X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffrexpl.m4;h=513c12fdb1780c0e2f2fae84bf04c21ed198f344;hb=3b905e0ad791b750d0a471c90ecaacf2345a39c3;hp=ca67add7a5538f2f8a2379c01f2b0473788a3af7;hpb=aecb65d22ea2a79b4f171eeac3031b6db43a49fb;p=gnulib.git diff --git a/m4/frexpl.m4 b/m4/frexpl.m4 index ca67add7a..513c12fdb 100644 --- a/m4/frexpl.m4 +++ b/m4/frexpl.m4 @@ -1,5 +1,5 @@ -# frexpl.m4 serial 2 -dnl Copyright (C) 2007 Free Software Foundation, Inc. +# frexpl.m4 serial 11 +dnl Copyright (C) 2007-2010 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. @@ -7,7 +7,86 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_FREXPL], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) + dnl Check whether it's declared. + dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in . + AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include ]) FREXPL_LIBM= + if test $HAVE_DECL_FREXPL = 1; then + 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="$LIBS -lm" + AC_TRY_LINK([#include + long double x;], + [int e; return frexpl (x, &e) > 0;], + [gl_cv_func_frexpl_in_libm=yes], + [gl_cv_func_frexpl_in_libm=no]) + LIBS="$save_LIBS" + ]) + if test $gl_cv_func_frexpl_in_libm = yes; then + FREXPL_LIBM=-lm + fi + fi + if test $gl_cv_func_frexpl_no_libm = yes \ + || test $gl_cv_func_frexpl_in_libm = yes; then + save_LIBS="$LIBS" + LIBS="$LIBS $FREXPL_LIBM" + gl_FUNC_FREXPL_WORKS + LIBS="$save_LIBS" + case "$gl_cv_func_frexpl_works" in + *yes) gl_func_frexpl=yes ;; + *) gl_func_frexpl=no; REPLACE_FREXPL=1; FREXPL_LIBM= ;; + esac + else + gl_func_frexpl=no + fi + if test $gl_func_frexpl = yes; then + AC_DEFINE([HAVE_FREXPL], [1], + [Define if the frexpl() function is available.]) + fi + fi + if test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl = no; then + AC_LIBOBJ([frexpl]) + fi + AC_SUBST([FREXPL_LIBM]) +]) + +AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM], +[ + AC_REQUIRE([gl_MATH_H_DEFAULTS]) + dnl Check whether it's declared. + dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in . + AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include ]) + if test $HAVE_DECL_FREXPL = 1; then + 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 + *yes) gl_func_frexpl_no_libm=yes ;; + *) gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;; + esac + else + gl_func_frexpl_no_libm=no + dnl Set REPLACE_FREXPL here because the system may have frexpl in libm. + REPLACE_FREXPL=1 + fi + if test $gl_func_frexpl_no_libm = yes; then + AC_DEFINE([HAVE_FREXPL_IN_LIBC], [1], + [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], [ @@ -17,51 +96,12 @@ AC_DEFUN([gl_FUNC_FREXPL], [gl_cv_func_frexpl_no_libm=yes], [gl_cv_func_frexpl_no_libm=no]) ]) - 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="$LIBS -lm" - AC_TRY_LINK([#include - long double x;], - [int e; return frexpl (x, &e) > 0;], - [gl_cv_func_frexpl_in_libm=yes], - [gl_cv_func_frexpl_in_libm=no]) - LIBS="$save_LIBS" - ]) - if test $gl_cv_func_frexpl_in_libm = yes; then - FREXPL_LIBM=-lm - fi - fi - if test $gl_cv_func_frexpl_no_libm = yes \ - || test $gl_cv_func_frexpl_in_libm = yes; then - save_LIBS="$LIBS" - LIBS="$LIBS $FREXPL_LIBM" - gl_FUNC_FREXPL_WORKS - LIBS="$save_LIBS" - case "$gl_cv_func_frexpl_works" in - *yes) gl_func_frexpl=yes ;; - *) gl_func_frexpl=no; REPLACE_FREXPL=1; FREXPL_LIBM= ;; - esac - else - gl_func_frexpl=no - fi - if test $gl_func_frexpl = yes; then - AC_DEFINE([HAVE_FREXPL], 1, - [Define if the frexpl() function is available.]) - dnl Also check whether it's declared. - dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in . - AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include ]) - else - HAVE_DECL_FREXPL=0 - AC_LIBOBJ([frexpl]) - fi - AC_SUBST([FREXPL_LIBM]) ]) -dnl Test whether frexpl() works on finite numbers (this fails on AIX 5.1) and -dnl also on infinite numbers (this fails e.g. on IRIX 6.5). +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 fails e.g. on IRIX 6.5 and mingw). AC_DEFUN([gl_FUNC_FREXPL_WORKS], [ AC_REQUIRE([AC_PROG_CC]) @@ -69,22 +109,69 @@ AC_DEFUN([gl_FUNC_FREXPL_WORKS], AC_CACHE_CHECK([whether frexpl works], [gl_cv_func_frexpl_works], [ AC_TRY_RUN([ +#include #include +/* Override the values of , like done in float.in.h. */ +#if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__) +# undef LDBL_MIN_EXP +# define LDBL_MIN_EXP (-16381) +#endif extern long double frexpl (long double, int *); int main() { volatile long double x; - /* Test on finite numbers. */ + /* Test on finite numbers that fails on AIX 5.1. */ + x = 16.0L; { int exp = -9999; - x = 16.0L; frexpl (x, &exp); if (exp != 5) return 1; } + /* Test on finite numbers that fails on MacOS 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 + 0.505L = { 0x3fe028f5, 0xc28f5c29, 0xbc547ae1, 0x47ae1480 } */ + x = 1.01L; + { + int exp = -9999; + long double y = frexpl (x, &exp); + if (!(exp == 1 && y == 0.505L)) + return 1; + } + /* Test on large finite numbers. This fails on BeOS at i = 16322, while + LDBL_MAX_EXP = 16384. + In the loop end test, we test x against Infinity, rather than comparing + i with LDBL_MAX_EXP, because BeOS has a wrong LDBL_MAX_EXP. */ + { + int i; + for (i = 1, x = 1.0L; x != x + x; i++, x *= 2.0L) + { + int exp = -9999; + frexpl (x, &exp); + if (exp != i) + return 1; + } + } + /* Test on denormalized numbers. */ + { + int i; + for (i = 1, x = 1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L) + ; + if (x > 0.0L) + { + 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. */ + if (exp != LDBL_MIN_EXP - 1) + return 1; + } + } /* Test on infinite numbers. */ + x = 1.0L / 0.0L; { - x = 1.0L / 0.0L; int exp; long double y = frexpl (x, &exp); if (y != x) @@ -92,10 +179,14 @@ int main() } return 0; }], [gl_cv_func_frexpl_works=yes], [gl_cv_func_frexpl_works=no], - [case "$host_os" in - aix* | irix*) gl_cv_func_frexpl_works="guessing no";; - *) gl_cv_func_frexpl_works="guessing yes";; + [ +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 ]) ]) ])