Add support for ARMv8 64-bit (AArch64), linuxarm64

The patch adds supports for ARMv8 64-bit (AArch64). This is done
by introducing a new target -- linuxarm64 -- to ROOT6 build scripts
and configuration.

Signed-off-by: David Abdurachmanov <[email protected]>
Tested-by: David Abdurachmanov <[email protected]>
Signed-off-by: Danilo Piparo <[email protected]>

Author: David Abdurachmanov

config/ARCHS

@@ -2,6 +2,7 @@ aixgcc               for AIX >= 5.x with gcc >= 4.8
 freebsd7             for FreeBSD 7.x with gcc >= 4.8
 linux                for i386 Linux with gcc >= 4.8
 linuxarm             for ARM Linux with gcc >= 4.8
+linuxarm64           for ARMv8-A (AArch64) Linux with gcc >= 4.8
 linuxppcgcc          for PPC Linux with gcc >= 4.8
 linuxppc64gcc        for PPC 64 Linux with gcc >= 4.8
 linuxx8664gcc        for x86-64 Linux with gcc >= 4.8

config/root-config.in

@@ -240,6 +240,11 @@ linuxarm)
    auxcflags="${cxxversionflag} -fsigned-char"
    auxlibs="-lm -ldl -rdynamic"
    ;;
+linuxarm64)
+   # ARMv8-A (AArch64) Linux with gcc
+   auxcflags="${cxxversionflag} -fsigned-char"
+   auxlibs="-lm -ldl -rdynamic"
+   ;;
 freebsd)
    # FreeBSD with libc5
    auxcflags="${cxxversionflag} -Wno-deprecated-declarations"

configure

@@ -1360,6 +1360,7 @@ guess_architecture() {
         linux:x86_64:*)        arch=linuxx8664gcc   ;;
         linux:x32:*)           arch=linuxx32gcc     ;;
         linux:arm*:*)          arch=linuxarm        ;;
+        linux:aarch64:*)       arch=linuxarm64      ;;
         linux:hppa*:*)         arch=linux           ;;
         linux:sparc*:*)        arch=linux           ;;
         linux:parisc*:*)       arch=linuxhppa       ;;
@@ -1906,6 +1907,10 @@ linuxx8664*)
    logmsg "Will check 64bit libraries"
    checklinux64="yes"
    checklib64="yes" ;;
+linuxarm64)
+   logmsg "Will check 64bit libraries"
+   checklinux64="yes"
+   checklib64="yes" ;;
 linuxx32*)
    logmsg "Will check x32 libraries in the future"
    logmsg "For now expect proper libraries through configure flags" ;;

core/base/inc/RConfig.h

@@ -191,6 +191,14 @@
 #   endif
 #endif
 
+#if defined(linux) && defined(__aarch64__)
+#   define R__LINUX
+#   define R__UNIX
+#   define R__BYTESWAP
+#   define R__B64
+#   define NEED_SIGJMP
+#endif
+
 #if defined(__MACH__) && defined(__i386__) && !defined(__APPLE__)
 #   define R__HURD
 #   define f2cFortran   /* cfortran.h does not know HURD - sigh */

etc/Makefile.arch

@@ -245,6 +245,15 @@ LDFLAGS       = $(OPT)
 SOFLAGS       = -shared
 endif
 
+ifeq ($(ARCH),linuxarm64)
+# ARMv8-A (AArch64) Linux with gcc and glibc
+CXX           = g++
+CXXFLAGS      = $(OPT) -Wall -fPIC
+LD            = g++
+LDFLAGS       = $(OPT)
+SOFLAGS       = -shared
+endif
+
 ifeq ($(ARCH),freebsd4)
 # FreeBSD with glibc
 CXX           = g++

tmva/Makefile.arch

@@ -299,6 +299,15 @@ LDFLAGS       = -O
 SOFLAGS       = -shared
 endif
 
+ifeq ($(ARCH),linuxarm64)
+# ARMv8-A (AArch64) Linux with egcs
+CXX           = g++
+CXXFLAGS      = -O -Wall -fPIC -Wshadow -Woverloaded-virtual
+LD            = g++
+LDFLAGS       = -O
+SOFLAGS       = -shared
+endif
+
 ifeq ($(ARCH),mklinux)
 # MkLinux with libc5
 CXX           = g++