windows: Add support for Zig's builtin rc compiler

docs/markdown/snippets/zig-rc.md

@@ -0,0 +1,7 @@
+## Added support for Zig's builtin Windows Resource Compiler
+
+Using `zig rc` as `windres` no longer triggers the error `Could not determine
+type of Windows resource compiler`.
+
+Note: Zig 0.14.1 and later have modified their CLI for Meson compatibility, so
+this change is only relevant when using `zig rc` versions earlier than 0.14.1.

mesonbuild/modules/windows.py

@@ -86,6 +86,7 @@ def _find_resource_compiler(self, state: 'ModuleState') -> T.Tuple[ExternalProgr
             raise MesonException('Could not find Windows resource compiler')
 
         for (arg, match, rc_type) in [
+                # Zig >=0.14.1 is also matched by the regex below.
                 ('/?', '^.*Microsoft.*Resource Compiler.*$', ResourceCompilerType.rc),
                 ('/?', 'LLVM Resource Converter.*$', ResourceCompilerType.rc),
                 ('--version', '^.*GNU windres.*$', ResourceCompilerType.windres),
@@ -98,7 +99,15 @@ def _find_resource_compiler(self, state: 'ModuleState') -> T.Tuple[ExternalProgr
                 self._rescomp = (rescomp, rc_type)
                 break
         else:
-            raise MesonException('Could not determine type of Windows resource compiler')
+            # Zig <0.14.1 prints its info to stderr, so we'll handle it separately.
+            _, _, e = mesonlib.Popen_safe(rescomp.get_command() + ['/?'])
+            # The string below should be indicative of a resinator rc compiler
+            # (which includes zig rc).
+            if re.search('^Supported Win32 RC Options:$', e, re.MULTILINE):
+                mlog.log('Windows resource compiler: Zig <0.14.1/restinator Resource Compiler')
+                self._rescomp = (rescomp, ResourceCompilerType.rc)
+            else:
+                raise MesonException('Could not determine type of Windows resource compiler')
 
         return self._rescomp