Re: [Tack-devel] Prime Mover commands

[tim k. <gt...@di...>]

At 7:15 AM -0400 7/31/06, David Given wrote:
>It's difficult to tell what's going on without seeing your code, but
>have you defined ROOTDIR as local? Local variables in Lua are
>fundamentally different things to global variables --- local variables
>are lexically scoped, and included scripts execute in a different scope
>and so won't see locals defined in the caller.

I see the problem now.  I had included the file that concatenates ROOTDIR
before I had defined ROOTDIR.  I was thinking the included pmfile (and its
local variables) wouldn't be evaluated until the target it contains is
built.

>> local d = ROOTDIR.."lib/libsa/"
>
>Because ROOTDIR here is used in a Lua expression, it'll get evaluated
>when the script is read, and so ROOTDIR must be defined before this line
>is seen. OTOH, if you were to say "%ROOTDIR%lib/libsa/" instead, then
>the %...% reference will only get expanded at the very last stage of
>execution, and will be looked up in the call stack of the rules
>currently being processed.

So using the %..% notation it is possible to temporarily repoint global
variables, and the actual value isn't used until the script actually
executes, correct?

>Sorry, pm doesn't necessarily have this information. However, if you
>were to put:
>
>print(somerule.VARIABLENAME)
>os.exit()

Ok, I'm a little slow on the uptake.  What should I use for "somerule?"
When explaining stuff to me, it is advisable to speak slowly and explictly;
otherwise I am likely to interpret what you say literally :-)

>Put:
>
>pm.intermediatecache = "path"
>
>...in your pmfile. (The ACK config.pm does this.)

Thanks!

>[...]
>> 4) Can I get some bare-bones description on differences between cfiles,
>> cprograms, clibraries, and other possible options?
>
>cfile compiles a single .c file into a single .o file. clibrary builds
>an ar archive out of its inputs. cprogram links all of its inputs
>together into an executable.

Thanks again!  Can I specify a single cfile as a target, if it is only
included in a larger group or cprogram?  Or do I need to have it as a
separate object?

>If you look in the pm Subversion repository, I've just checked in a
>bunch of test files in test-pmfiles and test-source --- you may find
>these useful to look at.

Excellent!  I will do this.  Is pm a top-level cvs module?

thanks again!
tim

Gregory T. (tim) Kelly
Owner
Dialectronics.com

P.O. Box 606
Newberry, SC 29108

"Anything war can do, peace can do better."  -- Bishop Desmond Tutu