On Wed, Feb 24, 2021 at 07:08:34PM -0500, Jason Merrill via Gcc-patches wrote:
> gcc/ChangeLog:
>
> PR c++/96078
> * cgraphunit.c (process_function_and_variable_attributes): Don't
> warn about flatten on an alias if the target also has it.
> * cgraph.h (symtab_node::get_alias_target_tree): New.
>
> gcc/testsuite/ChangeLog:
>
> PR c++/96078
> * g++.dg/ext/attr-flatten1.C: New test.
This broke the gcc.dg/attr-flatten-1.c test, where we no longer
warn because attribute flatten is both on the alias target and on the alias.
> - warning_at (DECL_SOURCE_LOCATION (node->decl), OPT_Wattributes,
> - "%<flatten%> attribute is ignored on aliases");
> + tree tdecl = node->get_alias_target_tree ();
> + if (!tdecl || !DECL_P (tdecl)
> + || !lookup_attribute ("flatten", DECL_ATTRIBUTES (tdecl)))
> + warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes,
> + "%<flatten%> attribute is ignored on aliases");
Seems that was the intentional change though, so can we apply
following change to fix that?
Bootstrapped/regtested on x86_64-linux and i686-linux:
2021-03-05 Jakub Jelinek <ja...@redhat.com>
PR c/99363
* gcc.dg/attr-flatten-1.c: Remove dg-warning directive.
--- gcc/testsuite/gcc.dg/attr-flatten-1.c.jj 2020-03-19 18:13:21.776787973
+0100
+++ gcc/testsuite/gcc.dg/attr-flatten-1.c 2021-03-05 15:18:27.176637165
+0100
@@ -10,7 +10,7 @@ int fn1(int p1)
}
__attribute__((flatten))
__attribute__((alias("fn1")))
-int fn4(int p1); /* { dg-warning "ignored" } */
+int fn4(int p1);
int
test ()
{
Jakub
