[PATCH] Add AArch64 support to CMake

[Renato Golin]

  Changing EE's lit config to check for target, not host_arch. This makes the tests unsupported on AArch64 (where the host arch is "aarch64").

Hi t.p.northover,

http://llvm-reviews.chandlerc.com/D2825

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2825?vs=7202&id=7203#toc

Files:
  autoconf/config.guess
  test/ExecutionEngine/lit.local.cfg

Index: autoconf/config.guess
===================================================================
--- autoconf/config.guess
+++ autoconf/config.guess
@@ -864,6 +864,22 @@
     i*86:Minix:*:*)
 	echo ${UNAME_MACHINE}-pc-minix
 	exit ;;
+    aarch64:Linux:*)
+	eval $set_cc_for_build
+	if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \
+	    | grep -q __ARM_EABI__
+	then
+	    echo ${UNAME_MACHINE}-unknown-linux-gnu
+	else
+	    if echo __ARM_PCS_VFP | $CC_FOR_BUILD -E - 2>/dev/null \
+		| grep -q __ARM_PCS_VFP
+	    then
+		echo ${UNAME_MACHINE}-unknown-linux-gnueabi
+	    else
+		echo ${UNAME_MACHINE}-unknown-linux-gnueabihf
+	    fi
+	fi
+	exit ;;
     alpha:Linux:*:*)
 	case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
 	  EV5)   UNAME_MACHINE=alphaev5 ;;
Index: test/ExecutionEngine/lit.local.cfg
===================================================================
--- test/ExecutionEngine/lit.local.cfg
+++ test/ExecutionEngine/lit.local.cfg
@@ -1,4 +1,5 @@
-if config.root.host_arch in ['PowerPC', 'AArch64', 'SystemZ']:
+targets = set(config.root.targets_to_build.split())
+if 'AArch64' in targets or 'PowerPC' in targets or 'SystemZ' in targets:
     config.unsupported = True
 
 if 'hexagon' in config.root.target_triple:
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