Allow libqemu to be built outside of CPM.

[benoitdudu]

Hello,

I tried to build Qbox by compiling libqemu outside CPM.
To do that I set the following environment variables:
export CPM_USE_LOCAL_PACKAGES=ON
export libqemu_ROOT=/lib64/cmake/libqemu'

Unfortunately, it currently fails to compile (an include error occurred in this case). To resolve this issue, I updated the Qbox CMakeLists.txt file.

Best Regards,
Benoît

[Marco Liebel (quic-mliebel)]

Hey Benoît,

CPM has a way to override dependency sources: https://github.com/cpm-cmake/CPM.cmake#local-package-override

For libqemu it would be -D CPM_libqemu_SOURCE=/foo/bar

Did you try that already?

[benoitdudu]

Hi Marco,

Thanks for reminding me of this possibility, I had not actually tried that.
In my case, I already need (I actually did not find another solution) to use CPM_USE_LOCAL_PACKAGES=ON for the SystemC library, as I need to use the version provided by my EDA vendor.

Anyway, I tried my modification with the 3 cases:

• current build flow
• set CPM_USE_LOCAL_PACKAGES=ON and libqemu_ROOT
• set CPM_libqemu_SOURCE

All of them are OK.