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# log1p.m4 serial 9
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_LOG1P],
[
m4_divert_text([DEFAULTS], [gl_log1p_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
dnl Persuade glibc <math.h> to declare log1p().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Determine LOG1P_LIBM.
gl_COMMON_DOUBLE_MATHFUNC([log1p])
dnl Test whether log1p() exists.
save_LIBS="$LIBS"
LIBS="$LIBS $LOG1P_LIBM"
AC_CHECK_FUNCS([log1p])
LIBS="$save_LIBS"
if test $ac_cv_func_log1p = yes; then
:
m4_ifdef([gl_FUNC_LOG1P_IEEE], [
if test $gl_log1p_required = ieee && test $REPLACE_LOG1P = 0; then
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether log1p works according to ISO C 99 with IEC 60559],
[gl_cv_func_log1p_ieee],
[
save_LIBS="$LIBS"
LIBS="$LIBS $LOG1P_LIBM"
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#ifndef __NO_MATH_INLINES
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
]gl_DOUBLE_MINUS_ZERO_CODE[
]gl_DOUBLE_SIGNBIT_CODE[
static double dummy (double x) { return 0; }
int main (int argc, char *argv[])
{
double (* volatile my_log1p) (double) = argc ? log1p : dummy;
/* This test fails on AIX, HP-UX 11. */
double y = my_log1p (minus_zerod);
if (!(y == 0.0) || (signbitd (minus_zerod) && !signbitd (y)))
return 1;
return 0;
}
]])],
[gl_cv_func_log1p_ieee=yes],
[gl_cv_func_log1p_ieee=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_log1p_ieee="guessing yes" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_log1p_ieee="guessing yes" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_log1p_ieee="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_log1p_ieee="$gl_cross_guess_normal" ;;
esac
])
LIBS="$save_LIBS"
])
case "$gl_cv_func_log1p_ieee" in
*yes) ;;
*) REPLACE_LOG1P=1 ;;
esac
fi
])
else
HAVE_LOG1P=0
fi
if test $HAVE_LOG1P = 0 || test $REPLACE_LOG1P = 1; then
dnl Find libraries needed to link lib/log1p.c.
AC_REQUIRE([gl_FUNC_ISNAND])
AC_REQUIRE([gl_FUNC_LOG])
AC_REQUIRE([gl_FUNC_ROUND])
LOG1P_LIBM=
dnl Append $ISNAND_LIBM to LOG1P_LIBM, avoiding gratuitous duplicates.
case " $LOG1P_LIBM " in
*" $ISNAND_LIBM "*) ;;
*) LOG1P_LIBM="$LOG1P_LIBM $ISNAND_LIBM" ;;
esac
dnl Append $LOG_LIBM to LOG1P_LIBM, avoiding gratuitous duplicates.
case " $LOG1P_LIBM " in
*" $LOG_LIBM "*) ;;
*) LOG1P_LIBM="$LOG1P_LIBM $LOG_LIBM" ;;
esac
dnl Append $ROUND_LIBM to LOG1P_LIBM, avoiding gratuitous duplicates.
case " $LOG1P_LIBM " in
*" $ROUND_LIBM "*) ;;
*) LOG1P_LIBM="$LOG1P_LIBM $ROUND_LIBM" ;;
esac
fi
])
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