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I am trying to implement conditional builds using the "unless=" clause in my <compiler> and <linker> clauses. I am generating the XML for my Cpptask-based builder. What I noticed is that if the user does not specify any source files for the linker, it blindly goes along and fires up a linker anyway with no source files. What is going on here? To reproduce this, I reduced the entire build file down to the case where I wanted it to do nothing, i.e. both my <compiler> and <linker> "unless=" clauses failed, and I noticed it said:
[cc] 0 total files to be compiled.
[cc] Starting link
[cc] gcc: no input files
Hmm... - it knows there are no files to compile and it does not call my compiler - good. But there are also no files to link - yet is still calls "gcc -c"!?!? It knows enough to not call MY linker (which is most definitely NOT gcc), but why it is blindly calling "gcc -c" for no reason whatsoever, and furthermore, how do I stop it?
So...my question is - how can I generate a build file, with conditional <compiler> and <linker> definitions in my <cc> task (using the "unless=" flag), and have it not do anything? It looks to me like I have no control over the default linker (gcc) - which is always called no matter what, and breaks the entire build process. That seems to defeat the purpose of the "unless=" clause.
Furthermore, if I define a <linker> with no input files, why is it even run? Should it not detect this case and not fire up the tool?