waf: use git_submodule tool through GIT_SUBMODULES variable

With this change, there's no need to verify if the submodule is initialized,
because the submodules in GIT_SUBMODULES are automatically initialized and
updated if necessary before the build tasks are performed.

One downside of this change is that Google Benchmark configuration is now done
only during build. However that is minor, since now there are easy ways to
separately build different targets and program groups, so that a fail in
benchmark build doesn't really affect the other targets.

Tools/ardupilotwaf/gbenchmark.py

@@ -49,13 +49,6 @@ def configure(cfg):
         )
         return
 
-    cfg.start_msg('Checking for gbenchmark submodule')
-    cmake_lists = cfg.srcnode.find_resource('modules/gbenchmark/CMakeLists.txt')
-    if not cmake_lists:
-        cfg.end_msg('not initialized', color='YELLOW')
-        return
-    cfg.end_msg('yes')
-
     cfg.find_program('cmake', mandatory=False)
 
     if not env.CMAKE:
@@ -74,25 +67,18 @@ def configure(cfg):
     bldnode = cfg.bldnode.make_node(cfg.variant)
     prefix_node = bldnode.make_node('gbenchmark')
     my_build_node = bldnode.make_node('gbenchmark_build')
-    my_src_node = cfg.srcnode.find_dir('modules/gbenchmark')
+    my_src_node = cfg.srcnode.make_node('modules/gbenchmark')
 
     env.GBENCHMARK_PREFIX_REL = prefix_node.path_from(bldnode)
     env.GBENCHMARK_BUILD = my_build_node.abspath()
     env.GBENCHMARK_BUILD_REL = my_build_node.path_from(bldnode)
     env.GBENCHMARK_SRC = my_src_node.abspath()
 
-    cfg.start_msg('Configuring gbenchmark')
-    try:
-        _configure_cmake(cfg, bldnode)
-        cfg.end_msg('done')
-    except:
-        cfg.end_msg('failed', color='YELLOW')
-        return
-
     env.INCLUDES_GBENCHMARK = [prefix_node.make_node('include').abspath()]
     env.LIBPATH_GBENCHMARK = [prefix_node.make_node('lib').abspath()]
     env.LIB_GBENCHMARK = ['benchmark']
 
+    env.append_value('GIT_SUBMODULES', 'gbenchmark')
     env.HAS_GBENCHMARK = True
 
 class gbenchmark_build(Task.Task):
@@ -116,10 +102,6 @@ class gbenchmark_build(Task.Task):
         bld = self.generator.bld
         cmds = []
 
-        cmake_lists = bld.srcnode.find_resource('modules/gbenchmark/CMakeLists.txt')
-        if not cmake_lists:
-            bld.fatal('Submodule gbenchmark not initialized, please run configure again')
-
         try:
             # Generate build system first, if necessary
             my_build_node = bld.bldnode.find_dir(self.env.GBENCHMARK_BUILD_REL)

Tools/ardupilotwaf/gtest.py

@@ -20,13 +20,7 @@ def configure(cfg):
         )
         return
 
-    cfg.start_msg('Checking for gtest submodule')
-    readme = cfg.srcnode.find_resource('modules/gtest/README')
-    if not readme:
-        cfg.end_msg('not initialized', color='YELLOW')
-        return
-    cfg.end_msg('yes')
-
+    cfg.env.append_value('GIT_SUBMODULES', 'gtest')
     cfg.env.HAS_GTEST = True
 
 @conf

Tools/ardupilotwaf/mavgen.py

@@ -53,11 +53,5 @@ def configure(cfg):
 
     env = cfg.env
 
-    cfg.start_msg('Checking for mavgen')
-    if not cfg.srcnode.find_resource('modules/mavlink/pymavlink/tools/mavgen.py'):
-        cfg.fatal('not found, please run: git submodule init && git submodule update')
-        return
-    cfg.end_msg('yes')
-
-    env.MAVLINK_DIR = cfg.srcnode.find_dir('modules/mavlink/').abspath()
+    env.MAVLINK_DIR = cfg.srcnode.make_node('modules/mavlink/').abspath()
     env.MAVGEN = env.MAVLINK_DIR  + '/pymavlink/tools/mavgen.py'

wscript

@@ -97,6 +97,8 @@ def configure(cfg):
     else:
         cfg.end_msg('disabled', color='YELLOW')
 
+    cfg.env.append_value('GIT_SUBMODULES', 'mavlink')
+
     cfg.env.prepend_value('INCLUDES', [
         cfg.srcnode.abspath() + '/libraries/',
     ])