Find 'include' files from *not* meson project

[MartinSchwarzbauer]

Hi *!

We have the following situation.
I have to find some include files from a "parallel project" => linux drivers! This project is not a "meson project".

I tried the following solution:

# find driver
compiler = meson.get_compiler('c')
driver_inc = ''
if compiler.has_header('drv/myheader.h')
    message('Driver found in sysroot')
elif compiler.has_header('drv/myheader.h', include_directories: include_directories('../driver/inc') )
    driver_inc = '../driver/inc'
    message('Driver found in dependencies/driver/inc')
else
    assert(false, 'Driver not found')
endif

This worked as expected ---- BUT when i use this project as a dependency to an other project I get a lot of info and warnings:

meson.build:67: WARNING: include_directories sandbox violation!
The project is trying to access the directory './dependencies/driver/inc' which belongs to a different
subproject. This is a problem as it hardcodes the relative paths of these two projects.
This makes it impossible to compile the project in any other directory layout and also
prevents the subproject from changing its own directory layout.

Instead of poking directly at the internals the subproject should be executed and
it should set a variable that the caller can then use. Something like:

How can I use the includes from local project, also when this one is used as a subproject? I wanna fix this warning, because in future releases this will be an error!

Thank you so much,
Martin

[eli-schwartz]

It sounds like your project structure is:

.
├── drivers-project
└── myproject

And potentially:

.
└── otherproject
    └── subprojects
        ├── drivers-project
        └── myproject

I would suggest making drivers-project into a "wrapped" meson project. Give it a really simple meson.build that simply produces a

drivers_dep = declare_dependency(include_directories: ['inc'])

and you can get it with drivers_dep = subproject('drivers-project').get_variable('drivers_dep') and use it as a dependency in elif compiler.has_header('drv/myheader.h', dependencies: drivers_dep).

[MartinSchwarzbauer]

Thank you very much! It's working for our project!