re PR c/43981 (-Wunused-but-set-variable does not consider array sizing use of a...

	PR c/43981
	* c-parser.c (c_parser_direct_declarator_inner): Call mark_exp_read
	on dimen.

	* gcc.dg/Wunused-var-8.c: New test.

From-SVN: r159044

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 61797432b8d46dd6838a516506ca9835bf78fba3..21f145e9bc2276f2e01999c97b1ef843933dab40 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-05-04  Jakub Jelinek  <jakub@redhat.com>
+
+       PR c/43981
+       * c-parser.c (c_parser_direct_declarator_inner): Call mark_exp_read
+       on dimen.
+
 2010-05-04  H.J. Lu  <hongjiu.lu@intel.com>
 
        PR target/43799

diff --git a/gcc/c-parser.c b/gcc/c-parser.c
index cbdee1eb8a143a644568eb8fd3f5a6532528bf97..e5440d47caf1e459deeef237f9843912db854b81 100644 (file)
--- a/gcc/c-parser.c
+++ b/gcc/c-parser.c
@@ -2474,6 +2474,8 @@ c_parser_direct_declarator_inner (c_parser *parser, bool id_present,
                                     "expected %<]%>");
          return NULL;
        }
+      if (dimen)
+       mark_exp_read (dimen);
       declarator = build_array_declarator (brace_loc, dimen, quals_attrs,
                                           static_seen, star_seen);
       if (declarator == NULL)

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 5b213ca82fdaf263f977709bc29b0bf6314ac395..4b2fe7d57adc3d354f45744e41e132211f6a1b79 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-05-04  Jakub Jelinek  <jakub@redhat.com>
+
+       PR c/43981
+       * gcc.dg/Wunused-var-8.c: New test.
+
 2010-05-04  Jason Merrill  <jason@redhat.com>
 
        PR c++/38064

diff --git a/gcc/testsuite/gcc.dg/Wunused-var-8.c b/gcc/testsuite/gcc.dg/Wunused-var-8.c
new file mode 100644 (file)
index 0000000..1217719
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wunused-var-8.c
@@ -0,0 +1,15 @@
+/* PR c/43981 */
+/* { dg-do compile } */
+/* { dg-options "-Wunused" } */
+
+void g (char *);
+
+char
+f (int a)
+{
+  int len = a * 3;
+  char t[len];
+
+  g (t);
+  return t[0];
+}