Include pins.h in dependencies script (#19468)

buildroot/share/PlatformIO/scripts/common-dependencies-post.py

@@ -0,0 +1,16 @@
+#
+# common-dependencies-post.py
+# Convenience script to add build flags for Marlin Enabled Features
+#
+
+Import("env")
+Import("projenv")
+
+def apply_board_build_flags():
+	if not 'BOARD_CUSTOM_BUILD_FLAGS' in env['MARLIN_FEATURES']:
+		return
+	projenv.Append(CCFLAGS=env['MARLIN_FEATURES']['BOARD_CUSTOM_BUILD_FLAGS'].split())
+
+# We need to add the board build flags in a post script
+# so the platform build script doesn't overwrite the custom CCFLAGS
+apply_board_build_flags()

buildroot/share/PlatformIO/scripts/common-dependencies.h

@@ -149,3 +149,6 @@
     #define HAS_MENU_UBL
   #endif
 #endif
+
+// Include pins for the current board. Platform tests will be skipped. No HAL-defined pins.
+#include "../../../../Marlin/src/pins/pins.h"

buildroot/share/PlatformIO/scripts/common-dependencies.py

@@ -238,7 +238,7 @@ def load_marlin_features():
 		else:
 			cmd += ['-D' + s]
 
-	cmd += ['-w -dM -E -x c++ buildroot/share/PlatformIO/scripts/common-dependencies.h']
+	cmd += ['-D__MARLIN_PREBUILD__ -w -dM -E -x c++ buildroot/share/PlatformIO/scripts/common-dependencies.h']
 	cmd = ' '.join(cmd)
 	blab(cmd)
 	define_list = subprocess.check_output(cmd, shell=True).splitlines()