diff --git a/libc/arch-arm/arm.mk b/libc/arch-arm/arm.mk
index 58c5eb6..76f465e 100644
--- a/libc/arch-arm/arm.mk
+++ b/libc/arch-arm/arm.mk
@@ -1,33 +1,19 @@
 # 32-bit arm.
 
-#
-# Default implementations of functions that are commonly optimized.
-#
-
 libc_bionic_src_files_arm += \
-    bionic/strchr.cpp \
-    bionic/strnlen.c \
-    bionic/strrchr.cpp \
+    arch-arm/generic/bionic/memcmp.S \
+    arch-arm/generic/bionic/memcpy.S \
+    arch-arm/generic/bionic/memset.S \
+    arch-arm/generic/bionic/strcmp.S \
+    arch-arm/generic/bionic/strcpy.S \
+    arch-arm/generic/bionic/strlen.c \
 
-libc_freebsd_src_files_arm += \
-    upstream-freebsd/lib/libc/string/wcscat.c \
-    upstream-freebsd/lib/libc/string/wcschr.c \
-    upstream-freebsd/lib/libc/string/wcscmp.c \
-    upstream-freebsd/lib/libc/string/wcscpy.c \
-    upstream-freebsd/lib/libc/string/wcslen.c \
-    upstream-freebsd/lib/libc/string/wcsrchr.c \
-    upstream-freebsd/lib/libc/string/wmemcmp.c \
-    upstream-freebsd/lib/libc/string/wmemmove.c \
+libc_bionic_src_files_exclude_arm += \
+    bionic/__memcpy_chk.cpp \
+    bionic/__memset_chk.cpp \
 
-libc_openbsd_src_files_arm += \
-    upstream-openbsd/lib/libc/string/memchr.c \
-    upstream-openbsd/lib/libc/string/memrchr.c \
-    upstream-openbsd/lib/libc/string/stpncpy.c \
-    upstream-openbsd/lib/libc/string/strlcat.c \
-    upstream-openbsd/lib/libc/string/strlcpy.c \
-    upstream-openbsd/lib/libc/string/strncat.c \
-    upstream-openbsd/lib/libc/string/strncmp.c \
-    upstream-openbsd/lib/libc/string/strncpy.c \
+libc_openbsd_src_files_exclude_arm += \
+    upstream-openbsd/lib/libc/string/strcpy.c \
 
 #
 # Inherently architecture-specific code.
@@ -52,6 +38,7 @@
 ifeq ($(strip $(TARGET_$(my_2nd_arch_prefix)CPU_VARIANT)),)
   $(warning TARGET_$(my_2nd_arch_prefix)ARCH is arm, but TARGET_$(my_2nd_arch_prefix)CPU_VARIANT is not defined)
 endif
+ifneq ($(TARGET_$(my_2nd_arch_prefix)CPU_VARIANT),generic)
 cpu_variant_mk := $(LOCAL_PATH)/arch-arm/$(TARGET_$(my_2nd_arch_prefix)CPU_VARIANT)/$(TARGET_$(my_2nd_arch_prefix)CPU_VARIANT).mk
 ifeq ($(wildcard $(cpu_variant_mk)),)
 $(error "TARGET_$(my_2nd_arch_prefix)CPU_VARIANT not set or set to an unknown value. Possible values are cortex-a7, cortex-a8, cortex-a9, cortex-a15, krait, denver. Use generic for devices that do not have a CPU similar to any of the supported cpu variants.")
@@ -60,6 +47,7 @@
 libc_common_additional_dependencies += $(cpu_variant_mk)
 
 cpu_variant_mk :=
+endif
 
 
 libc_crt_target_cflags_arm := \
diff --git a/libc/arch-arm/cortex-a15/cortex-a15.mk b/libc/arch-arm/cortex-a15/cortex-a15.mk
index 6fa3270..20202a7 100644
--- a/libc/arch-arm/cortex-a15/cortex-a15.mk
+++ b/libc/arch-arm/cortex-a15/cortex-a15.mk
@@ -1,3 +1,17 @@
+libc_openbsd_src_files_exclude_arm += \
+    upstream-openbsd/lib/libc/string/memmove.c \
+    upstream-openbsd/lib/libc/string/stpcpy.c \
+    upstream-openbsd/lib/libc/string/strcat.c \
+
+libc_bionic_src_files_exclude_arm += \
+    arch-arm/generic/bionic/memcpy.S \
+    arch-arm/generic/bionic/memset.S \
+    arch-arm/generic/bionic/strcmp.S \
+    arch-arm/generic/bionic/strcpy.S \
+    arch-arm/generic/bionic/strlen.c \
+    bionic/__strcat_chk.cpp \
+    bionic/__strcpy_chk.cpp \
+
 libc_bionic_src_files_arm += \
     arch-arm/cortex-a15/bionic/memcpy.S \
     arch-arm/cortex-a15/bionic/memset.S \
@@ -10,7 +24,4 @@
     arch-arm/cortex-a15/bionic/strlen.S \
 
 libc_bionic_src_files_arm += \
-    arch-arm/generic/bionic/memcmp.S \
-
-libc_bionic_src_files_arm += \
     arch-arm/denver/bionic/memmove.S \
diff --git a/libc/arch-arm/cortex-a53.a57/cortex-a53.a57.mk b/libc/arch-arm/cortex-a53.a57/cortex-a53.a57.mk
index 0eec165..6455d04 100644
--- a/libc/arch-arm/cortex-a53.a57/cortex-a53.a57.mk
+++ b/libc/arch-arm/cortex-a53.a57/cortex-a53.a57.mk
@@ -3,6 +3,20 @@
 # The cortex-a7 optimized routines, and the cortex-a53 optimized routines
 # decrease performance on cortex-a57 processors by as much as 20%.
 
+libc_openbsd_src_files_exclude_arm += \
+    upstream-openbsd/lib/libc/string/memmove.c \
+    upstream-openbsd/lib/libc/string/stpcpy.c \
+    upstream-openbsd/lib/libc/string/strcat.c \
+
+libc_bionic_src_files_exclude_arm += \
+    arch-arm/generic/bionic/memcpy.S \
+    arch-arm/generic/bionic/memset.S \
+    arch-arm/generic/bionic/strcmp.S \
+    arch-arm/generic/bionic/strcpy.S \
+    arch-arm/generic/bionic/strlen.c \
+    bionic/__strcat_chk.cpp \
+    bionic/__strcpy_chk.cpp \
+
 libc_bionic_src_files_arm += \
     arch-arm/cortex-a15/bionic/memcpy.S \
     arch-arm/cortex-a15/bionic/memset.S \
@@ -15,7 +29,4 @@
     arch-arm/cortex-a15/bionic/strlen.S \
 
 libc_bionic_src_files_arm += \
-    arch-arm/generic/bionic/memcmp.S \
-
-libc_bionic_src_files_arm += \
     arch-arm/denver/bionic/memmove.S \
diff --git a/libc/arch-arm/cortex-a53/cortex-a53.mk b/libc/arch-arm/cortex-a53/cortex-a53.mk
index bb00433..9b431ae 100644
--- a/libc/arch-arm/cortex-a53/cortex-a53.mk
+++ b/libc/arch-arm/cortex-a53/cortex-a53.mk
@@ -1,3 +1,17 @@
+libc_openbsd_src_files_exclude_arm += \
+    upstream-openbsd/lib/libc/string/memmove.c \
+    upstream-openbsd/lib/libc/string/stpcpy.c \
+    upstream-openbsd/lib/libc/string/strcat.c \
+
+libc_bionic_src_files_exclude_arm += \
+    arch-arm/generic/bionic/memcpy.S \
+    arch-arm/generic/bionic/memset.S \
+    arch-arm/generic/bionic/strcmp.S \
+    arch-arm/generic/bionic/strcpy.S \
+    arch-arm/generic/bionic/strlen.c \
+    bionic/__strcat_chk.cpp \
+    bionic/__strcpy_chk.cpp \
+
 libc_bionic_src_files_arm += \
     arch-arm/cortex-a53/bionic/memcpy.S \
     arch-arm/cortex-a53/bionic/__strcat_chk.S \
@@ -14,7 +28,4 @@
     arch-arm/cortex-a15/bionic/strlen.S \
 
 libc_bionic_src_files_arm += \
-    arch-arm/generic/bionic/memcmp.S \
-
-libc_bionic_src_files_arm += \
     arch-arm/denver/bionic/memmove.S \
diff --git a/libc/arch-arm/cortex-a7/cortex-a7.mk b/libc/arch-arm/cortex-a7/cortex-a7.mk
index b6af4da..f570d0f 100644
--- a/libc/arch-arm/cortex-a7/cortex-a7.mk
+++ b/libc/arch-arm/cortex-a7/cortex-a7.mk
@@ -1,3 +1,17 @@
+libc_openbsd_src_files_exclude_arm += \
+    upstream-openbsd/lib/libc/string/memmove.c \
+    upstream-openbsd/lib/libc/string/stpcpy.c \
+    upstream-openbsd/lib/libc/string/strcat.c \
+
+libc_bionic_src_files_exclude_arm += \
+    arch-arm/generic/bionic/memcpy.S \
+    arch-arm/generic/bionic/memset.S \
+    arch-arm/generic/bionic/strcmp.S \
+    arch-arm/generic/bionic/strcpy.S \
+    arch-arm/generic/bionic/strlen.c \
+    bionic/__strcat_chk.cpp \
+    bionic/__strcpy_chk.cpp \
+
 libc_bionic_src_files_arm += \
     arch-arm/cortex-a7/bionic/memset.S \
 
@@ -12,7 +26,4 @@
     arch-arm/cortex-a15/bionic/strlen.S \
 
 libc_bionic_src_files_arm += \
-    arch-arm/generic/bionic/memcmp.S \
-
-libc_bionic_src_files_arm += \
     arch-arm/denver/bionic/memmove.S \
diff --git a/libc/arch-arm/cortex-a9/cortex-a9.mk b/libc/arch-arm/cortex-a9/cortex-a9.mk
index 7b38de1..8a26d6b 100644
--- a/libc/arch-arm/cortex-a9/cortex-a9.mk
+++ b/libc/arch-arm/cortex-a9/cortex-a9.mk
@@ -1,3 +1,18 @@
+libc_openbsd_src_files_exclude_arm += \
+    upstream-openbsd/lib/libc/string/memmove.c \
+    upstream-openbsd/lib/libc/string/stpcpy.c \
+    upstream-openbsd/lib/libc/string/strcat.c \
+    upstream-openbsd/lib/libc/string/strcpy.c \
+
+libc_bionic_src_files_exclude_arm += \
+    arch-arm/generic/bionic/memcpy.S \
+    arch-arm/generic/bionic/memset.S \
+    arch-arm/generic/bionic/strcmp.S \
+    arch-arm/generic/bionic/strcpy.S \
+    arch-arm/generic/bionic/strlen.c \
+    bionic/__strcat_chk.cpp \
+    bionic/__strcpy_chk.cpp \
+
 libc_bionic_src_files_arm += \
     arch-arm/cortex-a9/bionic/memcpy.S \
     arch-arm/cortex-a9/bionic/memset.S \
@@ -10,7 +25,4 @@
     arch-arm/cortex-a9/bionic/strlen.S \
 
 libc_bionic_src_files_arm += \
-    arch-arm/generic/bionic/memcmp.S \
-
-libc_bionic_src_files_arm += \
     arch-arm/denver/bionic/memmove.S \
diff --git a/libc/arch-arm/denver/denver.mk b/libc/arch-arm/denver/denver.mk
index 5fddf95..f167991 100644
--- a/libc/arch-arm/denver/denver.mk
+++ b/libc/arch-arm/denver/denver.mk
@@ -1,5 +1,18 @@
+libc_openbsd_src_files_exclude_arm += \
+    upstream-openbsd/lib/libc/string/memmove.c \
+    upstream-openbsd/lib/libc/string/stpcpy.c \
+    upstream-openbsd/lib/libc/string/strcat.c \
+
+libc_bionic_src_files_exclude_arm += \
+    arch-arm/generic/bionic/memcpy.S \
+    arch-arm/generic/bionic/memset.S \
+    arch-arm/generic/bionic/strcmp.S \
+    arch-arm/generic/bionic/strcpy.S \
+    arch-arm/generic/bionic/strlen.c \
+    bionic/__strcat_chk.cpp \
+    bionic/__strcpy_chk.cpp \
+
 libc_bionic_src_files_arm += \
-    arch-arm/generic/bionic/memcmp.S \
     arch-arm/denver/bionic/memcpy.S \
     arch-arm/denver/bionic/memmove.S \
     arch-arm/denver/bionic/memset.S \
diff --git a/libc/arch-arm/generic/generic.mk b/libc/arch-arm/generic/generic.mk
deleted file mode 100644
index e49d6d2..0000000
--- a/libc/arch-arm/generic/generic.mk
+++ /dev/null
@@ -1,14 +0,0 @@
-libc_bionic_src_files_arm += \
-    arch-arm/generic/bionic/memcmp.S \
-    arch-arm/generic/bionic/memcpy.S \
-    arch-arm/generic/bionic/memset.S \
-    arch-arm/generic/bionic/strcmp.S \
-    arch-arm/generic/bionic/strcpy.S \
-    arch-arm/generic/bionic/strlen.c \
-    bionic/__strcat_chk.cpp \
-    bionic/__strcpy_chk.cpp \
-
-libc_openbsd_src_files_arm += \
-    upstream-openbsd/lib/libc/string/memmove.c \
-    upstream-openbsd/lib/libc/string/stpcpy.c \
-    upstream-openbsd/lib/libc/string/strcat.c \
diff --git a/libc/arch-arm/krait/krait.mk b/libc/arch-arm/krait/krait.mk
index 88b4d66..f8e3452 100644
--- a/libc/arch-arm/krait/krait.mk
+++ b/libc/arch-arm/krait/krait.mk
@@ -1,3 +1,18 @@
+libc_openbsd_src_files_exclude_arm += \
+    upstream-openbsd/lib/libc/string/memmove.c \
+    upstream-openbsd/lib/libc/string/stpcpy.c \
+    upstream-openbsd/lib/libc/string/stpcpy.c \
+    upstream-openbsd/lib/libc/string/strcat.c \
+
+libc_bionic_src_files_exclude_arm += \
+    arch-arm/generic/bionic/memcpy.S \
+    arch-arm/generic/bionic/memset.S \
+    arch-arm/generic/bionic/strcmp.S \
+    arch-arm/generic/bionic/strcpy.S \
+    arch-arm/generic/bionic/strlen.c \
+    bionic/__strcat_chk.cpp \
+    bionic/__strcpy_chk.cpp \
+
 libc_bionic_src_files_arm += \
     arch-arm/krait/bionic/memcpy.S \
     arch-arm/krait/bionic/memset.S \
@@ -13,7 +28,4 @@
     arch-arm/cortex-a15/bionic/strlen.S \
 
 libc_bionic_src_files_arm += \
-    arch-arm/generic/bionic/memcmp.S \
-
-libc_bionic_src_files_arm += \
     arch-arm/denver/bionic/memmove.S \