[CMake] Proper way to find system copy of libxml2 on macOS

[Eric Noulard]

2016-10-12 17:28 GMT+02:00 Konstantin Tokarev <annulen at yandex.ru>:

> Hello,
>
> In my cmake project I need to use system version of libxml2 on macOS
> (/usr/lib/libxml2.dylib), however in case it is installed in MacPorts the
> latter version is picked by find_package. On the other hand I'd like to
> avoid hardcoding absolute path, just in case Apple changes some path or
> file name in future OS version.
>
> I've tried
>
> find_package(LibXml2 2.8.0 REQUIRED PATHS "/usr" NO_DEFAULT_PATH)
>
> however it fails to find anything at all. Any ideas?
>

My guess is that your find_package call end up in "Module mode"  because
there is a FindLibXml2.cmake module bundled with cmake does not honor all
options of the find_package when in this mode.

So I bet FindLibXml2.cmake does not handle the given
"PATHS "/usr" NO_DEFAULT_PATH" part.

Which are handled by find_package when running in "Config mode".

I suggest you to try patch and update the FindLibXml2.cmake module.
Or simply craft your own

find_library(...) call.if you only need the libxml2.
Eric


> --
> Regards,
> Konstantin
> --
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-- 
Eric
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