Add a depends: keyword to windows.compile_resources()

Expose depends: from the custom_target this creates.

docs/markdown/Windows-module.md

@@ -16,6 +16,8 @@ has the following keyword argument.
 - `depend_files` lists resource files that the resource script depends on
   (e.g. bitmap, cursor, font, html, icon, message table, binary data or manifest
   files referenced by the resource script) (*since 0.47.0*)
+- `depends` lists target(s) that this target depends on, even though it does not
+  take them as an argument (e.g. as above, but generated) (*since 0.47.0*)
 - `include_directories` lists directories to be both searched by the resource
   compiler for referenced resource files, and added to the preprocessor include
   search path.

docs/markdown/snippets/windows-resources-dependencies.md

@@ -1,7 +1,7 @@
 ## Windows resource files dependencies
 
 The `compile_resources()` function of the `windows` module now takes
-the `depend_files:` keyword.
+the `depend_files:` and `depends:` keywords.
 
 When using binutils's `windres`, dependencies on files `#include`'d by the
 preprocessor are now automatically tracked.

mesonbuild/modules/windows.py

@@ -30,13 +30,14 @@ class WindowsModule(ExtensionModule):
                 return compilers[l]
         raise MesonException('Resource compilation requires a C or C++ compiler.')
 
-    @FeatureNewKwargs('windows.compile_resources', '0.47.0', ['depend_files'])
-    @permittedKwargs({'args', 'include_directories', 'depend_files'})
+    @FeatureNewKwargs('windows.compile_resources', '0.47.0', ['depend_files', 'depends'])
+    @permittedKwargs({'args', 'include_directories', 'depend_files', 'depends'})
     def compile_resources(self, state, args, kwargs):
         comp = self.detect_compiler(state.compilers)
 
         extra_args = mesonlib.stringlistify(kwargs.get('args', []))
-        wrc_deps = extract_as_list(kwargs, 'depend_files', pop = True)
+        wrc_depend_files = extract_as_list(kwargs, 'depend_files', pop = True)
+        wrc_depends = extract_as_list(kwargs, 'depends', pop = True)
         inc_dirs = extract_as_list(kwargs, 'include_directories', pop = True)
         for incd in inc_dirs:
             if not isinstance(incd.held_object, (str, build.IncludeDirs)):
@@ -85,7 +86,8 @@ class WindowsModule(ExtensionModule):
                 'output': '@BASENAME@.' + suffix,
                 'input': [src],
                 'command': [rescomp] + res_args,
-                'depend_files': wrc_deps,
+                'depend_files': wrc_depend_files,
+                'depends': wrc_depends,
             }
 
             if isinstance(src, str):