From 42aa83787fd0d3a5acd0ac7fbe7d148648be742d Mon Sep 17 00:00:00 2001
From: Nick Brassel <nick@tzarc.org>
Date: Thu, 23 Mar 2023 12:48:25 +1100
Subject: Optionally keep intermediate file listings in order to do comparisons
 between builds. (#20237)

---
 builddefs/build_keyboard.mk | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/builddefs/build_keyboard.mk b/builddefs/build_keyboard.mk
index 7a5412ccd2..6b264fe0ff 100644
--- a/builddefs/build_keyboard.mk
+++ b/builddefs/build_keyboard.mk
@@ -441,6 +441,14 @@ $(eval $(call add_qmk_prefix_defs,MCU_FAMILY,MCU_FAMILY))
 $(eval $(call add_qmk_prefix_defs,MCU_SERIES,MCU_SERIES))
 $(eval $(call add_qmk_prefix_defs,BOARD,BOARD))
 
+# Control whether intermediate file listings are generated
+# e.g.:
+#    make handwired/onekey/blackpill_f411:default KEEP_INTERMEDIATES=yes
+#    cat .build/obj_handwired_onekey_blackpill_f411_default/quantum/quantum.i | sed -e 's@^#.*@@g' -e 's@^\s*//.*@@g' -e '/^\s*$/d' | clang-format
+ifeq ($(strip $(KEEP_INTERMEDIATES)), yes)
+    OPT_DEFS += -save-temps=obj
+endif
+
 # TODO: remove this bodge?
 PROJECT_DEFS := $(OPT_DEFS)
 PROJECT_INC := $(VPATH) $(EXTRAINCDIRS) $(KEYBOARD_PATHS)
-- 
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