Bug 1573566 - Don't make HostRustLibrary indirectly inherit from StaticLibrary. r=froydnj

So that isinstance(foo, StaticLibrary) doesn't end up being true for
HostRustLibrary. Instead, it now inherits from HostLibrary.

Differential Revision: https://phabricator.services.mozilla.com/D42248

--HG--
extra : moz-landing-system : lando

python/mozbuild/mozbuild/backend/common.py

@@ -32,6 +32,7 @@ from mozbuild.frontend.data import (
     GeneratedSources,
     GnProjectData,
     HostLibrary,
+    HostRustLibrary,
     HostGeneratedSources,
     IPDLCollection,
     LocalizedPreprocessedFiles,
@@ -276,7 +277,7 @@ class CommonBackend(BuildBackend):
 
         system_libs = not isinstance(input_bin, (HostLibrary, StaticLibrary))
         for lib in input_bin.linked_libraries:
-            if isinstance(lib, RustLibrary):
+            if isinstance(lib, (HostRustLibrary, RustLibrary)):
                 continue
             elif isinstance(lib, (HostLibrary, StaticLibrary)):
                 expand(lib, True, system_libs)

python/mozbuild/mozbuild/backend/recursivemake.py

@@ -46,6 +46,7 @@ from ..frontend.data import (
     HostGeneratedSources,
     HostLibrary,
     HostProgram,
+    HostRustLibrary,
     HostRustProgram,
     HostSimpleProgram,
     HostSources,
@@ -678,7 +679,7 @@ class RecursiveMakeBackend(CommonBackend):
         elif isinstance(obj, InstallationTarget):
             self._process_installation_target(obj, backend_file)
 
-        elif isinstance(obj, RustLibrary):
+        elif isinstance(obj, (RustLibrary, HostRustLibrary)):
             self.backend_input_files.add(obj.cargo_file)
             self._process_rust_library(obj, backend_file)
             # No need to call _process_linked_libraries, because Rust

python/mozbuild/mozbuild/frontend/data.py

@@ -670,9 +670,8 @@ class StaticLibrary(Library):
         self.no_expand_lib = no_expand_lib
 
 
-class RustLibrary(StaticLibrary):
-    """Context derived container object for a static library"""
-    __slots__ = (
+class BaseRustLibrary(object):
+    slots = (
         'cargo_file',
         'crate_type',
         'dependencies',
@@ -681,13 +680,9 @@ class RustLibrary(StaticLibrary):
         'target_dir',
         'output_category',
     )
-    TARGET_SUBST_VAR = 'RUST_TARGET'
-    FEATURES_VAR = 'RUST_LIBRARY_FEATURES'
-    LIB_FILE_VAR = 'RUST_LIBRARY_FILE'
 
-    def __init__(self, context, basename, cargo_file, crate_type, dependencies,
-                 features, target_dir, **args):
-        StaticLibrary.__init__(self, context, basename, **args)
+    def init(self, context, basename, cargo_file, crate_type, dependencies,
+             features, target_dir):
         self.cargo_file = cargo_file
         self.crate_type = crate_type
         # We need to adjust our naming here because cargo replaces '-' in
@@ -715,6 +710,21 @@ class RustLibrary(StaticLibrary):
         self.deps_path = mozpath.join(build_dir, 'deps')
 
 
+class RustLibrary(StaticLibrary, BaseRustLibrary):
+    """Context derived container object for a rust static library"""
+    KIND = 'target'
+    TARGET_SUBST_VAR = 'RUST_TARGET'
+    FEATURES_VAR = 'RUST_LIBRARY_FEATURES'
+    LIB_FILE_VAR = 'RUST_LIBRARY_FILE'
+    __slots__ = BaseRustLibrary.slots
+
+    def __init__(self, context, basename, cargo_file, crate_type, dependencies,
+                 features, target_dir, link_into=None):
+        StaticLibrary.__init__(self, context, basename, link_into=link_into)
+        BaseRustLibrary.init(self, context, basename, cargo_file,
+                             crate_type, dependencies, features, target_dir)
+
+
 class SharedLibrary(Library):
     """Context derived container object for a shared library"""
     __slots__ = (
@@ -830,12 +840,19 @@ class HostLibrary(HostMixin, BaseLibrary):
     KIND = 'host'
 
 
-class HostRustLibrary(HostMixin, RustLibrary):
+class HostRustLibrary(HostLibrary, BaseRustLibrary):
     """Context derived container object for a host rust library"""
     KIND = 'host'
     TARGET_SUBST_VAR = 'RUST_HOST_TARGET'
     FEATURES_VAR = 'HOST_RUST_LIBRARY_FEATURES'
     LIB_FILE_VAR = 'HOST_RUST_LIBRARY_FILE'
+    __slots__ = BaseRustLibrary.slots
+
+    def __init__(self, context, basename, cargo_file, crate_type, dependencies,
+                 features, target_dir):
+        HostLibrary.__init__(self, context, basename)
+        BaseRustLibrary.init(self, context, basename, cargo_file,
+                             crate_type, dependencies, features, target_dir)
 
 
 class TestManifest(ContextDerived):