PR c/11234

	* c-typeck.c (build_c_cast): If pedantic, warn for conversions
	between function and object pointers.
	(digest_init): When comparing a pointer to function type to the
	target type, only apply TREE_TYPE once to the pointer to function
	type.
	* except.c (for_each_eh_label_1): Treat data as a pointer to a
	function pointer rather than casting it to a function pointer.
	(for_each_eh_label): Update caller.
	* recog.h (struct insn_data): Use a struct or union for output.
	* genoutput.c (output_insn_data): Update.
	* final.c (get_insn_template): Update.

testsuite:
	* gcc.dg/func-ptr-conv-1.c: New test.
	* gcc.dg/weak/weak-6.c, gcc.dg/weak/weak-7.c: Update.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@75595 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 56 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/func-ptr-conv-1.c b/gcc/testsuite/gcc.dg/func-ptr-conv-1.c
new file mode 100644
index 00000000000..4e42e5fe117
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/func-ptr-conv-1.c
@@ -0,0 +1,56 @@
+/* Conversions between function and object pointers are not permitted
+   in any version of ISO C, even with casts, except for the special
+   case of converting a null pointer constant to function pointer
+   type.  Likewise, comparisons between function and object pointers
+   are not permitted.  PR c/11234.  */
+/* Origin: Joseph Myers <jsm@polyomino.org.uk> */
+/* { dg-do compile } */
+/* { dg-options "-pedantic" } */
+
+void f(void);
+
+void *v1 = f; /* { dg-warning "pointer" "bad conversion" } */
+void *v2 = &f; /* { dg-warning "pointer" "bad conversion" } */
+void *v3 = (void *)f; /* { dg-warning "pointer" "bad conversion" } */
+void *v4 = (void *)&f; /* { dg-warning "pointer" "bad conversion" } */
+void *v5;
+char *c1 = f; /* { dg-warning "pointer" "bad conversion" } */
+char *c2 = &f; /* { dg-warning "pointer" "bad conversion" } */
+char *c3 = (char *)f; /* { dg-warning "pointer" "bad conversion" } */
+char *c4 = (char *)&f; /* { dg-warning "pointer" "bad conversion" } */
+char *c5;
+void (*fp)(void);
+int a;
+
+void
+g(void)
+{
+  v5 = f; /* { dg-warning "pointer" "bad conversion" } */
+  v5 = &f; /* { dg-warning "pointer" "bad conversion" } */
+  v5 = (void *)f; /* { dg-warning "pointer" "bad conversion" } */
+  v5 = (void *)&f; /* { dg-warning "pointer" "bad conversion" } */
+  c5 = f; /* { dg-warning "pointer" "bad conversion" } */
+  c5 = &f; /* { dg-warning "pointer" "bad conversion" } */
+  c5 = (char *)f; /* { dg-warning "pointer" "bad conversion" } */
+  c5 = (char *)&f; /* { dg-warning "pointer" "bad conversion" } */
+  fp = v5; /* { dg-warning "pointer" "bad conversion" } */
+  fp = c5; /* { dg-warning "pointer" "bad conversion" } */
+  fp = (void (*)(void))v5; /* { dg-warning "pointer" "bad conversion" } */
+  fp = (void (*)(void))c5; /* { dg-warning "pointer" "bad conversion" } */
+  (a ? f : v3); /* { dg-warning "pointer" "bad conversion" } */
+  (a ? v2 : fp); /* { dg-warning "pointer" "bad conversion" } */
+  /* The following are OK.  */
+  fp = 0;
+  fp = (void *)0;
+  fp = 0L;
+  fp = (void (*)(void))0;
+  fp = (void (*)(void))(void *)0;
+  (a ? f : 0);
+  (a ? f : (void *)0);
+  (a ? (void *)0 : fp);
+  (a ? 0 : fp);
+}
+
+/* The following are OK.  */
+void (*fp2)(void) = 0;
+void (*fp3)(void) = (void *)0;