Mercurial > gnulib
view m4/ceilf.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 |
line wrap: on
line source
# ceilf.m4 serial 17 dnl Copyright (C) 2007, 2009-2019 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_CEILF], [ m4_divert_text([DEFAULTS], [gl_ceilf_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) dnl Persuade glibc <math.h> to declare ceilf(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether ceilf() is declared. AC_CHECK_DECLS([ceilf], , , [[#include <math.h>]]) if test "$ac_cv_have_decl_ceilf" = yes; then dnl Test whether ceilf() can be used without libm. gl_FUNC_CEILF_LIBS if test "$CEILF_LIBM" = "?"; then dnl Sun C 5.0 on Solaris declares ceilf() and has it in the system-wide dnl libm.so, but not in the libm.so that the compiler uses. REPLACE_CEILF=1 fi m4_ifdef([gl_FUNC_CEILF_IEEE], [ if test $gl_ceilf_required = ieee && test $REPLACE_CEILF = 0; then AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether ceilf works according to ISO C 99 with IEC 60559], [gl_cv_func_ceilf_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $CEILF_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> ]gl_FLOAT_MINUS_ZERO_CODE[ ]gl_FLOAT_SIGNBIT_CODE[ static float dummy (float f) { return 0; } int main (int argc, char *argv[]) { float (* volatile my_ceilf) (float) = argc ? ceilf : dummy; int result = 0; /* Test whether ceilf (-0.0f) is -0.0f. */ if (signbitf (minus_zerof) && !signbitf (my_ceilf (minus_zerof))) result |= 1; /* Test whether ceilf (-0.3f) is -0.0f. */ if (signbitf (-0.3f) && !signbitf (my_ceilf (-0.3f))) result |= 2; return result; } ]])], [gl_cv_func_ceilf_ieee=yes], [gl_cv_func_ceilf_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_ceilf_ieee="guessing yes" ;; # Guess yes on native Windows. mingw*) gl_cv_func_ceilf_ieee="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_ceilf_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_ceilf_ieee" in *yes) ;; *) REPLACE_CEILF=1 ;; esac fi ]) else HAVE_DECL_CEILF=0 fi if test $HAVE_DECL_CEILF = 0 || test $REPLACE_CEILF = 1; then dnl No libraries are needed to link lib/ceilf.c. CEILF_LIBM= fi AC_SUBST([CEILF_LIBM]) ]) # Determines the libraries needed to get the ceilf() function. # Sets CEILF_LIBM. AC_DEFUN([gl_FUNC_CEILF_LIBS], [ gl_CACHE_VAL_SILENT([gl_cv_func_ceilf_libm], [ gl_cv_func_ceilf_libm=? AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> float (*funcptr) (float) = ceilf; float x;]], [[x = funcptr(x) + ceilf(x);]])], [gl_cv_func_ceilf_libm=]) if test "$gl_cv_func_ceilf_libm" = "?"; then 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> float (*funcptr) (float) = ceilf; float x;]], [[x = funcptr(x) + ceilf(x);]])], [gl_cv_func_ceilf_libm="-lm"]) LIBS="$save_LIBS" fi ]) CEILF_LIBM="$gl_cv_func_ceilf_libm" ])