Re: [boost] [cmake] Pull request announcement

Subject: Re: [boost] [cmake] Pull request announcement
From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2018-09-17 12:30:07

On Mon, Sep 17, 2018 at 6:09 AM Alexander Grund via Boost <
boost_at_[hidden]> wrote:

>
> >> This won't be to bad either once the variants problem above is
> >> solved. CTest is quite powerful so except for a few corner cases I
> >> expect it to be straight forward.
> >
> > CTest has absolutely no notion of compile-time testing. This was
> > mentioned to CMake on their mailing list a long time ago and got the
> > usual yawns from the CMake people.
> This is not entirely true. I myself did write such tests. It is simply
> an invocation of "${CMAKE_COMMAND} --build . --config $<CONFIG> --target
> ..." added with `add_test` and setting the property `WILL_FAIL` to TRUE.
> I even went a step further and added a macro which will add 2 targets,
> where one as a preprocessor macro defined. The test then checks that
> compilation succeeds when the macro is not defined and it doesn't when
> it is. This makes sure the "faulty" code is indeed the source of error.
> You could also use a regex to match the error.
>
> Yes this is not as straight forward as it could be, but neither is the
> way in bjam: You need to call some macro/function/... and that does the
> magic.
>

Ha?

===
compile-fail my_test.cpp ;
===

-- 
-- Rene Rivera
-- Grafik - Don't Assume Anything
-- Robot Dreams - http://robot-dreams.net