build: Allow patching/overriding platform spec.

1 files changed, 12 insertions, 1 deletions

diff --git a/build/scons_tools/tool_selectmcu.py b/build/scons_tools/tool_selectmcu.py
index f73caa1..38b154d 100644
--- a/build/scons_tools/tool_selectmcu.py
+++ b/build/scons_tools/tool_selectmcu.py
@@ -1,6 +1,14 @@
 from SCons.Script import *
 
-def SelectMCU(env, mcu, variant_dir = None):
+def do_patch(target, source):
+	for k, v in source.items():
+		if k in target and isinstance(v, dict):
+			do_patch(target[k], v)
+		
+		else:
+			target[k] = v
+
+def SelectMCU(env, mcu, variant_dir = None, patch = None):
 
 	spec = env.PlatformSpec(mcu = mcu)
 
@@ -8,6 +16,9 @@ def SelectMCU(env, mcu, variant_dir = None):
 		print('Unknown MCU: %s' % mcu)
 		Exit(1)
 
+	if patch:
+		do_patch(spec, patch)
+
 	detected_gcc = env.Detect([f'{toolchain}-gcc' for toolchain in spec['toolchains']])
 	if detected_gcc is None:
 		print('Couldn\'t find a suitable toolchain.')