How to override CMAKE_FIND_ROOT_PATH

[Richard Shaw]

I have a CMake project where I'm building wxWidgets on the fly. The
libraries are in a subdirectory of the build directory.

Unfortunately the CMAKE_FIND_ROOT_PATH gets prepended to the library name
even though it's being provided as an absolute directory rather than a
relative one.

From running cmake --debug-find:

find_library considered the following locations:

/usr/x86_64-w64-mingw32/sys-root/mingw/home/build/build/freedv/external/dist/lib/(lib|)wxregexu-3.1-x86_64-w64-mingw32(.dll|.dll.a|.a|.lib)

Obviously this is wrong. It should be using the
path, /home/build/build/freedv/external/dist/lib, directly without
prepending anything.

Help!

Thanks,
Richard

[Sandro Mani]

Hi Richard

You can pass NO_CMAKE_FIND_ROOT_PATH to FIND_FILE if that's where the 
problem arises, i.e. in an project I have

FIND_FILE(_find_pyqt5_py FindPyQt5.py PATHS ${CMAKE_MODULE_PATH} 
NO_CMAKE_FIND_ROOT_PATH)

Best
Sandro

On 13.08.20 23:05, Richard Shaw wrote:
> I have a CMake project where I'm building wxWidgets on the fly. The 
> libraries are in a subdirectory of the build directory.
>
> Unfortunately the CMAKE_FIND_ROOT_PATH gets prepended to the library 
> name even though it's being provided as an absolute directory rather 
> than a relative one.
>
> From running cmake --debug-find:
>
> find_library considered the following locations:
>
> /usr/x86_64-w64-mingw32/sys-root/mingw/home/build/build/freedv/external/dist/lib/(lib|)wxregexu-3.1-x86_64-w64-mingw32(.dll|.dll.a|.a|.lib)
>
> Obviously this is wrong. It should be using the 
> path, /home/build/build/freedv/external/dist/lib, directly without 
> prepending anything.
>
> Help!
>
> Thanks,
> Richard
>
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[Richard Shaw]

On Thu, Aug 13, 2020 at 4:58 PM Sandro Mani  wrote:
> Hi Richard
>
> You can pass NO_CMAKE_FIND_ROOT_PATH to FIND_FILE if that's where the
> problem arises, i.e. in an project I have
>
> FIND_FILE(_find_pyqt5_py FindPyQt5.py PATHS ${CMAKE_MODULE_PATH}
> NO_CMAKE_FIND_ROOT_PATH)

That works if it's my CMake file, but this is using the system
FindwxWidgets module.

Thanks,
Richard

[Richard Shaw]

Since CMAKE_FIND_ROOT_PATH can be a list (not just a single path) I did a
list(APPEND CMAKE_FIND_ROOT_PATH "/") and that fixed it for me.

Thanks,
Richard
>