[CMake] Is CMake powerful enough?

[Eric Noulard]

2007/6/9, Oliver Kullmann <O.Kullmann at swansea.ac.uk>:
> Eric Noulard wrote:
>
> > I think, that with some amount of time (not so much) for defining
> > your own WHATEVER_EXECUTE CMake MACROs
> > you'll get the power of what you add before
> > with shell running in Makefile.
>
> Should be possible; definitely it looks better than macro
> definition in makefiles.
>
> > You may try my example with the attached file
> > and run
>
> > cmake -P python_execute.cmake
>
> > This example is a toy example, I am sure you
> > may accomplish something far better and useful.
>
> When using "/usr/bin/python" in the script, I get
>
> MYVAR = todays year is:2007
> ERROR =
>
> however with the script as given, which doesn't find a python
> interpreter,
> > /usr/sfw/bin/python
> bash: /usr/sfw/bin/python: No such file or directory
>
> I just get
>
> MYVAR =
> ERROR =
> > echo $?
> 0
>
> No error? (Apparently error output didn't work?)

Yes it does but I did not do all the check I need to do.
The fact in my example ERROR contains stderr of the
EXECUTED process but here the error is
th EXECUTION ITSELF failed.

So you get that in RESULT_VARIABLE of the EXECUTE_PROCESS
and not in ERROR_VARIABLE, which is simply void because
the process didn't run.

Sorry about MY poor example.
You'll find attached the modified CMake script which
handles RESULT_VARIABLE as expected.

> I know, it's always possible to write such scripts, but
> it's quite some work to make it work under many circumstances.

You are right but I think that you may take some time to write
1 to 5 robust CMake macros and then 'escape' the 'real'
dynamic and tricky parts in your favorite programming language
be it python, ruby, [t|z|ba]sh,

> But I guess writing all kinds of "subroutines" should be much
> easier in cmake than in make.

This is definitely my opinion.

-- 
Erk
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