2 files changed, 25 insertions, 1 deletions
diff --git a/gcc/testsuite/gcc.dg/analyzer/errno-1.c b/gcc/testsuite/gcc.dg/analyzer/errno-1.c
new file mode 100644
index 0000000..6b9d28c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/analyzer/errno-1.c
@@ -0,0 +1,23 @@
+#include <errno.h>
+#include "analyzer-decls.h"
+
+extern void external_fn (void);
+
+int test_reading_errno (void)
+{
+  return errno;
+}
+
+void test_setting_errno (int val)
+{
+  errno = val;
+}
+
+void test_storing_to_errno (int val)
+{
+  __analyzer_eval (errno == val); /* { dg-warning "UNKNOWN" } */
+  errno = val;
+  __analyzer_eval (errno == val); /* { dg-warning "TRUE" } */
+  external_fn ();
+  __analyzer_eval (errno == val); /* { dg-warning "UNKNOWN" } */  
+}
diff --git a/gcc/testsuite/gcc.dg/analyzer/strchr-1.c b/gcc/testsuite/gcc.dg/analyzer/strchr-1.c
index dfe1bc9..bfa4891 100644
--- a/gcc/testsuite/gcc.dg/analyzer/strchr-1.c
+++ b/gcc/testsuite/gcc.dg/analyzer/strchr-1.c
@@ -3,12 +3,13 @@
 
 const char* test_literal (int x)
 {
-  char *p = __builtin_strchr ("123", x);
+  char *p = __builtin_strchr ("123", x); /* { dg-message "when '__builtin_strchr' returns non-NULL" } */
   if (p)
     {
       __analyzer_eval (*p == x); /* { dg-message "UNKNOWN" } */
       /* TODO: this ought to be TRUE, but it's unclear that it's
 	 worth stashing this constraint.  */
+      *p = 'A'; /* { dg-warning "write to string literal" } */
     }
   return p;
 }