COMP: ensure min compiler versions are properly noted.

- update makeLLVM to build latest clang (3.9.0), which needs cmake.

Allclean

@@ -67,7 +67,7 @@ fi
 #------------------------------------------------------------------------------
 
 # Clean various packages via 'distclean'
-for i in openmpi-* ADIOS-*
+for i in openmpi-* ADIOS-* metis-*
 do
     [ -d "$i" ] && (
         echo

README.org

@@ -11,19 +11,18 @@
 * Description
   Scripts for building third-party packages.
 * Build Order:
-  + makeGcc   (recommended if the system gcc is < 4.7)
+  + makeGcc   (recommended if the system gcc is < 4.8)
   + Allwmake  (Builds OpenMPI, Scotch etc.)
   + makeCmake (if the system cmake version is < 2.8.8)
   + makeParaView
 *** Optional Build Components:
-    + makeLLVM  (Replaces makeGcc in the above description
-    - to use clang as compiler)
+    + makeLLVM  (Replaces makeGcc in the above description to use clang as compiler)
     + makeADIOS (Only required for ADIOS support)
     + makeCCMIO (Only required for conversion of STAR-CCM+ meshes)
     + Allclean  (Only required to save disk space)
 * Versions and locations to download the third party packages
 *** Gcc C++ Compiler
-    The minimum version of gcc required is 4.5.0
+    The minimum version of gcc required is 4.8.0
     + gcc   http://gcc.gnu.org/releases.html
     + gmp   http://gmplib.org/
             ftp://ftp.gnu.org/gnu/gmp/gmp-6.1.0.tar.bz2
@@ -31,6 +30,10 @@
             ftp://ftp.gnu.org/gnu/mpfr/mpfr-3.1.4.tar.bz2
     + mpc   http://www.multiprecision.org/
             ftp://ftp.gnu.org/gnu/mpc/mpc-1.0.3.tar.gz
+*** Clang/LLVM C++ Compiler
+    The minimum version of clang required is 3.3
+    + clang http://llvm.org/releases/3.9.0/cfe-3.9.0.src.tar.xz
+    + llvm  http://llvm.org/releases/3.9.0/llvm-3.9.0.src.tar.xz
 *** Parallel Processing
 ***** Scotch
       + Scotch/PtScotch: https://gforge.inria.fr/frs/download.php/file/34099/scotch_6.0.3.tar.gz

makeLLVM

@@ -52,7 +52,7 @@
 #
 #------------------------------------------------------------------------------
 # get default llvm/clang version
-WM_COMPILER_TYPE="ThirdParty"     # ensure we get the correct compiler settings
+WM_COMPILER_TYPE=ThirdParty       # ensure we get the correct compiler settings
 WM_COMPILER=Clang                 # force values for 'clang'
 
 . $WM_PROJECT_DIR/etc/config.sh/functions
@@ -79,6 +79,8 @@ usage() {
 
 usage: $Script [OPTION] [llvm-VERSION]
 options:
+  -cmake PATH       with cmake from the path given
+  -gcc              force gcc/g++ instead of the values from \$WM_CC, \$WM_CXX
   -help
 
 * build llvm/clang
@@ -89,6 +91,10 @@ USAGE
 }
 
 #-----------------------------------------------------------------------------
+# Ensure CMake gets the correct C/C++ compiler
+[ -n "$WM_CC" ]  && export CC="$WM_CCX"
+[ -n "$WM_CXX" ] && export CXX="$WM_CXX"
+
 
 # parse options
 while [ "$#" -gt 0 ]
@@ -97,6 +103,15 @@ do
     -h | -help)
         usage
         ;;
+    -gcc)
+        export CC=gcc    # use gcc/g++
+        export CXX=g++
+        ;;
+    -cmake)
+        [ "$#" -ge 2 ] || die "'$1' option requires an argument"
+        CMAKE_PATH="${2%%/}"
+        shift
+        ;;
     llvm-[0-9]* | llvm-svn*)
         llvmPACKAGE="${1%%/}"
         ;;
@@ -114,16 +129,16 @@ done
 buildBASE=$WM_THIRD_PARTY_DIR/build/$WM_ARCH$WM_COMPILER_ARCH
 installBASE=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER_ARCH
 
-LLVM_ARCH_PATH=$installBASE/$llvmPACKAGE
+# Build LLVM (clang)
+#   LLVM_SOURCE_DIR : location of the original sources
+#   LLVM_BINARY_DIR : location of the build
+#   LLVM_ARCH_PATH  : location of the installed program
+# - Strip any trailing '.src' from the proper names
+
+LLVM_SOURCE_DIR=$WM_THIRD_PARTY_DIR/$llvmPACKAGE
+LLVM_BINARY_DIR=$buildBASE/${llvmPACKAGE%%.src}
+LLVM_ARCH_PATH=$installBASE/${llvmPACKAGE%%.src}
 
-# name of source directory
-# - may have a llvm/ subdirectory, depending on how the sources were fetched
-#
-sourceDIR=$WM_THIRD_PARTY_DIR/$llvmPACKAGE
-if [ -f $sourceDIR/llvm/configure ]
-then
-    sourceDIR=$sourceDIR/llvm
-fi
 
 #
 # Build LLVM
@@ -132,31 +147,63 @@ echo "---------------"
 if [ -d $LLVM_ARCH_PATH ]
 then
     echo "Already built: $llvmPACKAGE"
-else
-    echo "Starting build: $llvmPACKAGE"
+elif [ -z "$CMAKE_PATH" ] && $LLVM_SOURCE_DIR/configure -help >/dev/null 2>&1
+then
+    # configure can be used prior to 3.9.0
+    # but use cmake if someone explicitly mentioned -cmake on the command-line
+
+    echo "Starting build: $llvmPACKAGE (using configure)"
     echo
-(
-    cd $sourceDIR || exit 1
-    make distclean 2>/dev/null
+    (
+        cd $LLVM_SOURCE_DIR || exit 1
+        make distclean 2>/dev/null
 
-    buildDIR=$buildBASE/$llvmPACKAGE
-    rm -rf $buildDIR
-    mkdir -p $buildDIR
-    cd $buildDIR
+        rm -rf $LLVM_BINARY_DIR
+        mkdir -p $LLVM_BINARY_DIR
+        cd $LLVM_BINARY_DIR
+
+        set -x
+        $LLVM_SOURCE_DIR/configure \
+            --prefix=$LLVM_ARCH_PATH \
+            --with-gcc-toolchain=$(which gcc | sed s%/bin/gcc%%) \
+            --enable-optimized \
+            --enable-shared \
+        && make -j $WM_NCOMPPROCS \
+        && make install \
+        && echo "Built: $llvmPACKAGE"
+    ) || {
+        echo "Error building: $llvmPACKAGE"
+        exit 1
+    }
+
+else
+    # CMake used with 3.9.0 and later
+
+    echo "Starting build: $llvmPACKAGE (using cmake)"
+    echo
+    (
+        cd $LLVM_SOURCE_DIR || exit 1
+
+        rm -rf $LLVM_BINARY_DIR
+        mkdir -p $LLVM_BINARY_DIR
+        cd $LLVM_BINARY_DIR
+
+        cmake=$(findCMake)
+
+        set -x
+        $cmake \
+            -DCMAKE_INSTALL_PREFIX=$LLVM_ARCH_PATH \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DBUILD_SHARED_LIBS:BOOL=ON \
+            $LLVM_SOURCE_DIR \
+        && make -j $WM_NCOMPPROCS \
+        && make install \
+        && echo "Built: $llvmPACKAGE"
+    ) || {
+        echo "Error building: $llvmPACKAGE"
+        exit 1
+    }
 
-    set -x
-    $sourceDIR/configure \
-        --prefix=$LLVM_ARCH_PATH \
-        --with-gcc-toolchain=$(which gcc | sed s%/bin/gcc%%) \
-        --enable-optimized \
-        --enable-shared \
-    && make -j $WM_NCOMPPROCS \
-    && make install \
-    && echo "Built: $llvmPACKAGE"
-) || {
-    echo "Error building: $llvmPACKAGE"
-    exit 1
-}
 fi
 
 #------------------------------------------------------------------------------