PR middle-end/79221 - missing -Wstringop-overflow= on a strcat overflow

gcc/testsuite/ChangeLog:
	* gcc.dg/Wstringop-overflow-26.c: New test.

From-SVN: r279227

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 25a13a3dd97ff82f8b4d524ac6eb6329d952bf3a..0942db0dc013b1dd810d2588ecde5fa02156f98d 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-12-11  Martin Sebor  <msebor@redhat.com>
+
+       PR middle-end/79221
+       * gcc.dg/Wstringop-overflow-26.c: New test.
+
 2019-12-11  Andre Vieira  <andre.simoesdiasvieira@arm.com>
 
        * gcc.dg/vect/vect-epilogues.c: Remove xfail for arm.

diff --git a/gcc/testsuite/gcc.dg/Wstringop-overflow-26.c b/gcc/testsuite/gcc.dg/Wstringop-overflow-26.c
new file mode 100644 (file)
index 0000000..4e8765e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wstringop-overflow-26.c
@@ -0,0 +1,20 @@
+/* PR middle-end/79221 - missing -Wstringop-overflow= on a strcat overflow
+   { dg-do compile }
+   { dg-options "-O2 -Wall" } */
+
+extern char* strcat (char*, const char*);
+
+char d[3];
+
+void f (int i)
+{
+  const char *s = i < 0 ? "01234567" : "89abcd";
+  strcat (d, s);    // { dg-warning "'strcat' writing between 7 and 9 bytes into a region of size 3" } */
+}
+
+
+void g (int i)
+{
+  const char *s = i < 0 ? "12345678" : "87654321";
+  strcat (d, s);    // { dg-warning "\\\[-Warray-bounds|-Wstringop-overflow" }
+}