https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83346
--- Comment #1 from Andi Kleen <andi-gcc at firstfloor dot org> ---
This fixes it. Don't know why that node has no decl.
Will submit after a test cycle.
diff --git a/gcc/ipa-inline.c b/gcc/ipa-inline.c
index 7846e93d119..dcd8a3de1ac 100644
--- a/gcc/ipa-inline.c
+++ b/gcc/ipa-inline.c
@@ -2391,7 +2391,8 @@ ipa_inline (void)
entry of cycles, possibly cloning that entry point and
try to flatten itself turning it into a self-recursive
function. */
- if (lookup_attribute ("flatten",
+ if (node->decl
+ && lookup_attribute ("flatten",
DECL_ATTRIBUTES (node->decl)) != NULL)
{
if (dump_file)
