obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 31 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/Wunused-value-1.c b/gcc/testsuite/gcc.dg/Wunused-value-1.c
new file mode 100644
index 000000000..0fc7c364b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wunused-value-1.c
@@ -0,0 +1,31 @@
+/* Test -Wunused-value.  Bug 23113.  */
+/* Origin: Joseph Myers <joseph@codesourcery.com> */
+/* { dg-do compile } */
+/* { dg-options "-Wunused-value" } */
+
+int f (void);
+void g (void);
+int *p;
+
+void
+h (void)
+{
+  1 + f (); /* { dg-warning "value computed is not used" } */
+  f () + f (); /* { dg-warning "value computed is not used" } */
+  f () + f (), f (); /* { dg-warning "value computed is not used" } */
+  (char) f (); /* { dg-warning "value computed is not used" } */
+  g ();
+  f ();
+  (void) f ();
+  *p++; /* { dg-warning "value computed is not used" } */
+  ++*p;
+  (*p ? f() : 0);
+  ({ f(); });
+  /* Statement expressions may be used in macro expansions which like
+     functions return values which may or may not be of use, so don't
+     warn for them but do warn inside them.  */
+  ({ f() + 1; });
+  ({ f(); 0; });
+  ({ f() + 1; 0; }); /* { dg-warning "value computed is not used" } */
+  1 + ({ f(); }); /* { dg-warning "value computed is not used" } */
+}