[cmake-developers] What about #line like feature in cmake language?

[Matthew Woehlke]

On 2014-05-15 08:36, Ben Boeckel wrote:
> On Thu, May 15, 2014 at 12:45:27 +0200, Nicolas Desprès wrote:
>> Nope. These variables are the cmake equivalent to the __LINE__ and __FILE__
>> C-pre-processor macro. What I need is the #line directive equivalent which
>> force the value of these variables so that error messages reported by cmake
>> uses the forced value. 
> 
> If you'd like to try a patch, the relevant code is in
> Source/cmExprParser*. Add a callback for #line nnn and update the
> CurrentLine variable cmExprParserHelper.cxx. Don't forget tests :) .
> 
> This will also likely need a policy since there's no guarantee that
> #line "directives" don't exist in already existing code as comments.

Maybe we should not introduce pragma-like constructs that are
indistinguishable from comments? :-)

TBH I'd be a little ambivalent about such a feature. A line pragma
itself isn't too bad, but opening the door for other types of pragmas
makes me a little more nervous :-).

-- 
Matthew