1 files changed, 49 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/compare4.c b/gcc/testsuite/gcc.dg/compare4.c
new file mode 100644
index 000000000..e5dad4d1e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/compare4.c
@@ -0,0 +1,49 @@
+/* Test for a bogus warning on comparison between signed and unsigned.
+   Origin: Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 5/13/2001.  */
+
+/* { dg-do compile } */
+/* { dg-options "-fshow-column -Wsign-compare -fstrict-overflow" } */
+
+extern void bar(void);
+
+int foo(int x, int y, unsigned u)
+{
+  /* A COMPOUND_EXPR is non-negative if the last element is known to
+     be non-negative.  */
+  if (u < (bar(), -1)) /*{ dg-warning "9:signed and unsigned" "COMPOUND_EXPR" }*/
+    return x;
+  if (u < (bar(), 10))
+    return x;
+  if ((bar(), 10) < u)
+    return x;
+  if (u < (x ? (bar(),bar(),bar(),bar(),x==y) : 10))
+    return x;
+  if ((x ? 10 : (bar(),bar(),bar(),bar(),x==y)) < u)
+    return x;
+
+  /* Test an ABS_EXPR, which is by definition non-negative when
+     -fstrict-overflow is used.  */
+  if (u < __builtin_abs(x))
+    return x;
+  if (__builtin_abs(x) < u)
+    return x;
+  if (u < (x ? __builtin_abs(x) : 10))
+    return x;
+  if ((x ? 10: __builtin_abs(x)) < u)
+    return x;
+
+  /* A MODIFY_EXPR is non-negative if the new value is known to be
+     non-negative.  */
+  if (u < (x = -1)) /* { dg-warning "9:signed and unsigned" "MODIFY_EXPR" } */
+    return x;
+  if (u < (x = 10))
+    return x;
+  if ((x = 10) < u)
+    return x;
+  if (u < (x = (y ? (x==y) : 10)))
+    return x;
+  if ((x = (y ? 10 : (x==y))) < u)
+    return x;
+
+  return 0;
+}