Re: [Lmod-users] [EXTERNAL] Re: changes to tcl 'break' statement in lmod 8 series

[Robert M. <mc...@ta...>]

It is not a bug.  There was no support for break in Lmod before 8.6+.  It
is just that having the tcl interpreter as a separate program meant that
you got away with it.


> Do you mean that all of the 8.x versions include their own TCL
interpreter, and 7.x relies on the system's TCL interpreter?
Yes

> We typically get Lmod from the OS vendor; is there a quick way to find
out if the TCL interpreter was included?

 $ module --config 2>&1 | grep -i "Use attached TCL"
Use attached TCL over system call  yes

I would be best if you upgraded to Lmod 8.6.15 or later

Best,
Robert

On Mon, Mar 21, 2022 at 4:06 PM Shrader, David Lee <dsh...@la...>
wrote:

> Hey Robert,
>
>
> If I understand what you are saying, there should be no difference in how
> break is handled between 7.x and <8.6? If that is the case, then we may
> have hit a bug of some sort. But, since the latest version of Lmod is quite
> a ways beyond what we're looking to get (8.4.10), there may be little
> utility in trying to track it down. It might just be easier to try to get
> our upstream to provide an 8.6+...
>
>
> Do you mean that all of the 8.x versions include their own TCL
> interpreter, and 7.x relies on the system's TCL interpreter?
>
>
> We typically get Lmod from the OS vedor; is there a quick way to find out
> if the TCL interpreter was included?
>
> Thanks again!
>
> David
>
>
> ------------------------------
> *From:* Robert McLay <mc...@ta...>
> *Sent:* Monday, March 21, 2022 2:40 PM
> *To:* Shrader, David Lee
> *Cc:* lmod-users
> *Subject:* [EXTERNAL] Re: [Lmod-users] changes to tcl 'break' statement
> in lmod 8 series
>
> Well yes and no.  There is no change in how break is or has been handled
> since forever. The change in supporting break is in Lmod 8.6+
>
> The change is that by default Lmod now includes the TCL interpreter as
> part of the Lmod executable instead of executing a system call
> (/usr/bin/tclsh ....).  You can configure Lmod to not include the tcl
> interpreter library as part of Lmod.  That should give you the old
> behavior.  Use --with-fastTCLInterp=no to configure Lmod without the tcl
> integration.
>
> I would be interested in seeing how Lmod 8.6+ works with your modules even
> if you don't deploy it to users.
>
>
> Best,
> Robert.
>
>
> On Mon, Mar 21, 2022 at 2:20 PM Shrader, David Lee via Lmod-users <
> lmo...@li...> wrote:
>
>> Hello,
>>
>>
>> We're are potentially going from Lmod 7.8.16 to 8.4.10, and we have
>> noticed that our tcl modulefiles that call "break" after a "puts stderr
>> ..." message now generate something like the following error:
>>
>>
>> Lmod has detected the following error:  Unable to load module because of
>> error when evaluating modulefile: foo3
>>      /modulefiles/foo3/1.0: [string "LmodMsgRaw([===[already set..."]:4:
>> unexpected symbol near '}'
>>
>> We have used this method of "puts stderr...; break" to exit out of a
>> particular modulefile when an error occurs, such as a missing directory.
>>
>> In looking over the readthedocs tcl function page, it looks like the
>> "break" function has seen some attention, but we are looking at 8.4.10, not
>> 8.6+. Did something change for the "break" command in 8.0 to 8.5 such that
>> it won't work as we have been using it in 7.x?
>>
>>
>> Thank you very much for any and all help!
>>
>> David
>>
>>
>> --
>> David Shrader
>> HPC-ENV High Performance Computing Systems
>> Los Alamos National Lab
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>
>
> --
> Robert McLay, Ph.D.
> Manager of Software Tools, HPC
> mc...@ta...
>
>

-- 
Robert McLay, Ph.D.
Manager of Software Tools, HPC
mc...@ta...