Populate INCLUDE_DIRS with some likely candidates.

Implement __EXPORT and such for modules, as well as symbol visibility.

Don't use UNZIP to point to unzip, as it looks there for arguments.

makefiles/module.mk

@@ -75,6 +75,12 @@
 #	the list should be formatted as: 
 #		<command>.<priority>.<stacksize>.<entrypoint>
 #
+# DEFAULT_VISIBILITY	(optional)
+#
+#	If not set, global symbols defined in a module will not be visible 
+#	outside the module. Symbols that should be globally visible must be
+#	marked __EXPORT.
+#	If set, global symbols defined in a module will be globally visible.
 #
 
 #
@@ -98,11 +104,6 @@ $(error No module makefile specified)
 endif
 $(info %  MODULE_MK           = $(MODULE_MK))
 
-#
-# Get path and tool config
-#
-include $(PX4_BASE)/makefiles/setup.mk
-
 #
 # Get the board/toolchain config
 #
@@ -150,6 +151,19 @@ $(MODULE_COMMAND_FILES): $(GLOBAL_DEPS)
 	$(Q) $(TOUCH) $@
 endif
 
+################################################################################
+# Adjust compilation flags to implement EXPORT
+################################################################################
+
+ifeq ($(DEFAULT_VISIBILITY),)
+DEFAULT_VISIBILITY = hidden
+else
+DEFAULT_VISIBILITY = default
+endif
+
+CFLAGS		+= -fvisibility=$(DEFAULT_VISIBILITY) -include $(PX4_INCLUDE_DIR)visibility.h
+CXXFLAGS	+= -fvisibility=$(DEFAULT_VISIBILITY) -include $(PX4_INCLUDE_DIR)visibility.h
+
 ################################################################################
 # Build rules
 ################################################################################

makefiles/nuttx.mk

@@ -71,5 +71,5 @@ LINK_DEPS		+= $(NUTTX_EXPORT_DIR)libs/libapps.a \
 
 $(NUTTX_CONFIG_HEADER):	$(NUTTX_ARCHIVE)
 	@$(ECHO) %% Unpacking $(NUTTX_ARCHIVE)
-	$(Q) $(UNZIP) -q -o -d $(WORK_DIR) $(NUTTX_ARCHIVE)
+	$(Q) $(UNZIP_CMD) -q -o -d $(WORK_DIR) $(NUTTX_ARCHIVE)
 	$(Q) $(TOUCH) $@

makefiles/setup.mk

@@ -41,6 +41,7 @@
 # the number of duplicate slashes we have lying around in paths,
 # and is consistent with joining the results of $(dir) and $(notdir).
 #
+export PX4_INCLUDE_DIR	 = $(abspath $(PX4_BASE)/src/include)/
 export PX4_MODULE_SRC	 = $(abspath $(PX4_BASE)/src/modules)/
 export PX4_MK_DIR	 = $(abspath $(PX4_BASE)/makefiles)/
 export NUTTX_SRC	 = $(abspath $(PX4_BASE)/nuttx)/
@@ -51,24 +52,33 @@ export IMAGE_DIR	 = $(abspath $(PX4_BASE)/Images)/
 export BUILD_DIR	 = $(abspath $(PX4_BASE)/Build)/
 export ARCHIVE_DIR	 = $(abspath $(PX4_BASE)/Archives)/
 
+#
+# Default include paths
+#
+export INCLUDE_DIRS	:= $(PX4_MODULE_SRC) \
+			   $(PX4_INCLUDE_DIR)
+
+# Include from legacy app/library path
+export INCLUDE_DIRS	+= $(NUTTX_APP_SRC)
+
 #
 # Tools
 #
-MKFW			 = $(PX4_BASE)/Tools/px_mkfw.py
-UPLOADER		 = $(PX4_BASE)/Tools/px_uploader.py
-COPY			 = cp
-REMOVE			 = rm -f
-RMDIR			 = rm -rf
-GENROMFS		 = genromfs
-TOUCH			 = touch
-MKDIR			 = mkdir
-ECHO			 = echo
-UNZIP			 = unzip
+export MKFW		 = $(PX4_BASE)/Tools/px_mkfw.py
+export UPLOADER		 = $(PX4_BASE)/Tools/px_uploader.py
+export COPY		 = cp
+export REMOVE		 = rm -f
+export RMDIR		 = rm -rf
+export GENROMFS		 = genromfs
+export TOUCH		 = touch
+export MKDIR		 = mkdir
+export ECHO		 = echo
+export UNZIP_CMD	 = unzip
 
 #
 # Host-specific paths, hacks and fixups
 #
-SYSTYPE			:= $(shell uname -s)
+export SYSTYPE		:= $(shell uname -s)
 
 ifeq ($(SYSTYPE),Darwin)
 # Eclipse may not have the toolchain on its path.