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bug#44531: 27.1; Emacs 27 fails to build from source on m68k (regression
From: |
Stefan Monnier |
Subject: |
bug#44531: 27.1; Emacs 27 fails to build from source on m68k (regression) |
Date: |
Tue, 16 Aug 2022 17:38:25 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
>> [...]
>> DUMP_RELOC_ALIGNMENT_BITS = 2,
>>
>> /* Minimum alignment required by dump file format. */
>> DUMP_RELOCATION_ALIGNMENT = 1 << DUMP_RELOC_ALIGNMENT_BITS,
>> [...]
>>
>> I can't see anything in the code which explains what this alignment
>> requirement is about. You can try lowering DUMP_RELOC_ALIGNMENT_BITS
>> to 1 and see if that works (long shot).
>
> IIUC, the top (DUMP_RELOC_TYPE_BITS - DUMP_RELOC_ALIGNMENT_BITS) of
> the relocation offsets stored by pdumper must be 0. That means we can
> only address the first 512 MB of the dump in ordinary 32-bit pdumper
> builds, and 256 MB on m68k with your fix. I'm not sure how useful a
> data point this is without real silicon, but I tried on an m68k
> emulator (qemu), could reproduce the bug, and your fix works there.
Any hope you can turn that into a patch?
Maybe with something like `#ifdef (__m68k__)`?
Stefan
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Stefan Monnier <=