math: fix util for fenv without rounding modes

diff --git a/src/math/util.c b/src/math/util.c
index 1892173..1b2ff78 100644 (file)
--- a/src/math/util.c
+++ b/src/math/util.c
@@ -121,9 +121,15 @@ char *rstr(int r)
 {
        switch (r) {
        case RN: return "RN";
+#ifdef FE_TOWARDZERO
        case RZ: return "RZ";
+#endif
+#ifdef FE_UPWARD
        case RU: return "RU";
+#endif
+#ifdef FE_DOWNWARD
        case RD: return "RD";
+#endif
        }
        return "R?";
 }