[Bug bootstrap/66038] [5 regression] (stage 2) build/genmatch issue (gcc/hash-table.h|c) with --disable-checking [ introduced by r218976 ]

["rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66038

--- Comment #21 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Douglas Mencken from comment #20)
> I'm lost. “Vanilla” 5.1.0 configured without --disable-checking went thru
> stage2 w/o any issue...

That's interesting - we might run into a miscompilation here.  Can you
check with --disable-checking again but with just the gcc_checking_assert
in hash_table_mod1 removed?

Please also attach preprocessed source of genmatch.c for the stage2 build
so it's possible to investigate that with a cross compiler.  (preprocessed
source with --disable-checking and the assert left in place)

Btw, thanks for your help in tracking this down.

I wonder if anybody tried a powerpc-linux bootstrap with --disable-checking...
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Subject: [Bug c++/66211] [5/6 Regression] Rvalue conversion in ternary operator causes internal compiler error
Date: Thu, 21 May 2015 07:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf211

--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 20 May 2015, jakub at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?idf211
>
> --- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> Perhaps just guard this particular match.pd pattern with GIMPLE guard for now
> (until the delayed C++ folding is committed)?

Will try.