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Assigning CPU_CFLAGS in Rules.mak overwrites the already pre-fill with
-fno-builtin and friends and thus fails to link ldso on modern gccc with
undefined references to memcpy et al.

--- uClibc-ng-1.0.39/Rules.mak.vanilla	2021-10-07 13:11:29.593860466 +0200
+++ uClibc-ng-1.0.39/Rules.mak	2021-10-07 13:12:00.672862682 +0200
@@ -492,7 +492,7 @@
 ifeq ($(TARGET_ARCH),bfin)
 	SYMBOL_PREFIX=_
 ifeq ($(UCLIBC_FORMAT_FDPIC_ELF),y)
-	CPU_CFLAGS-y:=-mfdpic
+	CPU_CFLAGS-y+=-mfdpic
 	CPU_LDFLAGS-y += -Wl,-melf32bfinfd
 	PICFLAG:=-fpic
 	PIEFLAG_NAME:=-fpie