vs2010: add object files from custom_target to project

Object files from a custom_target are like external objects and must be
added to the project.
Object files from a generator are automatically used by MSBuild, since they
are part of the CustomBuildStep and thus part of the same project as the
current build target.

mesonbuild/backend/vs2010backend.py

@@ -69,14 +69,15 @@ class Vs2010Backend(backends.Backend):
                                                        if len(src_conflicts) > 1}
 
     def generate_custom_generator_commands(self, target, parent_node):
-        all_output_files = []
+        generator_output_files = []
         commands = []
         inputs = []
         outputs = []
         custom_target_include_dirs = []
+        custom_target_output_files = []
         for genlist in target.get_generated_sources():
             if isinstance(genlist, build.CustomTarget):
-                all_output_files += [os.path.join(self.get_target_dir(genlist), i) for i in genlist.output]
+                custom_target_output_files += [os.path.join(self.get_target_dir(genlist), i) for i in genlist.output]
                 idir = self.relpath(self.get_target_dir(genlist), self.get_target_dir(target))
                 if idir not in custom_target_include_dirs:
                     custom_target_include_dirs.append(idir)
@@ -97,7 +98,7 @@ class Vs2010Backend(backends.Backend):
                     infilename = os.path.join(self.environment.get_source_dir(), curfile)
                     outfiles = genlist.get_outputs_for(curfile)
                     outfiles = [os.path.join(target_private_dir, of) for of in outfiles]
-                    all_output_files += outfiles
+                    generator_output_files += outfiles
                     args = [x.replace("@INPUT@", infilename).replace('@OUTPUT@', sole_output)\
                             for x in base_args]
                     args = [x.replace("@SOURCE_DIR@", self.environment.get_source_dir()).replace("@BUILD_DIR@", target_private_dir)
@@ -115,7 +116,7 @@ class Vs2010Backend(backends.Backend):
             ET.SubElement(cbs, 'Message').text = 'Generating custom sources.'
             pg = ET.SubElement(parent_node, 'PropertyGroup')
             ET.SubElement(pg, 'CustomBuildBeforeTargets').text = 'ClCompile'
-        return all_output_files, custom_target_include_dirs
+        return generator_output_files, custom_target_output_files, custom_target_include_dirs
 
     def generate(self, interp):
         self.resolve_source_conflicts()
@@ -442,8 +443,12 @@ class Vs2010Backend(backends.Backend):
         ET.SubElement(type_config, 'WholeProgramOptimization').text = 'false'
         ET.SubElement(type_config, 'UseDebugLibraries').text = 'true'
         ET.SubElement(root, 'Import', Project='$(VCTargetsPath)\Microsoft.Cpp.props')
-        generated_files, generated_files_include_dirs = self.generate_custom_generator_commands(target, root)
+        generated_files, custom_target_output_files, generated_files_include_dirs = self.generate_custom_generator_commands(target, root)
         (gen_src, gen_hdrs, gen_objs, gen_langs) = self.split_sources(generated_files)
+        (custom_src, custom_hdrs, custom_objs, custom_langs) = self.split_sources(custom_target_output_files)
+        gen_src += custom_src
+        gen_hdrs += custom_hdrs
+        gen_langs += custom_langs
         direlem = ET.SubElement(root, 'PropertyGroup')
         fver = ET.SubElement(direlem, '_ProjectFileVersion')
         fver.text = self.project_file_version
@@ -573,6 +578,8 @@ class Vs2010Backend(backends.Backend):
         for o in self.flatten_object_list(target, down):
             assert(isinstance(o, str))
             additional_objects.append(o)
+        for o in custom_objs:
+            additional_objects.append(self.relpath(o, self.get_target_dir(target)))
         if len(additional_links) > 0:
             additional_links.append('%(AdditionalDependencies)')
             ET.SubElement(link, 'AdditionalDependencies').text = ';'.join(additional_links)