Hi!
The following testcase ICEs, because the ctors during cc1plus all have
!opt_for_fn (decl, flag_semantic_interposition) - they have NULL
DECL_FUNCTION_SPECIFIC_OPTIMIZATION (decl) and optimization_default_node
is for -Ofast and so has flag_semantic_interposition cleared.
During free lang data, we set DECL_FUNCTION_SPECIFIC_OPTIMIZATION (decl)
for the ctor which has body (or for thunks), but don't touch it for
aliases.
During lto1 optimization_default_node reflects the lto1 flags which
are -O2 rather than -Ofast and so has flag_semantic_interposition
set, for the ctor which has body that makes no difference, but as the
alias doesn't still have DECL_FUNCTION_SPECIFIC_OPTIMIZATION (decl) set,
we now trigger this verification check.
The following patch just doesn't verify it for aliases during lto1.
Another possibility would be to set DECL_FUNCTION_SPECIFIC_OPTIMIZATION (decl)
during free lang data even for aliases.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2022-04-28 Jakub Jelinek <ja...@redhat.com>
PR lto/105399
* cgraph.cc (cgraph_node::verify_node): Don't verify
semantic_interposition flag against
opt_for_fn (decl, flag_semantic_interposition) for aliases in lto1.
* g++.dg/lto/pr105399_0.C: New test.
--- gcc/cgraph.cc.jj 2022-04-20 09:24:12.194579146 +0200
+++ gcc/cgraph.cc 2022-04-27 11:53:52.102173154 +0200
@@ -3488,7 +3488,9 @@ cgraph_node::verify_node (void)
"returns a pointer");
error_found = true;
}
- if (definition && externally_visible
+ if (definition
+ && externally_visible
+ && (!alias || thunk || !in_lto_p)
&& semantic_interposition
!= opt_for_fn (decl, flag_semantic_interposition))
{
--- gcc/testsuite/g++.dg/lto/pr105399_0.C.jj 2022-04-27 11:54:25.659703199
+0200
+++ gcc/testsuite/g++.dg/lto/pr105399_0.C 2022-04-27 11:48:31.387664565
+0200
@@ -0,0 +1,9 @@
+// PR lto/105399
+// { dg-lto-do link }
+// { dg-lto-options { { -fPIC -flto -Ofast } } }
+// { dg-require-effective-target shared }
+// { dg-require-effective-target fpic }
+// { dg-extra-ld-options "-shared -O2" }
+
+struct S { S (); };
+S::S () {}
Jakub
