* c-common.c (c_expand_expr_stmt): Apply default conversions to

	non-lvalue arrays if C99.
	* c-typeck.c (default_conversion): Split out code handling
	array-to-pointer and function-to-pointer conversions into a
	separate default_function_array_conversion function.
	(default_function_array_conversion): New function.  Keep track of
	whether any NON_LVALUE_EXPRs were stripped.  Return non-lvalue
	arrays unchanged outside C99 mode instead of giving an error for
	them.
	(build_component_ref): Use pedantic_non_lvalue when handling
	COMPOUND_EXPR.  Don't handle COND_EXPR specially.
	(convert_arguments): Use default_function_array_conversion.
	(build_unary_op): For ADDR_EXPR, take a flag indicating whether
	non-lvalues are OK.
	(unary_complex_lvalue): Likewise.
	(internal_build_compound_expr): Use
	default_function_array_conversion.  Apply default conversions to
	function in compound expression.
	(build_c_cast, build_modify_expr, digest_init, build_asm_stmt):
	Use default_function_array_conversion.
	* doc/extend.texi: Update documentation of subscripting non-lvalue
	arrays.
	Fixes PR c/461.

testsuite:
	* gcc.dg/c90-array-lval-1.c, gcc.dg/c90-array-lval-2.c,
	gcc.dg/c99-array-lval-1.c, gcc.dg/c99-array-lval-2.c: Remove
	XFAILs.  Adjust expected error texts.
	* gcc.c-torture/compile/20011106-1.c,
	gcc.c-torture/compile/20011106-2.c, gcc.dg/c90-array-lval-3.c,
	gcc.dg/c90-array-lval-4.c, gcc.dg/c90-array-lval-5.c,
	gcc.dg/c99-array-lval-3.c, gcc.dg/c99-array-lval-4.c,
	gcc.dg/c99-array-lval-5.c: New tests.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@46805 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 26 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/c90-array-lval-4.c b/gcc/testsuite/gcc.dg/c90-array-lval-4.c
new file mode 100644
index 00000000000..1f9cb1455ea
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/c90-array-lval-4.c
@@ -0,0 +1,26 @@
+/* Test for non-lvalue arrays decaying to pointers: in C99 only.
+   Test various ways of producing non-lvalue arrays.  */
+/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1990 -pedantic-errors" } */
+
+struct s { char c[17]; };
+
+struct s x;
+
+struct s a, b, c;
+int d;
+
+#define ASSERT(v, a)	char v[((a) ? 1 : -1)]
+
+ASSERT (p, sizeof (x.c) == 17);
+ASSERT (q, sizeof (0, x.c) == sizeof (char *));
+ASSERT (r0, sizeof ((d ? b : c).c) == 17);
+ASSERT (r1, sizeof ((d, b).c) == 17);
+ASSERT (r2, sizeof ((a = b).c) == 17);
+/* The non-lvalue array does not decay to a pointer, so the comma expression
+   has (non-lvalue) array type.
+*/
+ASSERT (s0, sizeof (0, (d ? b : c).c) == 17); /* { dg-bogus "array" "bad non-lvalue array handling" } */
+ASSERT (s0, sizeof (0, (d, b).c) == 17); /* { dg-bogus "array" "bad non-lvalue array handling" } */
+ASSERT (s0, sizeof (0, (a = b).c) == 17); /* { dg-bogus "array" "bad non-lvalue array handling" } */