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# log1pl.m4 serial 8
dnl Copyright (C) 2012-2019 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"
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*) 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])
])
|
