Update clang compilers (#2435)

* update clang

* add the gpg keys

toolset/setup/linux/systools/clang-3.8.sh

@@ -9,6 +9,7 @@ RETCODE=$(fw_exists ${IROOT}/clang-3.8.installed)
 sudo add-apt-repository -s "deb http://apt.llvm.org/`lsb_release -cs`/ llvm-toolchain-`lsb_release -cs`-3.8 main"
 wget -O - http://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
 sudo apt-get -yq update
-sudo apt-get install -qqy clang-3.8
+sudo apt-get install -qqy clang-3.8 lldb-3.8
 
 touch $IROOT/clang-3.8.installed
+

toolset/setup/linux/systools/clang-3.9.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+
+RETCODE=$(fw_exists ${IROOT}/clang-3.9.installed)
+[ ! "$RETCODE" == 0 ] || { \
+  source $IROOT/clang-3.9.installed
+  return 0; }
+
+sudo add-apt-repository -s "deb http://apt.llvm.org/`lsb_release -cs`/ llvm-toolchain-`lsb_release -cs`-3.9 main"
+wget -O - http://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
+sudo apt-get -yq update
+sudo apt-get install -qqy clang-3.9 lldb-3.9
+
+touch $IROOT/clang-3.9.installed
+