meson.build_root() returns the parent's build directory if Wayland is
a subproject. This fails with:
error: tag OUTPUT_DIRECTORY: Output directory '<parent-build-dir>/doc/doxygen' does not exist and cannot be created
Instead, use meson.project_build_root(), which returns the subproject's
build directory.
Signed-off-by: Simon Ser <contact@emersion.fr>
doxygen_conf = configuration_data()
doxygen_conf.set('VERSION', meson.project_version())
-doxygen_conf.set('top_builddir', meson.build_root())
+doxygen_conf.set('top_builddir', meson.project_build_root())
wayland_doxygen = configure_file(
input: 'wayland.doxygen.in',
output: 'wayland.doxygen',