Add cross-builds for linux-aarch64

configure/os/CONFIG.Common.linux-aarch64

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+# CONFIG.Common.linux-aarch64
+#
+# Definitions for linux-arm target builds
+# Override these settings in CONFIG_SITE.Common.linux-aarch64
+#-------------------------------------------------------
+
+# Include definitions common to all Linux targets
+include $(CONFIG)/os/CONFIG.Common.linuxCommon
+
+ARCH_CLASS = aarch64
+

configure/os/CONFIG.linux-x86_64.linux-aarch64

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+# CONFIG.linux-x86_64.linux-aarch64
+#
+# Definitions for linux-x86_64 host - linux-aarch64 target builds
+# Sites may override these in CONFIG_SITE.linux-x86_64.linux-aarch64
+#-------------------------------------------------------
+
+VALID_BUILDS = Ioc
+GNU_TARGET = aarch64-linux
+
+# prefix of compiler tools
+CMPLR_SUFFIX =
+CMPLR_PREFIX = $(addsuffix -,$(GNU_TARGET))
+
+# Provide a link-time path for readline if needed
+OP_SYS_INCLUDES += $(READLINE_DIR:%=-I%/include)
+READLINE_LDFLAGS = $(READLINE_DIR:%=-L%/lib)
+RUNTIME_LDFLAGS_READLINE_YES_NO = $(READLINE_DIR:%=-Wl,-rpath,%/lib)
+RUNTIME_LDFLAGS += \
+    $(RUNTIME_LDFLAGS_READLINE_$(LINKER_USE_RPATH)_$(STATIC_BUILD))
+SHRLIBDIR_LDFLAGS += $(READLINE_LDFLAGS)
+PRODDIR_LDFLAGS += $(READLINE_LDFLAGS)
+
+# Library flags
+STATIC_LDFLAGS_YES= -Wl,-Bstatic
+STATIC_LDFLAGS_NO=
+STATIC_LDLIBS_YES= -Wl,-Bdynamic
+STATIC_LDLIBS_NO=
+

configure/os/CONFIG_SITE.Common.linux-aarch64

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+# CONFIG_SITE.Common.linux-aarch64
+#
+# Site Specific definitions for all linux-aarch64 targets
+#-------------------------------------------------------
+
+# NOTE for SHARED_LIBRARIES: In most cases if this is set to YES the
+# shared libraries will be found automatically.  However if the .so
+# files are installed at a different path to their compile-time path
+# then in order to be found at runtime do one of these:
+# a) LD_LIBRARY_PATH must include the full absolute pathname to
+#    $(INSTALL_LOCATION)/lib/$(EPICS_HOST_ARCH) when invoking base
+#    executables.
+# b) Add the runtime path to SHRLIB_DEPLIB_DIRS and PROD_DEPLIB_DIRS, which 
+#    will add the named directory to the list contained in the executables.
+# c) Add the runtime path to /etc/ld.so.conf and run ldconfig
+#    to inform the system of the shared library location.
+
+# Depending on your version of Linux you'll want one of the following
+# lines to enable command-line editing and history in iocsh.  If you're
+# not sure which, start with the top one and work downwards until the
+# build doesn't fail to link the readline library.  If none of them work,
+# comment them all out to build without readline support.
+
+# No other libraries needed (recent Fedora, Ubuntu etc.):
+#COMMANDLINE_LIBRARY = READLINE
+
+# Needs -lncurses (RHEL 5 etc.):
+#COMMANDLINE_LIBRARY = READLINE_NCURSES
+
+# Needs -lcurses (older versions)
+#COMMANDLINE_LIBRARY = READLINE_CURSES
+

configure/os/CONFIG_SITE.linux-x86_64.linux-aarch64

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+# CONFIG_SITE.linux-x86.linux-aarch64
+#
+# Site specific definitions for linux-x86 host - linux-aarch64 target builds
+#-------------------------------------------------------
+
+# Set GNU crosscompiler target name
+GNU_TARGET = aarch64-linux-gnu
+
+# Set GNU tools install path
+# Examples is the installation at the APS:
+GNU_DIR = /usr/local/Xilinx/SDK/2018.3/gnu/aarch64/lin/aarch64-linux
+
+# If cross-building shared libraries and the paths on the target machine are
+# different than on the build host, you should uncomment the lines below to
+# disable embedding compile-time library paths into the generated files.
+# You will need to provide another way for programs to find their shared
+# libraries at runtime, such as by setting LD_LIBRARY_PATH or (better) using
+# mechanisms related to /etc/ld.so.conf
+#SHRLIBDIR_RPATH_LDFLAGS_YES_NO =
+#PRODDIR_RPATH_LDFLAGS_YES_NO =
+# However it is usually simpler to set STATIC_BUILD=YES here and not
+# try to use shared libraries at all when cross-building, like this:
+STATIC_BUILD=YES
+SHARED_LIBRARIES=NO
+
+# To use libreadline, point this to its install prefix
+#READLINE_DIR = $(GNU_DIR)
+#READLINE_DIR = /tools/cross/linux-x86.linux-arm/readline
+# See CONFIG_SITE.Common.linux-arm for other COMMANDLINE_LIBRARY values
+#COMMANDLINE_LIBRARY = READLINE