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Re: Optimise away eh_frame advance_loc 0

From: Joseph Myers <joseph at codesourcery dot com>
To: Alan Modra <amodra at gmail dot com>
Cc: <binutils at sourceware dot org>
Date: Mon, 28 Oct 2019 16:16:30 +0000
Subject: Re: Optimise away eh_frame advance_loc 0
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Ironport-sdr: vDK2fnbGM9DZkQrmNfNM/fQjxKvU62lZJ5BLxPjb62VIbLdAyMZ+o+TppAI6KWnDIIn3JVEEzY FyPacyRHk+Bvyhasvl73Ve7K5JG7rGbP2sB88/L0FO4GUGCgkOgVIAZ8ziB7LLS+RvzyIm/VIS Kd3+mfi755hdCok9jol/6ioQRhH8aJz1bFbs25O2lKqQN6KC+TI8EFOzAlrFEUVWRM1m8tqiuk wttm8T7nP+1dQIeZOUxiTtk02T6YhRUL0r3kdolQ5cvXwQ3lH1f+yDrWELFn87oOuGul48lupt GKY=
References: <20191026095443.GD3433@bubble.grove.modra.org>

This breaks the build of glibc for sh4-linux-gnu (confirmed this is the 
revision that introduces the breakage) and mips64-linux-gnu (not tested 
the specific revisions, but the symptoms are the same so it looks like 
the same breakage).

https://sourceware.org/ml/libc-testresults/2019-q4/msg00129.html

I've attached malloc.s (gzipped) from an sh4-linux-gnu glibc build.  The 
symptom is:

$ sh4-glibc-linux-gnu-as -little -o malloc.o malloc.s
malloc.s: Assembler messages:
malloc.s: Fatal error: can't write -1 bytes to section .debug_frame of malloc.o: 'bad value'

(and binutils commit 6f69abb0498286297936a178ba81c7e445aa4437 fails while 
the previous commit passes).

-- 
Joseph S. Myers
joseph@codesourcery.com

Attachment: malloc.s.gz
Description: application/gzip

Follow-Ups:
- Re: Optimise away eh_frame advance_loc 0
  - From: Jeff Law
- Re: Optimise away eh_frame advance_loc 0
  - From: Alan Modra

References:
- Optimise away eh_frame advance_loc 0
  - From: Alan Modra

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