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From: "wilson at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/94044] [10 Regression] internal compiler error: in
 comptypes, at cp/typeck.c:1490 on riscv64-unknown-linux-gnu and arm-eabi
Date: Sat, 14 Mar 2020 16:57:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94044

--- Comment #9 from Jim Wilson <wilson at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #8)
> So perhaps to ease reproduction, tweak the hash function in this case to
> always return 0?

Yes, that works.  I just didn't have a chance to look at the hash function =
last
night.  With the hash function hacked I can reproduce for any target and any
-std=3Dc++X value.

diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 789ccdb..4337928 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -1733,7 +1733,8 @@ hash_tmpl_and_args (tree tmpl, tree args)
 hashval_t
 spec_hasher::hash (spec_entry *e)
 {
-  return hash_tmpl_and_args (e->tmpl, e->args);
+  return 0;
+  //  return hash_tmpl_and_args (e->tmpl, e->args);
 }

 /* Recursively calculate a hash value for a template argument ARG, for use=