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# isnan.m4 serial 5
dnl Copyright (C) 2007-2021 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_ISNAN],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_ISNANF])
AC_REQUIRE([gl_FUNC_ISNAND])
AC_REQUIRE([gl_FUNC_ISNANL])
# If we replaced any of the underlying isnan* functions, replace
# the isnan macro; it undoubtedly suffers from the same flaws.
AC_MSG_CHECKING([whether isnan macro works])
if test $gl_func_isnanf = yes \
&& test $gl_func_isnand = yes \
&& test $gl_func_isnanl = yes; then
AC_MSG_RESULT([yes])
ISNAN_LIBM=
dnl Append $ISNANF_LIBM to ISNAN_LIBM, avoiding gratuitous duplicates.
case " $ISNAN_LIBM " in
*" $ISNANF_LIBM "*) ;;
*) ISNAN_LIBM="$ISNAN_LIBM $ISNANF_LIBM" ;;
esac
dnl Append $ISNAND_LIBM to ISNAN_LIBM, avoiding gratuitous duplicates.
case " $ISNAN_LIBM " in
*" $ISNAND_LIBM "*) ;;
*) ISNAN_LIBM="$ISNAN_LIBM $ISNAND_LIBM" ;;
esac
dnl Append $ISNANL_LIBM to ISNAN_LIBM, avoiding gratuitous duplicates.
case " $ISNAN_LIBM " in
*" $ISNANL_LIBM "*) ;;
*) ISNAN_LIBM="$ISNAN_LIBM $ISNANL_LIBM" ;;
esac
else
AC_MSG_RESULT([no])
dnl REPLACE_ISNAN=1 also makes sure the rpl_isnan[fdl] functions get built.
REPLACE_ISNAN=1
ISNAN_LIBM=
fi
AC_SUBST([ISNAN_LIBM])
])
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