1 files changed, 43 insertions, 0 deletions
diff --git a/make/subdir.mk b/make/subdir.mk
new file mode 100644
index 000000000..3aea16c73
--- /dev/null
+++ b/make/subdir.mk
@@ -0,0 +1,43 @@
+# This file is intended to be included from each subdirectory
+# makefile.
+
+ifeq ($(Dir),)
+  $(error "No Dir variable defined.")
+endif
+
+ifeq ($(DebugMake),1)
+  $(info MAKE: $(Dir): Processing subdirectory)
+endif
+
+# Expand template for each configuration and architecture.
+# FIXME: This level of logic should be in primary Makefile?
+ifeq ($(OnlyConfigs),)
+  ConfigsToTraverse := $(Configs)
+else
+  ConfigsToTraverse := $(OnlyConfigs)
+endif
+
+ifeq ($(OnlyArchs),)
+  ArchsToTraverse := $(Archs)
+else
+  ArchsToTraverse := $(OnlyArchs)
+endif
+
+$(foreach config,$(ConfigsToTraverse), \
+  $(foreach arch,$(ArchsToTraverse), \
+    $(eval $(call CNA_subdir_template,$(config),$(arch),$(Dir)))))
+
+###
+# Include child makefile fragments
+
+# Evaluate this now so we do not have to worry about order of
+# evaluation.
+SubDirsList := $(SubDirs:%=$(Dir)/%)
+ifeq ($(SubDirsList),)
+else
+  ifeq ($(DebugMake),1)
+    $(info MAKE: Descending into subdirs: $(SubDirsList))
+  endif
+  $(foreach subdir,$(SubDirsList),$(eval include $(subdir)/Makefile.mk))
+endif
+