Mercurial > gnulib
view m4/isnand.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 | b06060465f09 |
children |
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# isnand.m4 serial 11 dnl Copyright (C) 2007-2019 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. dnl Check how to get or define isnand(). AC_DEFUN([gl_FUNC_ISNAND], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) ISNAND_LIBM= gl_HAVE_ISNAND_NO_LIBM if test $gl_cv_func_isnand_no_libm = no; then gl_HAVE_ISNAND_IN_LIBM if test $gl_cv_func_isnand_in_libm = yes; then ISNAND_LIBM=-lm fi fi dnl The variable gl_func_isnand set here is used by isnan.m4. if test $gl_cv_func_isnand_no_libm = yes \ || test $gl_cv_func_isnand_in_libm = yes; then gl_func_isnand=yes else gl_func_isnand=no HAVE_ISNAND=0 fi AC_SUBST([ISNAND_LIBM]) ]) dnl Check how to get or define isnand() without linking with libm. AC_DEFUN([gl_FUNC_ISNAND_NO_LIBM], [ gl_HAVE_ISNAND_NO_LIBM gl_func_isnand_no_libm=$gl_cv_func_isnand_no_libm if test $gl_cv_func_isnand_no_libm = yes; then AC_DEFINE([HAVE_ISNAND_IN_LIBC], [1], [Define if the isnan(double) function is available in libc.]) fi ]) dnl Prerequisites of replacement isnand definition. It does not need -lm. AC_DEFUN([gl_PREREQ_ISNAND], [ AC_REQUIRE([gl_DOUBLE_EXPONENT_LOCATION]) ]) dnl Test whether isnand() can be used with libm. AC_DEFUN([gl_HAVE_ISNAND_IN_LIBM], [ AC_CACHE_CHECK([whether isnan(double) can be used with libm], [gl_cv_func_isnand_in_libm], [ save_LIBS="$LIBS" LIBS="$LIBS -lm" AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#include <math.h> #if __GNUC__ >= 4 # undef isnand # define isnand(x) __builtin_isnan ((double)(x)) #elif defined isnan # undef isnand # define isnand(x) isnan ((double)(x)) #endif double x;]], [[return isnand (x);]])], [gl_cv_func_isnand_in_libm=yes], [gl_cv_func_isnand_in_libm=no]) LIBS="$save_LIBS" ]) ]) AC_DEFUN([gl_HAVE_ISNAND_NO_LIBM], [ AC_CACHE_CHECK([whether isnan(double) can be used without linking with libm], [gl_cv_func_isnand_no_libm], [ AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#include <math.h> #if __GNUC__ >= 4 # undef isnand # define isnand(x) __builtin_isnan ((double)(x)) #else # undef isnand # define isnand(x) isnan ((double)(x)) #endif double x;]], [[return isnand (x);]])], [gl_cv_func_isnand_no_libm=yes], [gl_cv_func_isnand_no_libm=no]) ]) ])