Mercurial > gnulib
view m4/ceill.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
# ceill.m4 serial 18 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_CEILL], [ m4_divert_text([DEFAULTS], [gl_ceill_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles dnl Persuade glibc <math.h> to declare ceill(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether ceill() is declared. AC_CHECK_DECLS([ceill], , , [[#include <math.h>]]) if test "$ac_cv_have_decl_ceill" = yes; then dnl Test whether ceill() can be used without libm. gl_FUNC_CEILL_LIBS if test "$CEILL_LIBM" = "?"; then dnl Sun C 5.0 on Solaris declares ceill() and has it in the system-wide dnl libm.so, but not in the libm.so that the compiler uses. REPLACE_CEILL=1 fi m4_ifdef([gl_FUNC_CEILL_IEEE], [ if test $gl_ceill_required = ieee && test $REPLACE_CEILL = 0; then AC_CACHE_CHECK([whether ceill works according to ISO C 99 with IEC 60559], [gl_cv_func_ceill_ieee], [ save_LIBS="$LIBS" LIBS="$LIBS $CEILL_LIBM" AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> ]gl_LONG_DOUBLE_MINUS_ZERO_CODE[ ]gl_LONG_DOUBLE_SIGNBIT_CODE[ static long double dummy (long double f) { return 0; } int main (int argc, char *argv[]) { long double (* volatile my_ceill) (long double) = argc ? ceill : dummy; /* Test whether ceill (-0.3L) is -0.0L. */ if (signbitl (minus_zerol) && !signbitl (my_ceill (-0.3L))) return 1; return 0; } ]])], [gl_cv_func_ceill_ieee=yes], [gl_cv_func_ceill_ieee=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu* | gnu*) gl_cv_func_ceill_ieee="guessing yes" ;; # Guess yes on native Windows. mingw*) gl_cv_func_ceill_ieee="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_ceill_ieee="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_ceill_ieee" in *yes) ;; *) REPLACE_CEILL=1 ;; esac fi ]) else HAVE_DECL_CEILL=0 fi dnl On OpenBSD5.6 the system's native ceill() is buggy: dnl it returns '0' for small values. Test for this anomaly. if test $REPLACE_CEILL = 0 ; then AC_CACHE_CHECK([whether ceill() breaks with small values], [gl_cv_func_ceill_buggy], [ save_LIBS="$LIBS" LIBS="$CEILL_LIBM" AC_RUN_IFELSE( [AC_LANG_PROGRAM( [[#include <math.h> long double d = 0.3L;]], [[return (!(ceill (d) == 1)); ]])], [gl_cv_func_ceill_buggy=no], [gl_cv_func_ceill_buggy=yes], [case "$host_os" in openbsd*) gl_cv_func_ceill_buggy="guessing yes" ;; # Guess no on native Windows. mingw*) gl_cv_func_ceill_buggy="guessing no" ;; *) gl_cv_func_ceill_buggy="guessing no" ;; esac ]) LIBS="$save_LIBS" ]) case "$gl_cv_func_ceill_buggy" in *yes) REPLACE_CEILL=1 ;; esac fi if test $HAVE_DECL_CEILL = 0 || test $REPLACE_CEILL = 1; then dnl Find libraries needed to link lib/ceill.c. if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then AC_REQUIRE([gl_FUNC_CEIL]) CEILL_LIBM="$CEIL_LIBM" else CEILL_LIBM= fi fi AC_SUBST([CEILL_LIBM]) ]) # Determines the libraries needed to get the ceill() function. # Sets CEILL_LIBM. AC_DEFUN([gl_FUNC_CEILL_LIBS], [ gl_CACHE_VAL_SILENT([gl_cv_func_ceill_libm], [ gl_cv_func_ceill_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) = ceill; long double x;]], [[x = funcptr(x) + ceill(x);]])], [gl_cv_func_ceill_libm=]) if test "$gl_cv_func_ceill_libm" = "?"; then save_LIBS="$LIBS" LIBS="$LIBS -lm" AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> long double (*funcptr) (long double) = ceill; long double x;]], [[x = funcptr(x) + ceill(x);]])], [gl_cv_func_ceill_libm="-lm"]) LIBS="$save_LIBS" fi ]) CEILL_LIBM="$gl_cv_func_ceill_libm" ])