eval: Check that RLIM_SAVED_{CUR,MAX} are defined before using them

Apparently they're missing on Debian kfreebsd:
https://buildd.debian.org/status/fetch.php?pkg=bfs&arch=kfreebsd-amd64&ver=2.3-1&stamp=1638379495&raw=0

1 files changed, 24 insertions, 3 deletions

diff --git a/eval.c b/eval.c
index b35a236..ec2701b 100644
--- a/eval.c
+++ b/eval.c
@@ -1416,11 +1416,32 @@ done:
 	return state.action;
 }
 
+/** Check if an rlimit value is infinite. */
+static bool rlim_isinf(rlim_t r) {
+	// Consider RLIM_{INFINITY,SAVED_{CUR,MAX}} all equally infinite
+	if (r == RLIM_INFINITY) {
+		return true;
+	}
+
+#ifdef RLIM_SAVED_CUR
+	if (r == RLIM_SAVED_CUR) {
+		return true;
+	}
+#endif
+
+#ifdef RLIM_SAVED_MAX
+	if (r == RLIM_SAVED_MAX) {
+		return true;
+	}
+#endif
+
+	return false;
+}
+
 /** Compare two rlimit values, accounting for RLIM_INFINITY etc. */
 static int rlim_cmp(rlim_t a, rlim_t b) {
-	// Consider RLIM_{INFINITY,SAVED_{CUR,MAX}} all equally infinite
-	bool a_inf = a == RLIM_INFINITY || a == RLIM_SAVED_CUR || a == RLIM_SAVED_MAX;
-	bool b_inf = b == RLIM_INFINITY || b == RLIM_SAVED_CUR || b == RLIM_SAVED_MAX;
+	bool a_inf = rlim_isinf(a);
+	bool b_inf = rlim_isinf(b);
 	if (a_inf || b_inf) {
 		return a_inf - b_inf;
 	}