Mercurial > gnulib
view m4/modff.m4 @ 40177:dcd889592b62
dtoastr,ftoastr,ldtoastr: port to c-strtod changes
Decouple these modules from c-strtod. Nowadays it’s reasonable to
assume the C99 signatures for strtod and strtold. Programs that
require stricter adherence to C99 should also use the strtod and
strtold modules as needed, and we no longer need the
HAVE_C99_STRTOLD macro.
* NEWS: Mention this.
* lib/ftoastr.c (STRTOF) [LENGTH == 3]: Assume strtold.
* m4/c-strtod.m4 (gl_C_STRTOLD): Do not define HAVE_C99_STRTOLD.
* modules/dtoastr, modules/ftoastr, modules/ldtoastr:
(Files): Remove m4/c-strtod.m4.
(configure.ac): Do not require gl_C99_STRTOLD, which no longer
exists.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sat, 02 Feb 2019 13:01:55 -0800 |
parents | e2e6dc79463b |
children |
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# modff.m4 serial 8 dnl Copyright (C) 2011-2019 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. AC_DEFUN([gl_FUNC_MODFF], [ m4_divert_text([DEFAULTS], [gl_modff_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_FUNC_MODF]) dnl Persuade glibc <math.h> to declare modff(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether modff() exists. We cannot assume that modff(), if it dnl exists, is defined in the same library as modf(). This is not the case dnl on FreeBSD, NetBSD, OpenBSD. gl_MATHFUNC([modff], [float], [(float, float *)]) if test $gl_cv_func_modff_no_libm = yes \ || test $gl_cv_func_modff_in_libm = yes; then : m4_ifdef([gl_FUNC_MODFF_IEEE], [ if test $gl_modff_required = ieee && test $REPLACE_MODFF = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether modff works according to ISO C 99 with IEC 60559], [gl_cv_func_modff_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $MODFF_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> ]gl_FLOAT_MINUS_ZERO_CODE[ ]gl_FLOAT_SIGNBIT_CODE[ /* Compare two numbers with ==. This is a separate function because IRIX 6.5 "cc -O" miscompiles an 'x == x' test. */ static int numeric_equal (float x, float y) { return x == y; } static float dummy (float x, float *iptr) { return 0; } float zero; float minus_one = - 1.0f; int main (int argc, char *argv[]) { float (* volatile my_modff) (float, float *) = argc ? modff : dummy; int result = 0; float i; float f; /* Test modff(NaN,...). This test fails on NetBSD 5.1, OpenBSD 4.9, Solaris 9, Cygwin. */ f = my_modff (zero / zero, &i); if (numeric_equal (f, f)) result |= 1; /* Test modff(-Inf,...). This test fails on IRIX 6.5, OSF/1 5.1, mingw. */ f = my_modff (minus_one / zero, &i); if (!(f == 0.0f) || (signbitf (minus_zerof) && !signbitf (f))) result |= 2; return result; } ]])], [gl_cv_func_modff_ieee=yes], [gl_cv_func_modff_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_modff_ieee="guessing yes" ;; # Guess yes on MSVC, no on mingw. mingw*) AC_EGREP_CPP([Known], [ #ifdef _MSC_VER Known #endif ], [gl_cv_func_modff_ieee="guessing yes"], [gl_cv_func_modff_ieee="guessing no"]) ;; # If we don't know, assume the worst. *) gl_cv_func_modff_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_modff_ieee" in *yes) ;; *) REPLACE_MODFF=1 ;; esac fi ]) else HAVE_MODFF=0 fi if test $HAVE_MODFF = 0 || test $REPLACE_MODFF = 1; then dnl Find libraries needed to link lib/modff.c. MODFF_LIBM="$MODF_LIBM" fi AC_SUBST([MODFF_LIBM]) ])