PR c/21759

        * c.opt (Wc++-compat): New.
        * doc/invoke.texi (-Wc++-compat): Document.
        * c-typeck.c (convert_for_assignment): Check for implicit
        conversion void* -> T*.
testsuite/
        * gcc.dg/Wcxx-compat-1.c: New.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@100806 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 11 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/Wcxx-compat-1.c b/gcc/testsuite/gcc.dg/Wcxx-compat-1.c
new file mode 100644
index 00000000000..91500421e85
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wcxx-compat-1.c
@@ -0,0 +1,11 @@
+/* PR c/21759  */
+/* { dg-options "-Wc++-compat" } */
+
+int
+main(void)
+{
+   void *p = 0;
+   int *q = p;                  /* { dg-warning "not permitted" } */
+   double* t = (void *)0;
+   return p != q;
+}