https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65380

--- Comment #11 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Created attachment 35050
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35050&action=edit
one.o.000i.cgraph: -fdump-ipa-cgraph for the LTO step for the unpatched GCC
(r221482)

(In reply to Jan Hubicka from comment #8, #9 and #10)

First, I can still reproduce the issue with the unpatched GCC. In addition, the
big program also compiles successfully with -fno-ipa-icf.

Regarding "ld": As /usr/bin/ld is very old, that's with the current "ld" from
the binutils-gdb GIT (via GCC's --with-plugin-ld=) - it fails identical when I
replace the ld.bfd by ld.gold.

Regarding -fdump-ipa-cgraph: If you prefer the dump of a patched version,
please tell me.

Regarding the patch in comment 8 (with "ExTERNAL" typo fixed): Unfortunately,
it doesn't solve the problem - I still get the same ICE.


Regarding the patch in comment 9: I had to change "alias" to "alias_item" due
to

../../gcc/ipa-icf.c:1779:22: error: ‘alias’ was not declared in this scope
   if (DECL_EXTERNAL (alias->decl))

but afterwards: It no longer has an ICE!
>From gcc-bugs-return-480624-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Mar 18 08:22:24 2015
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Subject: [Bug target/65459] New: munaligned-access still produce split access codes
Date: Wed, 18 Mar 2015 08:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65459

            Bug ID: 65459
           Summary: munaligned-access still produce split access codes
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ma.jiang at zte dot com.cn

Hi all,
  The munaligned-access option on ARM can not stop gcc from producing split
access codes. A very simple test 
char mt[20];
void main()
{
    void *mm=&(mt[1]);
  *(( int *)mm)=4;
}
  compiled with -O2 -munaligned-access could reproduce this problem.As we can
see,"*(( int *)mm)=4;"  cause gcc to emit 4 strb instructions not a unaligned
stw .
  In my opinion, this bug is caused by the SLOW_UNALIGNED_ACCESS macro,which is
defined to be 1 in arm.h. It is very strange that  the munaligned-access option
can affect neither  SLOW_UNALIGNED_ACCESS nor STRICT_ALIGNMENT. On PPC,the
mstrict-align can affect STRICT_ALIGNMENT， and SLOW_UNALIGNED_ACCESS is
determined by STRICT_ALIGNMENT, ALIGN, and MODE(args of the
SLOW_UNALIGNED_ACCESS macro). This is a good example for ARM, I think.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide458

--- Comment #1 from vries at gcc dot gnu.org ---
Created attachment 35051
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id5051&actioníit
tentative patch