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|
# remainderl.m4 serial 14
dnl Copyright (C) 2012-2023 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_REMAINDERL],
[
m4_divert_text([DEFAULTS], [gl_remainderl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_REMAINDER])
dnl Persuade glibc <math.h> to declare remainderl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether remainderl() exists. Assume that remainderl(), if it exists, is
dnl defined in the same library as remainder().
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDER_LIBM"
AC_CACHE_CHECK([for remainderl],
[gl_cv_func_remainderl],
[
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
long double remainderl (long double, long double);
long double (*funcptr) (long double, long double) = remainderl;
long double x;
long double y;]],
[[return funcptr (x, y) > 1
|| remainderl (x, y) > 1;]])],
[gl_cv_func_remainderl=yes],
[gl_cv_func_remainderl=no])
])
LIBS="$save_LIBS"
if test $gl_cv_func_remainderl = yes; then
HAVE_REMAINDERL=1
REMAINDERL_LIBM="$REMAINDER_LIBM"
dnl Also check whether it's declared.
dnl IRIX 6.5 has remainderl() in libm but doesn't declare it in <math.h>.
AC_CHECK_DECLS([remainderl], , [HAVE_DECL_REMAINDERL=0], [[#include <math.h>]])
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDERL_LIBM"
gl_FUNC_REMAINDERL_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_remainderl_works" in
*yes) ;;
*) REPLACE_REMAINDERL=1 ;;
esac
m4_ifdef([gl_FUNC_REMAINDERL_IEEE], [
if test $gl_remainderl_required = ieee && test $REPLACE_REMAINDERL = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether remainderl works according to ISO C 99 with IEC 60559],
[gl_cv_func_remainderl_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $REMAINDERL_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
extern
#ifdef __cplusplus
"C"
#endif
long double remainderl (long double, long double);
/* Compare two numbers with ==.
This is a separate function because IRIX 6.5 "cc -O" miscompiles an
'x == x' test. */
static int
numeric_equal (long double x, long double y)
{
return x == y;
}
static long double dummy (long double x, long double y) { return 0; }
int main (int argc, char *argv[])
{
long double (* volatile my_remainderl) (long double, long double) = argc ? remainderl : dummy;
long double f;
/* Test remainderl(...,0.0L).
This test fails on OSF/1 5.1. */
f = my_remainderl (2.0L, 0.0L);
if (numeric_equal (f, f))
return 1;
return 0;
}
]])],
[gl_cv_func_remainderl_ieee=yes],
[gl_cv_func_remainderl_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_remainderl_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_remainderl_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_remainderl_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_remainderl_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_remainderl_ieee" in
*yes) ;;
*) REPLACE_REMAINDERL=1 ;;
esac
fi
])
else
HAVE_REMAINDERL=0
HAVE_DECL_REMAINDERL=0
fi
if test $HAVE_REMAINDERL = 0 || test $REPLACE_REMAINDERL = 1; then
dnl Find libraries needed to link lib/remainderl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
REMAINDERL_LIBM="$REMAINDER_LIBM"
else
AC_REQUIRE([gl_FUNC_FABSL])
AC_REQUIRE([gl_FUNC_FMODL])
AC_REQUIRE([gl_FUNC_ISNANL])
REMAINDERL_LIBM=
dnl Append $FABSL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERL_LIBM " in
*" $FABSL_LIBM "*) ;;
*) REMAINDERL_LIBM="$REMAINDERL_LIBM $FABSL_LIBM" ;;
esac
dnl Append $FMODL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERL_LIBM " in
*" $FMODL_LIBM "*) ;;
*) REMAINDERL_LIBM="$REMAINDERL_LIBM $FMODL_LIBM" ;;
esac
dnl Append $ISNANL_LIBM to REMAINDERL_LIBM, avoiding gratuitous duplicates.
case " $REMAINDERL_LIBM " in
*" $ISNANL_LIBM "*) ;;
*) REMAINDERL_LIBM="$REMAINDERL_LIBM $ISNANL_LIBM" ;;
esac
fi
fi
AC_SUBST([REMAINDERL_LIBM])
])
dnl Test whether remainderl() works.
dnl It produces completely wrong values on OpenBSD 5.1/SPARC.
dnl On musl 1.2.2/{arm64,s390x}, the result is accurate to only 16 digits.
AC_DEFUN([gl_FUNC_REMAINDERL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether remainderl works], [gl_cv_func_remainderl_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <float.h>
#include <math.h>
/* Override the values of <float.h>, like done in float.in.h. */
#if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 64
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP (-16381)
# undef LDBL_MAX_EXP
# define LDBL_MAX_EXP 16384
#endif
#if defined __i386__ && (defined __FreeBSD__ || defined __DragonFly__)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 64
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP (-16381)
# undef LDBL_MAX_EXP
# define LDBL_MAX_EXP 16384
#endif
#if (defined _ARCH_PPC || defined _POWER) && defined _AIX && (LDBL_MANT_DIG == 106) && defined __GNUC__
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP DBL_MIN_EXP
#endif
#if defined __sgi && (LDBL_MANT_DIG >= 106)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 106
# if defined __GNUC__
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP DBL_MIN_EXP
# endif
#endif
extern
#ifdef __cplusplus
"C"
#endif
long double remainderl (long double, long double);
static long double dummy (long double x, long double y) { return 0; }
volatile long double gx;
volatile long double gy;
long double gz;
int main (int argc, char *argv[])
{
long double (* volatile my_remainderl) (long double, long double) =
argc ? remainderl : dummy;
int result = 0;
/* This test fails on OpenBSD 5.1/SPARC. */
{
gx = 9.245907126L;
gy = 3.141592654L;
gz = remainderl (gx, gy);
if (gz >= 0.0L)
result |= 1;
}
/* This test fails on musl 1.2.2/arm64, musl 1.2.2/s390x. */
{
const long double TWO_LDBL_MANT_DIG = /* 2^LDBL_MANT_DIG */
(long double) (1U << ((LDBL_MANT_DIG - 1) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 1) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 2) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 3) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 4) / 5));
long double x = 11.357996098166760874793827872740874983168L;
long double y = 0.486497838502717923110029188864352615388L;
long double z = my_remainderl (x, y) - (x - 23 * y);
long double err = z * TWO_LDBL_MANT_DIG;
if (!(err >= -32.0L && err <= 32.0L))
result |= 2;
}
return result;
}
]])],
[gl_cv_func_remainderl_works=yes],
[gl_cv_func_remainderl_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_remainderl_works="guessing yes" ;;
# Guess no on musl systems.
*-musl* | midipix*) gl_cv_func_remainderl_works="guessing no" ;;
# Guess no on OpenBSD.
openbsd*) gl_cv_func_remainderl_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_remainderl_works="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_remainderl_works="$gl_cross_guess_normal" ;;
esac
])
])
])
|
