC_DEFUN([gl_FUNC_FREXPL], AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) + AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) dnl Check whether it's declared. - dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>. - AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include <math.h>]) + dnl Mac OS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>. + AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [[#include <math.h>]]) if test $HAVE_DECL_FREXPL = 1; then - AC_CACHE_CHECK([whether frexpl() can be used without linking with libm], - [gl_cv_func_frexpl_no_libm], - [ - AC_TRY_LINK([#include <math.h> - long double x;], - [int e; return frexpl (x, &e) > 0;], - [gl_cv_func_frexpl_no_libm=yes], - [gl_cv_func_frexpl_no_libm=no]) - ]) + gl_CHECK_FREXPL_NO_LIBM if test $gl_cv_func_frexpl_no_libm = yes; then gl_FUNC_FREXPL_WORKS case "$gl_cv_func_frexpl_works" in @@ -94,14 +93,28 @@ AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM], [Define if the frexpl() function is available in libc.]) fi fi - if test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl_no_libm = no; then - AC_LIBOBJ([frexpl]) - fi +]) + +dnl Test whether frexpl() can be used without linking with libm. +dnl Set gl_cv_func_frexpl_no_libm to 'yes' or 'no' accordingly. +AC_DEFUN([gl_CHECK_FREXPL_NO_LIBM], +[ + AC_CACHE_CHECK([whether frexpl() can be used without linking with libm], + [gl_cv_func_frexpl_no_libm], + [ + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <math.h> + long double x;]], + [[int e; return frexpl (x, &e) > 0;]])], + [gl_cv_func_frexpl_no_libm=yes], + [gl_cv_func_frexpl_no_libm=no]) + ]) ]) dnl Test whether frexpl() works on finite numbers (this fails on -dnl MacOS X 10.4/PowerPC, on AIX 5.1, and on BeOS), on denormalized numbers -dnl (this fails on MacOS X 10.5/i386), and also on infinite numbers (this +dnl Mac OS X 10.4/PowerPC, on AIX 5.1, and on BeOS), on denormalized numbers +dnl (this fails on Mac OS X 10.5/i386), and also on infinite numbers (this dnl fails e.g. on IRIX 6.5 and mingw). AC_DEFUN([gl_FUNC_FREXPL_WORKS], [ @@ -109,7 +122,8 @@ AC_DEFUN([gl_FUNC_FREXPL_WORKS], AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether frexpl works], [gl_cv_func_frexpl_works], [ - AC_TRY_RUN([ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ #include <float.h> #include <math.h> /* Override the values of <float.h>, like done in float.in.h. */ @@ -117,9 +131,28 @@ AC_DEFUN([gl_FUNC_FREXPL_WORKS], # undef LDBL_MIN_EXP # define LDBL_MIN_EXP (-16381) #endif -extern long double frexpl (long double, int *); +#if defined __i386__ && defined __FreeBSD__ +# undef LDBL_MIN_EXP +# define LDBL_MIN_EXP (-16381) +#endif +#if (defined _ARCH_PPC || defined _POWER) && defined _AIX && (LDBL_MANT_DIG == 106) && defined __GNUC__ +# undef LDBL_MIN_EXP +# define LDBL_MIN_EXP DBL_MIN_EXP +#endif +#if defined __sgi && (LDBL_MANT_DIG >= 106) +# if defined __GNUC__ +# undef LDBL_MIN_EXP +# define LDBL_MIN_EXP DBL_MIN_EXP +# endif +#endif +extern +#ifdef __cplusplus +"C" +#endif +long double frexpl (long double, int *); int main() { + int result = 0; volatile long double x; /* Test on finite numbers that fails on AIX 5.1. */ x = 16.0L; @@ -127,9 +160,9 @@ int main() int exp = -9999; frexpl (x, &exp); if (exp != 5) - return 1; + result |= 1; } - /* Test on finite numbers that fails on MacOS X 10.4, because its frexpl + /* Test on finite numbers that fails on Mac OS X 10.4, because its frexpl function returns an invalid (incorrectly normalized) value: it returns y = { 0x3fe028f5, 0xc28f5c28, 0x3c9eb851, 0xeb851eb8 } but the correct result is @@ -139,7 +172,7 @@ int main() int exp = -9999; long double y = frexpl (x, &exp); if (!(exp == 1 && y == 0.505L)) - return 1; + result |= 2; } /* Test on large finite numbers. This fails on BeOS at i = 16322, while LDBL_MAX_EXP = 16384. @@ -152,7 +185,10 @@ int main() int exp = -9999; frexpl (x, &exp); if (exp != i) - return 1; + { + result |= 4; + break; + } } } /* Test on denormalized numbers. */ @@ -165,9 +201,9 @@ int main() int exp; long double y = frexpl (x, &exp); /* On machines with IEEE854 arithmetic: x = 1.68105e-4932, - exp = -16382, y = 0.5. On MacOS X 10.5: exp = -16384, y = 0.5. */ + exp = -16382, y = 0.5. On Mac OS X 10.5: exp = -16384, y = 0.5. */ if (exp != LDBL_MIN_EXP - 1) - return 1; + result |= 8; } } /* Test on infinite numbers. */ @@ -176,15 +212,20 @@ int main() int exp; long double y = frexpl (x, &exp); if (y != x) - return 1; + result |= 16; } - return 0; -}], [gl_cv_func_frexpl_works=yes], [gl_cv_func_frexpl_works=no], - [case "$host_os" in - aix* | beos* | darwin* | irix* | mingw* | pw*) - gl_cv_func_frexpl_works="guessing no";; - *) gl_cv_func_frexpl_works="guessing yes";; - esac - ]) + return result; +}]])], + [gl_cv_func_frexpl_works=yes], + [gl_cv_func_frexpl_works=no], + [ +changequote(,)dnl + case "$host_os" in + aix | aix[3-6]* | beos* | darwin* | irix* | mingw* | pw*) + gl_cv_func_frexpl_works="guessing no";; + *) gl_cv_func_frexpl_works="guessing yes";; + esac +changequote([,])dnl + ]) ]) ]) |