vs2010: fix object extraction

1. Dependencies must be set up with the target's id instead of its
basename.
2. Extracted object output file names must not include the directory
prefix, because MSBuild puts all object files into the same directory
and names them srcfilename.obj instead of dir/filename.obj or
dir_filename.obj.

mesonbuild/backend/backends.py

@@ -142,7 +142,7 @@ class Backend():
         return os.path.relpath(os.path.join('dummyprefixdir', todir),\
                                os.path.join('dummyprefixdir', fromdir))
 
-    def flatten_object_list(self, target, proj_dir_to_build_root=''):
+    def flatten_object_list(self, target, proj_dir_to_build_root='', include_dir_names=True):
         obj_list = []
         for obj in target.get_objects():
             if isinstance(obj, str):
@@ -150,7 +150,7 @@ class Backend():
                                  self.build_to_src, target.get_subdir(), obj)
                 obj_list.append(o)
             elif isinstance(obj, build.ExtractedObjects):
-                obj_list += self.determine_ext_objs(obj, proj_dir_to_build_root)
+                obj_list += self.determine_ext_objs(obj, proj_dir_to_build_root, include_dir_names)
             else:
                 raise MesonException('Unknown data type in object list.')
         return obj_list
@@ -207,7 +207,7 @@ class Backend():
                 return c
         raise RuntimeError('Unreachable code')
 
-    def determine_ext_objs(self, extobj, proj_dir_to_build_root=''):
+    def determine_ext_objs(self, extobj, proj_dir_to_build_root='', include_dir_names=True):
         result = []
         targetdir = self.get_target_private_dir(extobj.target)
         suffix = '.' + self.environment.get_object_suffix()
@@ -221,7 +221,12 @@ class Backend():
             if pathsegs[0] == 'subprojects':
                 pathsegs = pathsegs[2:]
             fixedpath = os.sep.join(pathsegs)
-            objbase = osrc.fname.replace('/', '_').replace('\\', '_')
+            if include_dir_names:
+                objbase = osrc_base.replace('/', '_').replace('\\', '_')
+            else:
+                # vs2010 backend puts all obj files without directory prefixes into build dir, so just
+                # use the file name without a directory (will be stripped by os.path.basename() below).
+                objbase = osrc_base
             objname = os.path.join(proj_dir_to_build_root,
                                    targetdir, os.path.basename(objbase) + suffix)
             result.append(objname)

mesonbuild/backend/vs2010backend.py

@@ -36,7 +36,7 @@ class Vs2010Backend(backends.Backend):
         super().__init__(build)
         self.project_file_version = '10.0.30319.1'
         # foo.c compiles to foo.obj, not foo.c.obj
-        self.source_suffix_in_obj = False
+        self.source_suffix_in_objs = False
 
     def generate_custom_generator_commands(self, target, parent_node):
         all_output_files = []
@@ -116,7 +116,7 @@ class Vs2010Backend(backends.Backend):
         result = {}
         for o in obj_list:
             if isinstance(o, build.ExtractedObjects):
-                result[o.target.get_basename()] = True
+                result[o.target.get_id()] = True
         return result.keys()
 
     def determine_deps(self, p):
@@ -492,7 +492,7 @@ class Vs2010Backend(backends.Backend):
             rel_path = self.relpath(lobj.subdir, target.subdir)
             linkname = os.path.join(rel_path, lobj.get_import_filename())
             additional_links.append(linkname)
-        for o in self.flatten_object_list(target, down):
+        for o in self.flatten_object_list(target, down, include_dir_names=False):
             assert(isinstance(o, str))
             additional_links.append(o)
         if len(additional_links) > 0: