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-rw-r--r--py/mkrules.mk4
1 files changed, 4 insertions, 0 deletions
diff --git a/py/mkrules.mk b/py/mkrules.mk
index 1ab3ee59ba..2730eff415 100644
--- a/py/mkrules.mk
+++ b/py/mkrules.mk
@@ -45,6 +45,10 @@ vpath %.c . $(TOP)
$(BUILD)/%.o: %.c
$(call compile_c)
+$(BUILD)/%.pp: %.c
+ $(ECHO) "PreProcess $<"
+ $(Q)$(CC) $(CFLAGS) -E -Wp,-C,-dD,-dI -o $@ $<
+
# The following rule uses | to create an order only prereuisite. Order only
# prerequisites only get built if they don't exist. They don't cause timestamp
# checkng to be performed.