# isnan.m4 serial 5 dnl Copyright (C) 2007-2016 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]) ])