meson: use project build root for doxygen output

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>

diff --git a/doc/doxygen/meson.build b/doc/doxygen/meson.build
index f2bee14..9f27ba8 100644 (file)
--- a/doc/doxygen/meson.build
+++ b/doc/doxygen/meson.build
@@ -13,7 +13,7 @@ dot_map = []
 
 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',