Mercurial > gnulib
view m4/tanl.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 |
line wrap: on
line source
# tanl.m4 serial 8 dnl Copyright (C) 2010-2019 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_TANL], [ AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) dnl Persuade glibc <math.h> to declare tanl(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) TANL_LIBM= AC_CACHE_CHECK([whether tanl() can be used without linking with libm], [gl_cv_func_tanl_no_libm], [ AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> long double (*funcptr) (long double) = tanl; long double x;]], [[return funcptr (x) > 0.4 || tanl (x) > 0.4;]])], [gl_cv_func_tanl_no_libm=yes], [gl_cv_func_tanl_no_libm=no]) ]) if test $gl_cv_func_tanl_no_libm = no; then AC_CACHE_CHECK([whether tanl() can be used with libm], [gl_cv_func_tanl_in_libm], [ save_LIBS="$LIBS" LIBS="$LIBS -lm" AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> long double (*funcptr) (long double) = tanl; long double x;]], [[return funcptr (x) > 0.4 || tanl (x) > 0.4;]])], [gl_cv_func_tanl_in_libm=yes], [gl_cv_func_tanl_in_libm=no]) LIBS="$save_LIBS" ]) if test $gl_cv_func_tanl_in_libm = yes; then TANL_LIBM=-lm fi fi if test $gl_cv_func_tanl_no_libm = yes \ || test $gl_cv_func_tanl_in_libm = yes; then dnl Also check whether it's declared. dnl Mac OS X 10.3 has tanl() in libc but doesn't declare it in <math.h>. AC_CHECK_DECL([tanl], , [HAVE_DECL_TANL=0], [[#include <math.h>]]) else HAVE_DECL_TANL=0 HAVE_TANL=0 dnl Find libraries needed to link lib/tanl.c, lib/trigl.c. if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then AC_REQUIRE([gl_FUNC_TAN]) TANL_LIBM="$TAN_LIBM" else AC_REQUIRE([gl_FUNC_ISNANL]) AC_REQUIRE([gl_FUNC_FLOOR]) AC_REQUIRE([gl_FUNC_FLOORL]) dnl Append $ISNANL_LIBM to TANL_LIBM, avoiding gratuitous duplicates. case " $TANL_LIBM " in *" $ISNANL_LIBM "*) ;; *) TANL_LIBM="$TANL_LIBM $ISNANL_LIBM" ;; esac dnl Append $FLOOR_LIBM to TANL_LIBM, avoiding gratuitous duplicates. case " $TANL_LIBM " in *" $FLOOR_LIBM "*) ;; *) TANL_LIBM="$TANL_LIBM $FLOOR_LIBM" ;; esac dnl Append $FLOORL_LIBM to TANL_LIBM, avoiding gratuitous duplicates. case " $TANL_LIBM " in *" $FLOORL_LIBM "*) ;; *) TANL_LIBM="$TANL_LIBM $FLOORL_LIBM" ;; esac fi fi AC_SUBST([TANL_LIBM]) ])