llvm-build: Don't write out the required_libraries list for "special" components, it is generated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146435 91177308-0d34-0410-b5e6-96231b3b80d8

Author: ddunbar

utils/llvm-build/llvmbuild/componentinfo.py

@@ -45,6 +45,10 @@ def __init__(self, subpath, name, dependencies, parent):
         # The original source path.
         self._source_path = None
 
+        # A flag to mark "special" components which have some amount of magic
+        # handling (generally based on command line options).
+        self._is_special_group = False
+
     def set_parent_instance(self, parent):
         assert parent.name == self.parent, "Unexpected parent!"
         self.parent_instance = parent
@@ -197,7 +201,7 @@ def get_llvmbuild_fragment(self):
         print >>result, 'type = %s' % self.type_name
         print >>result, 'name = %s' % self.name
         print >>result, 'parent = %s' % self.parent
-        if self.required_libraries:
+        if self.required_libraries and not self._is_special_group:
             print >>result, 'required_libraries = %s' % ' '.join(
                 self.required_libraries)
         if self.add_to_library_groups:

utils/llvm-build/llvmbuild/main.py

@@ -666,6 +666,7 @@ def find_special_group(name):
             fatal("special component %r must have empty %r list" % (
                     name, 'add_to_library_groups'))
 
+        info._is_special_group = True
         return info
 
     info_map = dict((ci.name, ci) for ci in project.component_infos)