Added wrapper for clang modernize

Fixes LBCORE-815

LbUtils/scripts/lcg-clang-modernize-3.7

+#!/bin/sh
+# cern-lxdistcc-wrappers.sh: v1 KELEMEN Peter <lxdistcc-admins@cern.ch>
+#
+# 2012-10-17: Modified by Marco Clemencic
+#
+_self=${0##*/}
+
+hostos() {
+    arch=$(uname -i)
+    case $(lsb_release -si) in
+        ScientificCERNSLC)
+            os=slc
+            vers=$(lsb_release -sr | cut -d. -f1)
+            ;;
+        *)
+            os=$(lsb_release -si | tr '[:upper:]' '[:lower:]')
+            vers=$(lsb_release -sr)
+    esac
+    echo $arch-$os$vers
+}
+
+set_prefix() {
+    _dirname=$1
+    _version=$2
+
+    _platform=${LCG_hostos:-$(hostos)}
+
+    _external=${LCG_external_area:-/afs/cern.ch/sw/lcg/external}
+    _releases=${LCG_release_area:-/afs/cern.ch/sw/lcg/releases}
+    # take only the first entry in _releases
+    _releases=${_releases%%:*}
+
+    for _prefix in {${_releases},${_external}}/${_dirname}/${_version}/${_platform} ; do
+	if [ -d "${_prefix}" ] ; then
+	    break
+	fi
+    done
+}
+
+setup_gcc() {
+        _version=$1
+
+        set_prefix gcc ${_version}
+
+        _bin="${_prefix}/bin"
+        _lib="${_prefix}/lib64"
+        LD_LIBRARY_PATH=$(echo $LD_LIBRARY_PATH | sed 's-[^:]*/gcc/[^:]*:\?--g')
+        LD_LIBRARY_PATH="${_lib}${LD_LIBRARY_PATH:+:}${LD_LIBRARY_PATH}"
+        PATH="${_bin}${PATH:+:}${PATH}"
+        COMPILER_PATH="${_prefix}/lib/gcc/x86_64-unknown-linux-gnu/${_version}"
+
+        GCC_TOOLCHAIN="${_prefix}"
+        export LD_LIBRARY_PATH
+        export PATH
+        export COMPILER_PATH
+        export GCC_TOOLCHAIN
+}
+
+setup_clang() {
+
+        _clang_version=$1
+        case ${_clang_version} in
+          3.2) setup_gcc 4.6.3 ;;
+          3.3|3.4) setup_gcc 4.8.1 ;;
+          *) setup_gcc 4.9.3 ;;
+        esac
+
+        set_prefix llvm ${_clang_version}
+
+        _bin="${_prefix}/bin"
+        _lib="${_prefix}/lib64"
+        LD_LIBRARY_PATH=$(echo $LD_LIBRARY_PATH | sed 's-[^:]*/llvm/[^:]*:\?--g')
+        LD_LIBRARY_PATH="${_lib}${LD_LIBRARY_PATH:+:}${LD_LIBRARY_PATH}"
+        PATH="${_bin}${PATH:+:}${PATH}"
+
+        export LD_LIBRARY_PATH
+        export PATH
+        export COMPILER_PATH
+}
+
+case ${_self} in
+
+        lcg-[cg]++-[0-9].[0-9].[0-9]|lcg-gcc-[0-9].[0-9].[0-9]|lcg-gfortran-[0-9].[0-9].[0-9])
+
+                _version=${_self##*-}
+                setup_gcc $_version
+                _self=${_self%-*}
+                _self=${_self#*-}
+                ;;
+
+        lcg-clang-*|lcg-clang++-*)
+
+                _version=${_self##*-}
+                setup_clang $_version
+                _self=${_self%-*}
+                _self=${_self#*-}
+                if [ "${_self}" = "clang" -o "${_self}" = "clang++" ] ; then
+                  _self="${_self} --gcc-toolchain=${GCC_TOOLCHAIN}"
+                fi
+                ;;
+
+        *)
+                echo "E: Unsupported compiler '${_self}', please contact <marco.clemencic@cern.ch>"
+                exit 100
+                ;;
+esac
+exec ${_bin}/${_self} "$@"
+
+# End of file.