[fpc-pascal] Compiling arm-embedded fpc

[Michael Ring]

I could reproduce the problem on Fedora 18 x86_64. The error shows up in 
revision 23457, the only file changed in this revision is 
compiler/arm/aoptcpu.pas.

Checkin comment for file was:

Revision *23457* 
<http://svn.freepascal.org/cgi-bin/viewvc.cgi?view=revision&revision=23457> 
- (view 
<http://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/compiler/arm/aoptcpu.pas?revision=23457&view=markup>) 
(annotate 
<http://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/compiler/arm/aoptcpu.pas?annotate=23457>) 
- [select for diffs] 
<http://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/compiler/arm/aoptcpu.pas?r1=23457&view=log> 

Modified /Sun Jan 20 14:57:43 2013 UTC/ (4 days, 6 hours ago) by /florian/
File length: 108993 byte(s)
Diff to previous 23456 
<http://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/compiler/arm/aoptcpu.pas?r1=23456&r2=23457> 


* improve ShiftShiftShift2ShiftShift to look further ahead
* check register usage so the destination register can be differen


On a mac the problem does not exist, there i can build latest revision 
in svn without problems after applying Jeppe's patch for the IT problem 
(Thank you for that one, Jeppe!!)

So, Koenraad, perhaps you can do a svn update -r 23456 (or 23455) and 
retry the build, then you should hopefully have a very recent version of 
arm-embedded compiler+rtl.

The compiler segfaults when trying to compile rtl:

make -C embedded all
make[3]: Entering directory `/home/ring/devel/fpc/rtl/embedded'
/usr/bin/mkdir -p /home/ring/devel/fpc/rtl/units/arm-embedded
/home/ring/devel/fpc/compiler/ppcrossarm -Cparmv7m @rtl.cfg -Ur 
-Tembedded -Parm -XParm-embedded- -Xr -Ur -Xs -O2 -n -Fi../inc -Fi../arm 
-FE. -FU/home/ring/devel/fpc/rtl/units/arm-embedded -darm -dRELEASE  -Us 
-Sg system.pp
make[3]: *** [system.ppu] Segmentation fault (core dumped)
make[3]: Leaving directory `/home/ring/devel/fpc/rtl/embedded'


Michael


Am 24.01.13 12:32, schrieb Jeppe Græsdal Johansen:
> Den 24-01-2013 12:16, Koenraad Lelong skrev:
>> On 24-01-13 11:24, Jeppe Græsdal Johansen wrote:
>>> Looks like a memory corruption problem. I just tried to compile trunk
>>> with 2.6.0 as a starting compiler on win32 and had no problems(apart
>>> from the broken RTL).
>>>
>>> What starting compiler and what os/cpu are you on?
>>>
>>
>> Hi,
>>
>> What do you mean with memory corruption ? Is the memory of my PC 
>> broken, or is the compiler messing with the memory and then corrupts 
>> it ?
>> As far as I see it's not possible to compile the RTL. That's my 
>> problem. The crosscompiler seems OK, when I run "ppcrossarm -i" I see 
>> the output I expect.
>> I'm trying to be as clear as possible, but sometimes I presume too 
>> much and the reader does not understand what I want to say :-(
>> What I was trying to do is pinpointing where it goes wrong. So I 
>> manualy tried running the last line before the compilation (how to do 
>> that : see the wiki) stopped with the segmentation fault. And I did 
>> this with gdb to get a backtrace. That's what I sent to the list.
>>
>> You say you can't compile the RTL, what error do you get ?
>>
>> I'm compiling this with FPC 2.6.0, on Opensuse 12.1 64 bit.
>>
>> Anyway, thanks for your reply.
>>
>> Regards,
>>
>> Koenraad Lelong.
>>
>> _______________________________________________
>> fpc-pascal maillist  -  fpc-pascal at lists.freepascal.org
>> http://lists.freepascal.org/mailman/listinfo/fpc-pascal
> What I mean is that I think the crash you experience means there's a 
> bug in the compiler because your backtrace showed it crashed inside 
> the heap manager.  A typical sign after someone is using deallocated 
> memory, or having buffer overflows.
>
> I have fixed the issue with the RTL and submitted a patch: 
> http://bugs.freepascal.org/view.php?id=23738
> It was the same you wrote about some time ago.
> _______________________________________________
> fpc-pascal maillist  -  fpc-pascal at lists.freepascal.org
> http://lists.freepascal.org/mailman/listinfo/fpc-pascal
>

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