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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug go/101407] non-determinism in -fdump-go-spec
Date: Mon, 12 Jul 2021 13:09:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101407

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|ian at airs dot com                |jakub at gcc dot gn=
u.org
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-07-12

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 51140
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51140&action=3Dedit
gcc12-pr101407.patch

I can reproduce it.  The problem is that hash_set for pointers by default u=
ses
ptr_hash, which hashes the pointer values rather than strings they point to,
and that hash_set is then traversed and type lines are emitted during that
traversal.  So, with address space randomization the strings hash different=
ly
between different runs.  This patch changes it to hash the strings instead =
and
that should be reproduceable.=