--- a/python/mozbuild/mozbuild/backend/recursivemake.py
+++ b/python/mozbuild/mozbuild/backend/recursivemake.py
@@ -515,26 +515,17 @@ class RecursiveMakeBackend(CommonBackend
                 else:
                     backend_file.write('%s := %s\n' % (k, v))
         elif isinstance(obj, HostDefines):
             self._process_defines(obj, backend_file, which='HOST_DEFINES')
         elif isinstance(obj, Defines):
             self._process_defines(obj, backend_file)
 
         elif isinstance(obj, GeneratedFile):
-            export_suffixes = (
-                '.c',
-                '.cpp',
-                '.h',
-                '.inc',
-                '.py',
-                '.rs',
-                'new', # 'new' is an output from make-stl-wrappers.py
-            )
-            tier = 'export' if any(f.endswith(export_suffixes) for f in obj.outputs) else 'misc'
+            tier = 'export' if obj.required_for_compile else 'misc'
             self._no_skip[tier].add(backend_file.relobjdir)
             first_output = obj.outputs[0]
             dep_file = "%s.pp" % first_output
 
             # If we're doing this during export that means we need it during
             # compile, but if we have an artifact build we don't run compile,
             # so we can skip it altogether or let the rule run as the result of
             # something depending on it.

--- a/python/mozbuild/mozbuild/backend/tup.py
+++ b/python/mozbuild/mozbuild/backend/tup.py
@@ -328,21 +328,16 @@ class TupOnly(CommonBackend, PartialBack
 
     def _process_generated_file(self, backend_file, obj):
         # TODO: These are directories that don't work in the tup backend
         # yet, because things they depend on aren't built yet.
         skip_directories = (
             'layout/style/test', # HostSimplePrograms
             'toolkit/library', # libxul.so
         )
-        install_exts = (
-            '.h',
-            '.inc',
-            'new', # 'new' is an output from make-stl-wrappers.py
-        )
         if obj.script and obj.method and obj.relobjdir not in skip_directories:
             backend_file.export_shell()
             cmd = self._py_action('file_generate')
             cmd.extend([
                 obj.script,
                 obj.method,
                 obj.outputs[0],
                 '%s.pp' % obj.outputs[0], # deps file required
@@ -350,17 +345,17 @@ class TupOnly(CommonBackend, PartialBack
             full_inputs = [f.full_path for f in obj.inputs]
             cmd.extend(full_inputs)
             cmd.extend(shell_quote(f) for f in obj.flags)
 
             outputs = []
             outputs.extend(obj.outputs)
             outputs.append('%s.pp' % obj.outputs[0])
 
-            extra_outputs = [self._installed_files] if any(f.endswith(install_exts) for f in obj.outputs) else None
+            extra_outputs = [self._installed_files] if obj.required_for_compile else None
 
             backend_file.rule(
                 display='python {script}:{method} -> [%o]'.format(script=obj.script, method=obj.method),
                 cmd=cmd,
                 inputs=full_inputs,
                 outputs=outputs,
                 extra_outputs=extra_outputs,
             )

--- a/python/mozbuild/mozbuild/frontend/data.py
+++ b/python/mozbuild/mozbuild/frontend/data.py
@@ -1051,26 +1051,38 @@ class GeneratedFile(ContextDerived):
     """Represents a generated file."""
 
     __slots__ = (
         'script',
         'method',
         'outputs',
         'inputs',
         'flags',
+        'required_for_compile',
     )
 
     def __init__(self, context, script, method, outputs, inputs, flags=()):
         ContextDerived.__init__(self, context)
         self.script = script
         self.method = method
         self.outputs = outputs if isinstance(outputs, tuple) else (outputs,)
         self.inputs = inputs
         self.flags = flags
 
+        suffixes = (
+            '.c',
+            '.cpp',
+            '.h',
+            '.inc',
+            '.py',
+            '.rs',
+            'new', # 'new' is an output from make-stl-wrappers.py
+        )
+        self.required_for_compile = any(f.endswith(suffixes) for f in self.outputs)
+
 
 class AndroidResDirs(ContextDerived):
     """Represents Android resource directories."""
 
     __slots__ = (
         'paths',
     )