PR c/81544 - attribute noreturn and warn_unused_result on the same function accepted

PR c/81544 - attribute noreturn and warn_unused_result on the same function accepted
PR c/81566 - invalid attribute aligned accepted on functions

gcc/ada/ChangeLog:

	PR c/81544
	* gcc-interface/utils.c (gnat_internal_attribute_table): Initialize
	new member of struct attribute_spec.

gcc/c/ChangeLog:

	PR c/81544
	* c-decl.c (c_decl_attributes): Look up existing declaration and
	pass it to decl_attributes.

gcc/c-family/ChangeLog:

	PR c/81544
	PR c/81566
	* c-attribs.c (attr_aligned_exclusions): New array.
	(attr_alloc_exclusions, attr_cold_hot_exclusions): Same.
	(attr_common_exclusions, attr_const_pure_exclusions): Same.
	(attr_gnu_inline_exclusions, attr_inline_exclusions): Same.
	(attr_noreturn_exclusions, attr_returns_twice_exclusions): Same.
	(attr_warn_unused_result_exclusions): Same.
	(handle_hot_attribute, handle_cold_attribute): Simplify.
	(handle_const_attribute): Warn on function returning void.
	(handle_pure_attribute): Same.
	(handle_aligned_attribute): Diagnose conflicting attribute
	specifications.
	* c-warn.c (diagnose_mismatched_attributes): Simplify.

gcc/cp/ChangeLog:

	PR c/81544
	* cp-tree.h (decls_match): Add default argument.
	* decl.c (decls_match): Avoid calling into the target back end
	and triggering an error.
	* decl2.c (cplus_decl_attributes): Look up existing declaration and
	pass it to decl_attributes.
	* tree.c (cxx_attribute_table): Initialize new member of struct
	attribute_spec.

gcc/fortran/ChangeLog:

	PR c/81544
	* f95-lang.c (gfc_attribute_table): Initialize new member of struct
	attribute_spec.

gcc/lto/ChangeLog:

	PR c/81544
	* lto-lang.c (lto_attribute_table): Initialize new member of struct
	attribute_spec.

gcc/ChangeLog:

	PR c/81544
	* attribs.c (empty_attribute_table): Initialize new member of
	struct attribute_spec.
	(decl_attributes): Add argument.  Handle mutually exclusive
	combinations of attributes.
	(selftests::test_attribute_exclusions): New function.
	(selftests::attribute_c_tests): Ditto.
	* attribs.h (decl_attributes): Add default argument.
	* selftest.h (attribute_c_tests): Declare.
	* selftest-run-tests.c (selftest::run_tests): Call attribute_c_tests.
	* tree-core.h (attribute_spec::exclusions, exclude): New type and
	member.
	* doc/extend.texi (Common Function Attributes): Update const and pure.

gcc/testsuite/ChangeLog:

	PR c/81544
	* c-c++-common/Wattributes-2.c: New test.
	* c-c++-common/Wattributes.c: New test.
	* c-c++-common/attributes-3.c: Adjust.
	* gcc.dg/Wattributes-6.c: New test.
	* gcc.dg/Wattributes-7.c: New test.
	* gcc.dg/attr-noinline.c
	* gcc.dg/pr44964.c: Same.
	* gcc.dg/torture/pr42363.c: Same.
	* gcc.dg/tree-ssa/ssa-ccp-2.c: Same.

From-SVN: r255469

1 files changed, 21 insertions, 19 deletions

diff --git a/gcc/ada/gcc-interface/utils.c b/gcc/ada/gcc-interface/utils.c
index 2c80a61..ddeeb03 100644
--- a/gcc/ada/gcc-interface/utils.c
+++ b/gcc/ada/gcc-interface/utils.c
@@ -110,45 +110,47 @@ const struct attribute_spec gnat_internal_attribute_table[] =
   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler,
        affects_type_identity } */
   { "const",        0, 0,  true,  false, false, handle_const_attribute,
-    false },
+    false, NULL },
   { "nothrow",      0, 0,  true,  false, false, handle_nothrow_attribute,
-    false },
+    false, NULL },
   { "pure",         0, 0,  true,  false, false, handle_pure_attribute,
-    false },
+    false, NULL },
   { "no vops",      0, 0,  true,  false, false, handle_novops_attribute,
-    false },
+    false, NULL },
   { "nonnull",      0, -1, false, true,  true,  handle_nonnull_attribute,
-    false },
+    false, NULL },
   { "sentinel",     0, 1,  false, true,  true,  handle_sentinel_attribute,
-    false },
+    false, NULL },
   { "noreturn",     0, 0,  true,  false, false, handle_noreturn_attribute,
-    false },
+    false, NULL },
   { "noinline",     0, 0,  true,  false, false, handle_noinline_attribute,
-    false },
+    false, NULL },
   { "noclone",      0, 0,  true,  false, false, handle_noclone_attribute,
-    false },
+    false, NULL },
   { "leaf",         0, 0,  true,  false, false, handle_leaf_attribute,
-    false },
+    false, NULL },
   { "always_inline",0, 0,  true,  false, false, handle_always_inline_attribute,
-    false },
+    false, NULL },
   { "malloc",       0, 0,  true,  false, false, handle_malloc_attribute,
-    false },
+    false, NULL },
   { "type generic", 0, 0,  false, true, true, handle_type_generic_attribute,
-    false },
+    false, NULL },
 
   { "vector_size",  1, 1,  false, true, false,  handle_vector_size_attribute,
-    false },
+    false, NULL },
   { "vector_type",  0, 0,  false, true, false,  handle_vector_type_attribute,
-    false },
-  { "may_alias",    0, 0, false, true, false, NULL, false },
+    false, NULL },
+  { "may_alias",    0, 0, false, true, false, NULL, false, NULL },
 
   /* ??? format and format_arg are heavy and not supported, which actually
      prevents support for stdio builtins, which we however declare as part
      of the common builtins.def contents.  */
-  { "format",     3, 3,  false, true,  true,  fake_attribute_handler, false },
-  { "format_arg", 1, 1,  false, true,  true,  fake_attribute_handler, false },
+  { "format",     3, 3,  false, true,  true,  fake_attribute_handler, false,
+    NULL },
+  { "format_arg", 1, 1,  false, true,  true,  fake_attribute_handler, false,
+    NULL },
 
-  { NULL,         0, 0, false, false, false, NULL, false }
+  { NULL,         0, 0, false, false, false, NULL, false, NULL }
 };
 
 /* Associates a GNAT tree node to a GCC tree node. It is used in