[M3devel] cm3cg failing on linuxlibc6

[Darko Volaric]

This, perhaps: https://github.com/modula3/cm3/issues/10

On Fri, May 27, 2016 at 8:45 PM, Rodney M. Bates <rodney_bates at lcwb.coop>
wrote:

> I got around this problem by setting Alloca_jmpbuf back to TRUE in
>
> m3-libs/m3core/src/runtime/ex_frame/RTExFrame.m3 and
> m3-sys/m3middle/src/Target.m3
>
> I am trying to remember, but as I recall, TRUE was failing on some other
> platform,
> and the change was reverted.  But now FALSE is failing on LINUXLIBC6 and
> TRUE
> is working there.
>
> What do you remember about this, Jay?
>
>
>
> On 05/23/2016 01:40 PM, Rodney M. Bates wrote:
>
>>
>>
>>
>> I did git pull and rebuilt on LINUXLIBC6.  The built cm3 executable
>> crashes compiling
>> a very small experiment program:
>>
>>    rodney at yellowstone:~/proj/m3/exp/FmtBug/src$ cm3-
>>    Segmentation fault (core dumped)
>>
>> m3gdb (after I built it) gives this:
>>
>>    rodney at yellowstone:~/proj/m3/exp/FmtBug/src$ m3gdb cm3-
>>    GNU gdb plus Modula-3 6.4
>>    Copyright 2005 Free Software Foundation, Inc.
>>    GDB is free software, covered by the GNU General Public License, and
>> you are
>>    welcome to change it and/or distribute copies of it under certain
>> conditions.
>>    Type "show copying" to see the conditions.
>>    There is absolutely no warranty for GDB.  Type "show warranty" for
>> details.
>>    This GDB was configured as "i686-pc-linux-gnu"...Using host
>> libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
>>
>>    (m3gdb) run
>>    Starting program: /usr/local/cm3-githead/bin/cm3-
>>    [Thread debugging using libthread_db enabled]
>>    [New LWP 23615]
>>    [New Thread -1216829744 (LWP 23615)]
>>
>>    Program received signal SIGSEGV, Segmentation fault.
>>    [Switching to Thread -1216829744 (LWP 23615)]
>>    0x0037c26f in siglongjmp () from /lib/tls/i686/cmov/libc.so.6
>>    (m3gdb) bt
>>    #0  0x0037c26f in siglongjmp () from /lib/tls/i686/cmov/libc.so.6
>>    #1  0x577b2a84 in ?? ()
>>    Cannot access memory at address 0xd7a0906f
>>    (m3gdb) quit
>>
>>
>> stock gdb gives even less information:
>>
>>    rodney at yellowstone:~/proj/m3/exp/FmtBug/src$ gdb cm3-
>>    GNU gdb (GDB) 7.1-ubuntu
>>    Copyright (C) 2010 Free Software Foundation, Inc.
>>    License GPLv3+: GNU GPL version 3 or later <
>> http://gnu.org/licenses/gpl.html>
>>    This is free software: you are free to change and redistribute it.
>>    There is NO WARRANTY, to the extent permitted by law.  Type "show
>> copying"
>>    and "show warranty" for details.
>>    This GDB was configured as "i486-linux-gnu".
>>    For bug reporting instructions, please see:
>>    <http://www.gnu.org/software/gdb/bugs/>...
>>    Reading symbols from /usr/local/cm3-githead/bin/cm3-...done.
>>    (gdb) run
>>    Starting program: /usr/local/cm3-githead/bin/cm3-
>>    [Thread debugging using libthread_db enabled]
>>
>>    Program received signal SIGSEGV, Segmentation fault.
>>    0x0032e26f in ?? () from /lib/tls/i686/cmov/libc.so.6
>>    (gdb) bt
>>    #0  0x0032e26f in ?? () from /lib/tls/i686/cmov/libc.so.6
>>    #1  0xfb35d04b in ?? ()
>>    Cannot access memory at address 0x7bee2da0
>>    (gdb)
>>
>> Note that gdb gives a different address in the same library for the point
>> of fault.
>>
>> m3gdb claims it's in siglongjmp.  I recall there were some recent changes
>> involving
>> longjump.
>>
>>
>>
>>
>>
>> On 05/22/2016 09:28 PM, Peter McKinna wrote:
>>  > I dont know what changed but the backend is crashing on linuxlibc6
>> when compiled with -O Try compiling m3core.
>>  >
>>  > Also some of my low level tests with Long.And and Long.Shift are not
>> working with
>>  > normal compile without the optimisations on that platform. Bit
>> suspicious. I'm still investigating.
>>  >
>>  > Anyone got any clues or can replicate?
>>  >
>>  > Thanks Peter
>>  >
>>  >
>>  >
>>  >
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>>  >
>>
>>
>>
> --
> Rodney Bates
> rodney.m.bates at acm.org
> _______________________________________________
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>
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