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|
# log1pl.m4 serial 10
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_LOG1PL],
[
m4_divert_text([DEFAULTS], [gl_log1pl_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([gl_FUNC_LOG1P])
dnl Persuade glibc <math.h> to declare log1pl().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether log1pl() exists. Assume that log1pl(), if it exists, is
dnl defined in the same library as log1p().
save_LIBS="$LIBS"
LIBS="$LIBS $LOG1P_LIBM"
AC_CHECK_FUNCS([log1pl])
LIBS="$save_LIBS"
if test $ac_cv_func_log1pl = yes; then
LOG1PL_LIBM="$LOG1P_LIBM"
save_LIBS="$LIBS"
LIBS="$LIBS $LOG1PL_LIBM"
gl_FUNC_LOG1PL_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_log1pl_works" in
*yes) ;;
*) REPLACE_LOG1PL=1 ;;
esac
m4_ifdef([gl_FUNC_LOG1PL_IEEE], [
if test $gl_log1pl_required = ieee && test $REPLACE_LOG1PL = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether log1pl works according to ISO C 99 with IEC 60559],
[gl_cv_func_log1pl_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $LOG1PL_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
]gl_LONG_DOUBLE_SIGNBIT_CODE[
static long double dummy (long double x) { return 0; }
int main (int argc, char *argv[])
{
long double (* volatile my_log1pl) (long double) = argc ? log1pl : dummy;
/* This test fails on AIX 7.1, IRIX 6.5. */
long double y = my_log1pl (minus_zerol);
if (!(y == 0.0L) || (signbitl (minus_zerol) && !signbitl (y)))
return 1;
return 0;
}
]])],
[gl_cv_func_log1pl_ieee=yes],
[gl_cv_func_log1pl_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_log1pl_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_log1pl_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_log1pl_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_log1pl_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_log1pl_ieee" in
*yes) ;;
*) REPLACE_LOG1PL=1 ;;
esac
fi
])
else
HAVE_LOG1PL=0
dnl Find libraries needed to link lib/log1pl.c.
if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
LOG1PL_LIBM="$LOG1P_LIBM"
else
AC_REQUIRE([gl_FUNC_ISNANL])
AC_REQUIRE([gl_FUNC_LOGL])
AC_REQUIRE([gl_FUNC_ROUNDL])
LOG1PL_LIBM=
dnl Append $ISNANL_LIBM to LOG1PL_LIBM, avoiding gratuitous duplicates.
case " $LOG1PL_LIBM " in
*" $ISNANL_LIBM "*) ;;
*) LOG1PL_LIBM="$LOG1PL_LIBM $ISNANL_LIBM" ;;
esac
dnl Append $LOGL_LIBM to LOG1PL_LIBM, avoiding gratuitous duplicates.
case " $LOG1PL_LIBM " in
*" $LOGL_LIBM "*) ;;
*) LOG1PL_LIBM="$LOG1PL_LIBM $LOGL_LIBM" ;;
esac
dnl Append $ROUNDL_LIBM to LOG1PL_LIBM, avoiding gratuitous duplicates.
case " $LOG1PL_LIBM " in
*" $ROUNDL_LIBM "*) ;;
*) LOG1PL_LIBM="$LOG1PL_LIBM $ROUNDL_LIBM" ;;
esac
fi
fi
AC_SUBST([LOG1PL_LIBM])
])
dnl Test whether log1pl() works.
dnl On musl 1.2.2/{arm64,s390x}, the result is accurate to only 16 digits.
AC_DEFUN([gl_FUNC_LOG1PL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether log1pl works], [gl_cv_func_log1pl_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
#undef log1pl
extern
#ifdef __cplusplus
"C"
#endif
long double log1pl (long double);
static long double dummy (long double x) { return 0; }
int main (int argc, char *argv[])
{
long double (* volatile my_log1pl) (long double) = argc ? log1pl : dummy;
int result = 0;
/* 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 = 11.358L;
long double y = my_log1pl (x);
long double z = my_log1pl (- x / (1.0L + x));
long double err = (y + z) * TWO_LDBL_MANT_DIG;
if (!(err >= -900.0L && err <= 900.0L))
result |= 1;
}
return result;
}
]])],
[gl_cv_func_log1pl_works=yes],
[gl_cv_func_log1pl_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_log1pl_works="guessing yes" ;;
# Guess no on musl systems.
*-musl* | midipix*) gl_cv_func_log1pl_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_log1pl_works="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_log1pl_works="$gl_cross_guess_normal" ;;
esac
])
])
])
|
