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STARDEV  March 2014

STARDEV March 2014

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Subject:

Re: GAIA ok?

From:

"Peter W. Draper" <[log in to unmask]>

Reply-To:

Starlink development <[log in to unmask]>

Date:

Thu, 6 Mar 2014 15:03:01 +0000

Content-Type:

MULTIPART/MIXED

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (79 lines)

On Wed, 5 Mar 2014, Tim Jenness wrote:

>       On Wed, Mar 5, 2014 at 12:50 PM, Graham Bell
>       <[log in to unmask]> wrote:
>                   I first would like to know if (a) GAIA
>                   works for anyone after the update
>                   and (b) it specifically works for people
>                   running mavericks.
> 
> 
> It works for me in my build on ipu.  I would have rebuilt
> Starlink after the autotools merge, but into my existing
> Starlink install tree.
> 
> 
> ipu is a linux box? And it works with the catalogue copy?
> 
> Running the debugger I'm getting the crash in tclStrToD when trying to
> parse a long number 922337203685477580.
> 
> 
> For the record the number is 9223372036854775808 (I had dropped a digit)
> which in negative form is VAL__BADK and in positive form is one largest than
> the largest signed 64-bit integer.
> 
> It turns out that tcl seems to dislike the -ftrapv compiler flag and this
> large 64-bit integer causes an overflow.
> 
>        -ftrapv
> 
>            Generate code to catch integer overflow errors.  Signed integer
> overflow
> 
>            is undefined in C, with this flag, extra code is generated to
> detect
> 
>            this and abort when it happens.
> 
> 
> I must have had the -ftrapv in there for testing SMURF and forgot about it.
> TCL seems to have a bug in it but I can't really test with tcl/tk 8.6 as
> Starlink won't build with that version (which is another problem in itself).
> I couldn't really work out which line of tcl code was causing the bug, just
> that it was being asked to parse that large number.

FYI:

The crash happens in clock.tcl, around:

     # Package up a list of tuples, each of which contains transition time,
     # seconds east of Greenwich, DST flag and time zone abbreviation.

     set r {}
     set lastTime $MINWIDE
     foreach t $times c $codes {
         if { $t < $lastTime } {
             return -code error "$fileName has times out of order"
         }
         set lastTime $t
         lassign [lindex $types $c] gmtoff isDst abbrInd
         set abbrev [dict get $abbrevs $abbrInd]
         lappend r [list $t $gmtoff $isDst $abbrev]
     }

MINWIDE is defined as: -9223372036854775808. The offending line in GAIA 
is:

   clock format [clock seconds] -format "%d-%b-%Y"

just getting a date to append to the copied file.

The same issue would probably happen with Tcl 8.6 as clock.tcl still 
uses this code.

Cheers,

Peter.

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