libc/aarch64: Split out the MOPS functions

This allows static binaries to only include the functions they
reference.

Reviewed by:	imp
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D54775

lib/libc/aarch64/string/Makefile.inc

@@ -14,6 +14,11 @@ AARCH64_STRING_FUNCS= \
 	strnlen \
 	strrchr
 
+AARCH64_STRING_IFUNC_FILES= \
+	memcpy-mops.S \
+	memmove-mops.S \
+	memset-mops.S
+
 # SIMD-enhanced routines not derived from Arm's code
 MDSRCS+= \
 	memchr.S \
@@ -58,6 +63,15 @@ MDSRCS+=	${FUNC}.S
 CFLAGS.${FUNC}.S+=-I${SRCTOP}/contrib/arm-optimized-routines/string
 .endfor
 
+.for FILE in ${AARCH64_STRING_IFUNC_FILES}
+${FILE}: ${LIBC_SRCTOP}/aarch64/string/Makefile.inc
+	printf '/* %sgenerated by libc/aarch64/string/Makefile.inc */\n' @ > ${.TARGET}
+	printf '#include "aarch64/%s"\n' ${FILE} >> ${.TARGET}
+CLEANFILES+=   ${FILE}
+MDSRCS+=       ${FILE}
+CFLAGS.${FILE}+=-I${SRCTOP}/contrib/arm-optimized-routines/string
+.endfor
+
 # Several files are wrappers in the src tree for the implementation from
 # arm-optimized-routines
 CFLAGS.memchr.S+=-I${SRCTOP}/contrib/arm-optimized-routines/string

lib/libc/aarch64/string/memcpy.S

@@ -1,3 +1 @@
 #include "aarch64/memcpy-advsimd.S"
-#include "aarch64/memcpy-mops.S"
-#include "aarch64/memmove-mops.S"

lib/libc/aarch64/string/memset.S

@@ -1,2 +1 @@
 #include "aarch64/memset.S"
-#include "aarch64/memset-mops.S"