cmake: Fix blunt target filtering skipping GENERATED dependencies

GENERATED files can be used as dependencies for other targets, so it's
misguided (at best) to filter them with a blunt whitelist.

However, there does exist an extension that needs to be skipped: on Windows +
MSVC, CMake will by default try to generate a Visual Studio project, and
there dependencies with no inputs are instead tied to a dummy .rule
input file which is created by the generation step. The fileapi will
still report those, so it will cause Meson to bail out when it realises
there's no such file in the build tree.

Fixes #11607

1 files changed, 9 insertions, 1 deletions

diff --git a/mesonbuild/cmake/interpreter.py b/mesonbuild/cmake/interpreter.py
index 14e15b8fd..68cbea497 100644
--- a/mesonbuild/cmake/interpreter.py
+++ b/mesonbuild/cmake/interpreter.py
@@ -362,7 +362,15 @@ class ConverterTarget:
             supported += list(lang_suffixes[i])
         supported = [f'.{x}' for x in supported]
         self.sources = [x for x in self.sources if any(x.name.endswith(y) for y in supported)]
-        self.generated_raw = [x for x in self.generated_raw if any(x.name.endswith(y) for y in supported)]
+        # Don't filter unsupported files from generated_raw because they
+        # can be GENERATED dependencies for other targets.
+        # See: https://github.com/mesonbuild/meson/issues/11607
+        # However, the dummy CMake rule files for Visual Studio still
+        # need to be filtered out. They don't exist (because the project was
+        # not generated at this time) but the fileapi will still
+        # report them on Windows.
+        # See: https://stackoverflow.com/a/41816323
+        self.generated_raw = [x for x in self.generated_raw if not x.name.endswith('.rule')]
 
         # Make paths relative
         def rel_path(x: Path, is_header: bool, is_generated: bool) -> T.Optional[Path]: