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-rw-r--r--py/mkrules.mk6
1 files changed, 6 insertions, 0 deletions
diff --git a/py/mkrules.mk b/py/mkrules.mk
index 9592d6c590..7d366c9c3e 100644
--- a/py/mkrules.mk
+++ b/py/mkrules.mk
@@ -97,4 +97,10 @@ print-cfg:
$(ECHO) "OBJ = $(OBJ)"
.PHONY: print-cfg
+print-def:
+ @$(ECHO) "The following defines are built into the $(CC) compiler"
+ touch __empty__.c
+ @$(CC) -E -Wp,-dM __empty__.c
+ @$(RM) -f __empty__.c
+
-include $(OBJ:.o=.P)