Re: [open-cobol-list] cobc Segmentation fault (core dumped)

[Michael Anderson]

Thanks Brian!
I think you may have misunderstood. It is not my program that is 
crashing, it is the compiler 'cobc' that is crashing.
So I would need to re-build the OC compiler with symbols/debugging on, 
that was my "howto" question.

Just as your email showed up I solved it.

The method I used, was to used the 'cobc -v"  output.

1. 'cat  /tmp/cob7521_0.c'
    In the temp C file I can see (the last line) the line of COBOL 
source where the crash happened.

2. Next I rearrange the source, and the look at the new temp C file.
    Now I have confirmed the line of COBOL source that cause the 
compiler to crash.

3. Next I start to comment out COBOL statements 1 by 1, until I get a 
good compile.

4. The problem turned out to be a String statement, where I ( mistakenly 
) was passing a 88 level item to a trim function within the string.

Example problem code:
     If Not Split-Transaction
         String Quote
             trim(Tr-Date)    quote "," quote
             trim(Tr-Payee)   Quote "," Quote
             trim(Tr-Memo)    " " trim(i-filename) " " trim(Tr-Cleared) 
Quote "," Quote
             trim(Tr-Amount)    Quote "," Quote
             trim(Tr-type)       Quote "," Quote
             trim(Tr-Category)  Quote "," Quote
             " "    Quote "," Quote
             trim(qifname) " " trim(Tr-Serialnumber) Quote
             Delimited By size into csv-record
         End-String
Was changed to:
     If Not Split-Transaction
         String Quote
             trim(Tr-Date)    quote "," quote
             trim(Tr-Payee)   Quote "," Quote
             trim(Tr-Memo)    " " trim(i-filename) " " trim(Tr-Cleared) 
Quote "," Quote
             trim(Tr-Amount)    Quote "," Quote
             trim(Tr-type)       Quote "," Quote
             trim(Tr-Category)  Quote "," Quote
             " "    Quote "," Quote
             trim(i-filename) " " trim(Tr-Serialnumber) Quote
             Delimited By size into csv-record
         End-String


Where i-filename is a string, and qifname is a 88 level item of pic 9.
And again, there was not a compiler error/warning, instead cobc 
generated a core file, a segmentation fault.

Thanks again,
Mike.



On 09/16/2013 01:30 PM, Brian Tiffin wrote:
> Micheal; Without seeing any code yet, you'll likely get better messages using
>
> cobc -v -g -debug -x -free -ffunctions-all
>
> Adding in the -g and -debug.  It should then crap out with a better
> message and leave source files around for gdb stepping.  (gdb requires
> the .c files to show source lines, and sadly I haven't yet put in the
> compiler code to allow stepping .cob source lines intermixed with the
> .c code that is actually running in the binary).
>
> If that doesn't work out, we can talk about listing the COBOL sources.
>
> Cheers,
> Brian
>
> On 9/16/13, Michael Anderson <address@hidden> wrote:
> > Hello all!
> >
> > I'm working on a personal tax project, and wrote a little conversion
> > utility.
> >
> > When I compile it, a SEGV occurs......
> >
> > Any pointers/hints to debug?
> > Any OC developers want to look at it?
> > I can send the cobol source to anyone interested.
> > Be forewarned, My COBOL coding style has angered some traditional COBOL
> > programmers.
> >
> > --
> > Thanks,
> > Mike.
> >
> > Screen scrape follows:
> >
> > $ cobc -v -x -free -ffunctions-all qif2csv.cob
> > preprocessing qif2csv.cob into /tmp/cob7521_0.cob
> > parsing /tmp/cob7521_0.cob (qif2csv.cob)
> > return status: 0
> > translating /tmp/cob7521_0.cob into /tmp/cob7521_0.c (qif2csv.cob)
> > Segmentation fault (core dumped)
> > j
> > $ gdb /usr/local/bin/cobc ./core
> > GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
> > Copyright (C) 2012 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 "i686-linux-gnu".
> > For bug reporting instructions, please see:
> > <http://bugs.launchpad.net/gdb-linaro/>...
> > Reading symbols from /usr/local/bin/cobc...(no debugging symbols
> > found)...done.
> > [New LWP 17921]
> >
> > warning: Can't read pathname for load map: Input/output error.
> > Core was generated by `cobc -x -Icopylib -free -ffunctions-all
> > qif2csv.cob'.
> > Program terminated with signal 11, Segmentation fault.
> > #0  0x080511f8 in cb_field_variable_address ()
> > (gdb)
> >
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