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|
# roundl.m4 serial 21
dnl Copyright (C) 2007, 2009-2023 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_ROUNDL],
[
m4_divert_text([DEFAULTS], [gl_roundl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
dnl Persuade glibc <math.h> to declare roundl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
gl_CHECK_MATH_LIB([ROUNDL_LIBM], [x = roundl (x);],
[extern
#ifdef __cplusplus
"C"
#endif
long double roundl (long double);
])
if test "$ROUNDL_LIBM" != missing; then
HAVE_ROUNDL=1
dnl Also check whether it's declared.
dnl IRIX 6.5 has roundl() in libm but doesn't declare it in <math.h>.
AC_CHECK_DECLS([roundl], , [HAVE_DECL_ROUNDL=0], [[#include <math.h>]])
m4_ifdef([gl_FUNC_ROUNDL_IEEE], [
if test $gl_roundl_required = ieee && test $REPLACE_ROUNDL = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether roundl works according to ISO C 99 with IEC 60559],
[gl_cv_func_roundl_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $ROUNDL_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
long double roundl (long double);
]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
]gl_LONG_DOUBLE_SIGNBIT_CODE[
static long double dummy (long double f) { return 0; }
int main (int argc, char *argv[])
{
long double (* volatile my_roundl) (long double) = argc ? roundl : dummy;
int result = 0;
/* Test whether roundl (-0.0L) is -0.0L. */
if (signbitl (minus_zerol) && !signbitl (my_roundl (minus_zerol)))
result |= 1;
/* Test whether roundl (-0.3L) is -0.0L. */
if (signbitl (-0.3L) && !signbitl (my_roundl (-0.3L)))
result |= 2;
return result;
}
]])],
[gl_cv_func_roundl_ieee=yes],
[gl_cv_func_roundl_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_roundl_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_roundl_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_roundl_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_roundl_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_roundl_ieee" in
*yes) ;;
*) REPLACE_ROUNDL=1 ;;
esac
fi
])
else
HAVE_ROUNDL=0
HAVE_DECL_ROUNDL=0
fi
if test $HAVE_ROUNDL = 0 || test $REPLACE_ROUNDL = 1; then
dnl Find libraries needed to link lib/roundl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
AC_REQUIRE([gl_FUNC_ROUND])
ROUNDL_LIBM="$ROUND_LIBM"
else
AC_CHECK_DECLS([ceill, floorl], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_floorl" = yes \
&& test "$ac_cv_have_decl_ceill" = yes; then
gl_FUNC_FLOORL_LIBS
gl_FUNC_CEILL_LIBS
if test "$FLOORL_LIBM" != '?' && test "$CEILL_LIBM" != '?'; then
AC_DEFINE([HAVE_FLOORL_AND_CEILL], [1],
[Define if the both the floorl() and ceill() functions exist.])
ROUNDL_LIBM=
dnl Append $FLOORL_LIBM to ROUNDL_LIBM, avoiding gratuitous duplicates.
case " $ROUNDL_LIBM " in
*" $FLOORL_LIBM "*) ;;
*) ROUNDL_LIBM="$ROUNDL_LIBM $FLOORL_LIBM" ;;
esac
dnl Append $CEILL_LIBM to ROUNDL_LIBM, avoiding gratuitous duplicates.
case " $ROUNDL_LIBM " in
*" $CEILL_LIBM "*) ;;
*) ROUNDL_LIBM="$ROUNDL_LIBM $CEILL_LIBM" ;;
esac
else
ROUNDL_LIBM=
fi
else
ROUNDL_LIBM=
fi
fi
fi
AC_SUBST([ROUNDL_LIBM])
])
|
