1 files changed, 35 insertions, 0 deletions
diff --git a/fpga/hp_lcd_driver/relpath.mk b/fpga/hp_lcd_driver/relpath.mk
new file mode 100644
index 0000000..ee42901
--- /dev/null
+++ b/fpga/hp_lcd_driver/relpath.mk
@@ -0,0 +1,35 @@
+override define \s :=
+$() $()
+endef
+
+ifndef $(\s)
+override $(\s) :=
+else
+$(error Defined special variable '$(\s)': reserved for internal use)
+endif
+
+override define dirname
+$(patsubst %/,%,$(dir $(patsubst %/,%,$1)))
+endef
+
+override define prefix_1
+$(if $(or $\
+$(patsubst $(abspath $3)%,,$(abspath $1)),$\
+$(patsubst $(abspath $3)%,,$(abspath $2))),$\
+$(strip $(call prefix_1,$1,$2,$(call dirname,$3))),$\
+$(strip $(abspath $3)))
+endef
+
+override define prefix
+$(call prefix_1,$1,$2,$1)
+endef
+
+override define relpath_1
+$(patsubst /%,%,$(subst $(\s),/,$(patsubst %,..,$(subst /,$(\s),$\
+$(patsubst $3%,%,$(abspath $2)))))$\
+$(patsubst $3%,%,$(abspath $1)))
+endef
+
+override define relpath
+$(call relpath_1,$1,$2,$(call prefix,$1,$2))
+endef