fw/build: Allow applications to filter environments

We use an external python script to solve which env to build, to
mix board and app env list

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

src/target/firmware/Makefile

@@ -86,6 +86,11 @@ BOARD_se_j100_ENVIRONMENTS=$(compal_COMMON_ENVIRONMENTS)
 # List of all applications (meant to be overridden on command line)
 APPLICATIONS?=hello_world compal_dsp_dump layer1 loader chainload rssi
 
+# Applications specific env requirements
+APP_chainload_ENVIRONMENTS=compalram
+APP_loader_ENVIRONMENTS=compalram highram
+APP_rssi_ENVIRONMENTS=* -compalram
+
 # Various objects that are currently linked into all applications
 FLASH_OBJS=flash/cfi_flash.o
 ABB_OBJS=abb/twl3025.o

src/target/firmware/Makefile.inc

@@ -134,7 +134,7 @@ $(foreach app,$(APPLICATIONS), \
 
 $(foreach app,$(APPLICATIONS),                \
 	$(foreach brd,$(BOARDS),                  \
-		$(foreach env,$(BOARD_$(brd)_ENVIRONMENTS), \
+		$(foreach env,$(shell ./solve_envs.py "$(BOARD_$(brd)_ENVIRONMENTS)" "$(APP_$(app)_ENVIRONMENTS)"), \
 			$(eval $(call APPLICATION_BOARD_ENVIRONMENT_template,$(app),$(brd),$(env))))))
 
 

src/target/firmware/solve_envs.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+
+import sys
+
+def parse(s):
+	return set([x.strip() for x in s.split() if x.strip()])
+
+
+def solve(board_envs, app_envs):
+	if not app_envs:
+		return board_envs
+
+	envs = set()
+
+	if '*' in app_envs:
+		envs.update(board_envs)
+		app_envs.discard('*')
+
+	for e in app_envs:
+		if e.startswith('-'):
+			envs.discard(e[1:])
+		elif e in board_envs:
+			envs.add(e)
+
+	return envs
+
+
+def main(name, board_envs, app_envs):
+	# Parse args
+	board_envs = parse(board_envs)
+	app_envs   = parse(app_envs)
+
+	# Solve
+	envs = solve(board_envs, app_envs)
+
+	# Result
+	print ' '.join(envs)
+
+
+if __name__ == '__main__':
+	main(*sys.argv)