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|
# exp2l.m4 serial 11
dnl Copyright (C) 2010-2023 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_EXP2L],
[
m4_divert_text([DEFAULTS], [gl_exp2l_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_EXP2])
dnl Persuade glibc <math.h> to declare exp2l().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether exp2l() exists. Assume that exp2l(), if it exists, is
dnl defined in the same library as exp2().
save_LIBS="$LIBS"
LIBS="$LIBS $EXP2_LIBM"
AC_CHECK_FUNCS([exp2l])
LIBS="$save_LIBS"
if test $ac_cv_func_exp2l = yes; then
HAVE_EXP2L=1
EXP2L_LIBM="$EXP2_LIBM"
dnl Also check whether it's declared.
dnl IRIX 6.5 has exp2l() in libm but doesn't declare it in <math.h>.
AC_CHECK_DECL([exp2l], , [HAVE_DECL_EXP2L=0], [[#include <math.h>]])
if test $REPLACE_EXP2L = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether exp2l works],
[gl_cv_func_exp2l_works],
[
save_LIBS="$LIBS"
LIBS="$LIBS $EXP2L_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <float.h>
#include <math.h>
/* Override the values of <float.h>, like done in float.in.h. */
#if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 64
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP (-16381)
# undef LDBL_MAX_EXP
# define LDBL_MAX_EXP 16384
#endif
#if defined __i386__ && (defined __FreeBSD__ || defined __DragonFly__)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 64
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP (-16381)
# undef LDBL_MAX_EXP
# define LDBL_MAX_EXP 16384
#endif
#if (defined _ARCH_PPC || defined _POWER) && defined _AIX && (LDBL_MANT_DIG == 106) && defined __GNUC__
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP DBL_MIN_EXP
#endif
#if defined __sgi && (LDBL_MANT_DIG >= 106)
# undef LDBL_MANT_DIG
# define LDBL_MANT_DIG 106
# if defined __GNUC__
# undef LDBL_MIN_EXP
# define LDBL_MIN_EXP DBL_MIN_EXP
# endif
#endif
#undef exp2l
extern
#ifdef __cplusplus
"C"
#endif
long double exp2l (long double);
static long double dummy (long double x) { return 0; }
int main (int argc, char *argv[])
{
long double (* volatile my_exp2l) (long double) = argc ? exp2l : dummy;
int result = 0;
/* This test fails on NetBSD 9.0. */
{
const long double TWO_LDBL_MANT_DIG = /* 2^LDBL_MANT_DIG */
(long double) (1U << ((LDBL_MANT_DIG - 1) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 1) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 2) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 3) / 5))
* (long double) (1U << ((LDBL_MANT_DIG - 1 + 4) / 5));
long double x = 11.358L;
long double err = (my_exp2l (x) * my_exp2l (- x) - 1.0L) * TWO_LDBL_MANT_DIG;
if (!(err >= -100.0L && err <= 100.0L))
result |= 1;
}
return result;
}
]])],
[gl_cv_func_exp2l_works=yes],
[gl_cv_func_exp2l_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_exp2l_works="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_exp2l_works="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_exp2l_works="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_exp2l_works="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_exp2l_works" in
*yes) ;;
*) REPLACE_EXP2L=1 ;;
esac
fi
m4_ifdef([gl_FUNC_EXP2L_IEEE], [
if test $gl_exp2l_required = ieee && test $REPLACE_EXP2L = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether exp2l works according to ISO C 99 with IEC 60559],
[gl_cv_func_exp2l_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $EXP2L_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
#undef exp2l
extern
#ifdef __cplusplus
"C"
#endif
long double exp2l (long double);
static long double dummy (long double x) { return 0; }
static long double zero;
int main (int argc, char *argv[])
{
long double (* volatile my_exp2l) (long double) = argc ? exp2l : dummy;
int result = 0;
/* This test fails on OpenBSD 4.9, where exp2l(NaN) = 0.0. */
if (exp2l (zero / zero) == 0.0L)
result |= 1;
/* This test fails on IRIX 6.5, where exp2l(-Inf) = 1.0. */
if (!(exp2l (-1.0L / zero) == 0.0L))
result |= 2;
return result;
}
]])],
[gl_cv_func_exp2l_ieee=yes],
[gl_cv_func_exp2l_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_exp2l_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_exp2l_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_exp2l_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_exp2l_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_exp2l_ieee" in
*yes) ;;
*) REPLACE_EXP2L=1 ;;
esac
fi
])
else
HAVE_EXP2L=0
HAVE_DECL_EXP2L=0
fi
if test $HAVE_EXP2L = 0 || test $REPLACE_EXP2L = 1; then
dnl Find libraries needed to link lib/exp2l.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
EXP2L_LIBM="$EXP2_LIBM"
else
AC_REQUIRE([gl_FUNC_ISNANL])
AC_REQUIRE([gl_FUNC_ROUNDL])
AC_REQUIRE([gl_FUNC_LDEXPL])
EXP2L_LIBM=
dnl Append $ISNANL_LIBM to EXP2L_LIBM, avoiding gratuitous duplicates.
case " $EXP2L_LIBM " in
*" $ISNANL_LIBM "*) ;;
*) EXP2L_LIBM="$EXP2L_LIBM $ISNANL_LIBM" ;;
esac
dnl Append $ROUNDL_LIBM to EXP2L_LIBM, avoiding gratuitous duplicates.
case " $EXP2L_LIBM " in
*" $ROUNDL_LIBM "*) ;;
*) EXP2L_LIBM="$EXP2L_LIBM $ROUNDL_LIBM" ;;
esac
dnl Append $LDEXPL_LIBM to EXP2L_LIBM, avoiding gratuitous duplicates.
case " $EXP2L_LIBM " in
*" $LDEXPL_LIBM "*) ;;
*) EXP2L_LIBM="$EXP2L_LIBM $LDEXPL_LIBM" ;;
esac
fi
fi
AC_SUBST([EXP2L_LIBM])
])
|
