Don't use xxd to objectify files.

build/_objectify.py

@@ -0,0 +1,19 @@
+import sys
+from functools import partial
+
+if len(sys.argv) != 3:
+    sys.exit("Usage: %s <file> <symbol>" % sys.argv[0])
+filename = sys.argv[1]
+symbol = sys.argv[2]
+
+print("const uint8_t " + symbol + "[] = {")
+n = 0
+with open(filename, "rb") as in_file:
+    for c in iter(partial(in_file.read, 1), b""):
+        print("0x%02X," % ord(c), end="")
+        n += 1
+        if n % 16 == 0:
+            print()
+print("};")
+
+print("const size_t " + symbol + "_len = sizeof(" + symbol + ");")

build/utils.py

@@ -6,9 +6,9 @@
 def objectify(self, name, src: Target, symbol):
     normalrule(
         replaces=self,
-        ins=[src],
+        ins=["build/_objectify.py", src],
         outs=[basename(filenameof(src)) + ".h"],
-        commands=["xxd -i -n " + symbol + " {ins} > {outs}"],
+        commands=["$(PYTHON) {ins[0]} {ins[1]} " + symbol + " > {outs}"],
         label="OBJECTIFY",
     )