'Re: [CMake] find_package with COMPONENTS never honors REQUIRED'

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List:       cmake
Subject:    Re: [CMake] find_package with COMPONENTS never honors REQUIRED
From:       Eric Noulard <eric.noulard () gmail ! com>
Date:       2018-08-30 18:32:17
Message-ID: CAPASGLoVhS_E7B-6Hjb0JrZviDWGs6km5F43qXSvSsvz6_xm0Q () mail ! gmail ! com
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Le jeu. 30 aoÃ»t 2018 Ã  20:03, George PF <george.p.f@mail.com> a Ã©crit :

> > The documentation is intriguing about REQUIRED COMPONENTS interaction....
>
> That's... one way to put it.
>

Yeah you know. Kind of ironic here :-)

> > So it is possible that the failure behavior when specifying COMPONENTS
> is up to the module...
>
> I admit I was not reading the docs in that depth, but REQUIRED can only
> mean one thing and should
> not need second guessing the documentation. Sadly, someone thought
> otherwise.
>

I guess there is no one to blame here.
The doc is too-realistic about the state of find modules.
At least Config mode should do it right I hope.
Module mode is historically for hand-written module maintained by
volunteers:
https://gitlab.kitware.com/cmake/community/wikis/doc/cmake/dev/Module-Maintainers

> Do you see this only with Qt or do other packages with components (may be
> Boost) behave like this?
> > I guess that Qt5 should be running in config mode, whereas boost must be
> in module mode though.
>
> I was debugging an older cmake project and wondered why it was not finding
> the non-standard Qt location,
> that's when I stumbled upon this issue.
>

I see. I think something could/should be done for Config mode, for Module
mode It would certainly depends on the module maintainer.

-- 
Eric

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<div dir="ltr"><br><br><div class="gmail_quote"><div dir="ltr">Le  jeu. 30 aoÃ»t 2018 \
Ã   20:03, George PF &lt;<a \
href="mailto:george.p.f@mail.com">george.p.f@mail.com</a>&gt; a Ã©crit  \
:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px \
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">&gt; The documentation \
is intriguing about REQUIRED COMPONENTS interaction....<br> <br>
That&#39;s... one way to put it.<br></blockquote><div><br></div><div>Yeah you know. \
Kind of ironic here :-)</div><div>     </div><blockquote class="gmail_quote" \
style="margin:0px 0px 0px 0.8ex;border-left:1px solid \
rgb(204,204,204);padding-left:1ex"> &gt; So it is possible that the failure behavior \
when specifying COMPONENTS is up to the module...<br> <br>
I admit I was not reading the docs in that depth, but REQUIRED can only mean one \
thing and should<br> not need second guessing the documentation. Sadly, someone \
thought otherwise.<br></blockquote><div><br></div><div>I guess there is no one to \
blame here.</div><div>The doc is too-realistic about the state of find \
modules.</div><div>At least Config mode should do it right I hope.</div><div>Module \
mode is historically for hand-written module maintained by volunteers:  <a \
href="https://gitlab.kitware.com/cmake/community/wikis/doc/cmake/dev/Module-Maintainer \
s">https://gitlab.kitware.com/cmake/community/wikis/doc/cmake/dev/Module-Maintainers</a></div><div><br></div><blockquote \
class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid \
rgb(204,204,204);padding-left:1ex"> &gt; Do you see this only with Qt or do other \
packages with components (may be Boost) behave like this?<br> &gt; I guess that Qt5 \
should be running in config mode, whereas boost must be in module mode though. <br> \
<br> I was debugging an older cmake project and wondered why it was not finding the \
non-standard Qt location, <br> that&#39;s when I stumbled upon this \
issue.<br></blockquote><div><br></div><div>I see. I think something could/should be \
done for Config mode, for Module mode It would certainly depends on the module \
maintainer.</div><div>  </div></div>-- <br><div dir="ltr" \
class="gmail_signature"><div dir="ltr"><div><div \
dir="ltr"><div>Eric<br></div></div></div></div></div></div>

-- 

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