Re: [Bug-GnuCOBOL] Compiler crashes in empty perform when debugging mode was specified

[Simon Sobisch]

Hi Harald,

nice to hear that you find the compiler useful. Please report about your
project and minor flaws cobc does not accept in the user list
gnucobol-users. Despite of that fixing code (including COBOL code) is
always a better idea than a too laxed syntax check you may want to try
to recompile with -frelax-syntax. It would be good to know if there are
some COBOL code flaws that aren't compiled with this flag (if you get
"obsolete" messages you may silence them, too [they are in because the
recent COBOL standards mark them as obsolete]).

Concerning the bug: thank you for posting this, a SIGSEGV should never
occur. I could reproduce it and put a fix for the SIGSEGV in. It doesn't
crash any more but the debugging code that is normally generated won't
be added in the empty inline PERFORM - I'm not sure if this is correct
and asked Edward Hard to recheck this (I'm away for the next days + week).
If anybody knows what the correct thing to do is please respond.
In any case you either add the CONTINUE or - if these are too many
places use the current svn version.

Simon

Am 13.04.2017 um 10:47 schrieb Harald Cordes | ITGAIN:
> Hi,
> 
>  
> 
> I’m evaluating the usability of the GNU-COBOL-compiler for our purposes.
> 
> It looks good. I’ve found some issues we have to cope with,
> 
> e.g. where the compiler does not tolerate some minor flaws
> 
> and I’ve found a real bug. It’s a very minor one but I’d like to report it.
> 
>  
> 
> Adding a simple continuewithin the body of the inline-perform solves the
> problem.
> 
>  
> 
> The following program causes a crash of the GNU-COBOL-compiler:
> 
>  
> 
>  
> 
>        SOURCE-COMPUTER. IBM-390 WITH DEBUGGING MODE.
> 
>       
> 
>            PERFORM VARYING IND1 FROM 10 BY -1
> 
>                    UNTIL TST(IND1:1) NOT = SPACE
> 
>            END-PERFORM.
> 
>  
> 
> Message:
> 
>  
> 
> attempt to reference unallocated memory (signal SIGSEGV)
> 
>  
> 
> cobc: aborting compile of PERFFAIL.cbl at line 16
> 
>  
> 
>  
> 
> I’m using GNU-COBOL:
> 
>  
> 
> Built     Apr 12 2017 11:00:55
> 
> *Packaged  Nov 06 2016 22:36:19 UTC*
> 
> C version "4.3.2 [gcc-4_3-branch revision 141291]"
> 
>  
> 
> Operating-System – uname -a:
> 
> Linux j2u-devel-hc 2.6.27.54-0.2-default #1 SMP 2010-10-19 18:40:07
> +0200 x86_64 x86_64 x86_64 GNU/Linux
> 
>  
> 
>  
> 
> Best regards / mit freundlichem Gruß
> 
> Harald Cordes
> 
> IT-Berater
> 
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