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-rw-r--r--py/mkrules.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/py/mkrules.mk b/py/mkrules.mk
index 3120066fd..6993a13a4 100644
--- a/py/mkrules.mk
+++ b/py/mkrules.mk
@@ -104,7 +104,7 @@ vpath %.cpp . $(TOP) $(USER_C_MODULES)
$(BUILD)/%.o: %.cpp
$(call compile_cxx)
-$(BUILD)/%.pp: %.c
+$(BUILD)/%.pp: %.c FORCE
$(ECHO) "PreProcess $<"
$(Q)$(CPP) $(CFLAGS) -Wp,-C,-dD,-dI -o $@ $<