FeatureNew: Make all checks subproject-specific

We now pass the current subproject to every FeatureNew and
FeatureDeprecated call. This requires a bunch of rework to:

1. Ensure that we have access to the subproject in the list of
   arguments when used as a decorator (see _get_callee_args).
2. Pass the subproject to .use() when it's called manually.
3. We also can't do feature checks for new features in
   meson_options.txt because that's parsed before we know the
   meson_version from project()

1 files changed, 2 insertions, 2 deletions

diff --git a/mesonbuild/modules/pkgconfig.py b/mesonbuild/modules/pkgconfig.py
index 63d1109..8684864 100644
--- a/mesonbuild/modules/pkgconfig.py
+++ b/mesonbuild/modules/pkgconfig.py
@@ -313,14 +313,14 @@ class PkgConfigModule(ExtensionModule):
                       'install_dir', 'extra_cflags', 'variables', 'url', 'd_module_versions'})
     def generate(self, state, args, kwargs):
         if 'variables' in kwargs:
-            FeatureNew('custom pkgconfig variables', '0.41.0').use()
+            FeatureNew('custom pkgconfig variables', '0.41.0').use(state.subproject)
         default_version = state.project_version['version']
         default_install_dir = None
         default_description = None
         default_name = None
         mainlib = None
         if len(args) == 1:
-            FeatureNew('pkgconfig.generate optional positional argument', '0.46.0').use()
+            FeatureNew('pkgconfig.generate optional positional argument', '0.46.0').use(state.subproject)
             mainlib = getattr(args[0], 'held_object', args[0])
             if not isinstance(mainlib, (build.StaticLibrary, build.SharedLibrary)):
                 raise mesonlib.MesonException('Pkgconfig_gen first positional argument must be a library object')