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Subject:	Re: DJGPP v2.05 and Windows 10
To:	djgpp AT delorie DOT com
References:	<562BCDB5 DOT 8000402 AT iki DOT fi>
	<CAB9Rao_2QazAWzGWU5nxVHzCQvXi7n4Ni2A008VGvHq9UuKXVg AT mail DOT gmail DOT com>
From:	"Andris Pavenis (andris DOT pavenis AT iki DOT fi) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Message-ID:	<562DBA23.9040506@iki.fi>
Date:	Mon, 26 Oct 2015 07:29:07 +0200
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On 10/24/2015 09:46 PM, Louis Santillan (lpsantil AT gmail DOT com) [via djgpp AT delorie DOT com] wrote:
> Andris, is it possible that you have a bad memory chip?  Maybe
> something in 4.x, 5.x, 6.x gcc grows the memory image into the bad
> pages while 3.x does not and/or does utilize (read/write) those bad
> pages.

I do not think that bed memory could be a reason. I would have noticed it log time ago
in Linux (all mentioned tests were done in Win 10 VM under Fedora 22 x86_64). I have seen
random compilation errors in Linux on a different  system which was caused by RAM problems
some  years ago. Never seen anything like that on this system.

Also
- initial impression is that gcc-4.4.7 is OK and works under Win10 (bootstrapped it under Win10
using gcc-3.4.6 without problems)
- some changes in environment (update VirtualBox 4.3 to VirtualBox-5.0, change of DJGPP installation
to have more than 1 gcc version installed at the same time with additional bin directories with 
different
names) causes symptoms to change. Now I have one reproducible NTVDM crash I can workaround by 
increasing
gcc garbage collection threshold (could be caused by memory corruption, so avoiding GC could avoid 
crash)

Andris

>
> On Sat, Oct 24, 2015 at 11:28 AM, Andris Pavenis
> (andris DOT pavenis AT iki DOT fi) [via djgpp AT delorie DOT com] <djgpp AT delorie DOT com>
> wrote:
>> Did some additional tests on WIndows 10.
>>
>> I'm getting random compile failures with gcc-4.9.3, gcc4.5.2 and gcc 6.0.0
>> 20151018 experimental (last development version I built for DJGPP).
>> Running
>>
>> echo '#include <iostream>" | gcc -E -dD -x c++ -
>>
>> in loop and comparing outputs is sufficient for detecting random corruption.
>> I have not succeeded to find why it happens and how to workaround that.
>> Additionally I'm also getting random failures when trying to repeatedly
>> compile same preprocessed C++ file.
>>
>> The situation is however not completely hopeless:
>> Installed gcc-3.4.6 and bootstrapped the same gcc version (3.4.6) without
>> problems under Windows 10. No random gcc failures observed.
>>
>> So some difference (or differences) between gcc-3.4.6 and recent version
>> cause problems.
>> Some suspects:
>> - change to C++ as implementation language
>> - noticeable increase of size of executables and resources required by them
>>
>> Andris
>>
>>
>>
>>
>>

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