Begin remove old LLVM configuration code

configure

@@ -306,43 +306,12 @@ fi
 
 if [ ! -z "$CFG_LLVM_ROOT" -a -e "$CFG_LLVM_ROOT/bin/llvm-config" ]
 then
-    CFG_LLVM_CONFIG="$CFG_LLVM_ROOT/bin/llvm-config"
+    step_msg "using custom LLVM"
-fi
 
-if [ ! -z "$CFG_LLVM_ROOT" -a -z "$CFG_LLVM_CONFIG" ]
+    LLVM_CONFIG="$CFG_LLVM_ROOT/bin/llvm-config"
-then
+    LLVM_VERSION=$($CFG_LLVM_CONFIG --version)
-    CFG_LLVM_INCDIR="$CFG_LLVM_ROOT/include"
-    CFG_LLVM_BINDIR="$CFG_LLVM_ROOT/bin"
-    CFG_LLVM_LIBDIR="$CFG_LLVM_ROOT/lib"
-    CFG_LLVM_CXXFLAGS="-I$CFG_LLVM_INCDIR"
-    CFG_LLVM_LDFLAGS=""
-    CFG_LLVM_LIBS=$(find "$CFG_LLVM_LIBDIR" \
-                    -name '*.lib' \
-                    -exec echo '\"{}\"' ';' \
-                    | xargs echo)
-    CFG_LLVM_VERSION=$("$CFG_LLVM_BINDIR/llc" \
-                       --version \
-                       | grep version \
-                       | cut -d ' ' -f 5-)
-    CFG_LLVM_TRIPLE=$("$CFG_LLVM_BINDIR/llc" \
-                      --version \
-                      | grep Host: \
-                      | cut -d ' ' -f 4-)
-elif [ ! -z "$CFG_LLVM_CONFIG" ]
-then
-    CFG_LLVM_VERSION=$($CFG_LLVM_CONFIG --version)
-    CFG_LLVM_INCDIR=$($CFG_LLVM_CONFIG --includedir)
-    CFG_LLVM_BINDIR=$($CFG_LLVM_CONFIG --bindir)
-    CFG_LLVM_LIBDIR=$($CFG_LLVM_CONFIG --libdir)
-    CFG_LLVM_CXXFLAGS=$($CFG_LLVM_CONFIG --cxxflags)
-    CFG_LLVM_LDFLAGS=$($CFG_LLVM_CONFIG --ldflags)
-    CFG_LLVM_LIBS=$($CFG_LLVM_CONFIG --libs)
-    CFG_LLVM_TRIPLE=$($CFG_LLVM_CONFIG --host-target)
-else
-    err "no llvm-config found and no --llvm-root specified"
-fi
 
-case $CFG_LLVM_VERSION in
+    case $LLVM_VERSION in
 	(3.0svn | 3.0 | 3.1svn)
 	    step_msg "found ok version of LLVM: $CFG_LLVM_VERSION"
 	    ;;
@@ -350,6 +319,7 @@ case $CFG_LLVM_VERSION in
 	    err "bad LLVM version: $CFG_LLVM_VERSION, need >=3.0svn"
 	    ;;
     esac
+fi
 
 if [ ! -z "$CFG_ENABLE_CLANG" ]
 then
@@ -381,18 +351,6 @@ then
     CFG_PREFIX=/usr/local
 fi
 
-if [ ! -z "$CFG_LLVM_TRIPLE" ]
-then
-    if [ $CFG_HOST_TRIPLE != $CFG_LLVM_TRIPLE ]
-    then
-        warn "LLVM host-triple $CFG_LLVM_TRIPLE differs from"
-        warn "detected host triple $CFG_HOST_TRIPLE"
-        warn "choosing LLVM host-triple instead"
-        msg ""
-        CFG_HOST_TRIPLE=$CFG_LLVM_TRIPLE
-    fi
-fi
-
 if [ -z "$CFG_TARGET_TRIPLES" ]
 then
     CFG_TARGET_TRIPLES="${CFG_HOST_TRIPLE}"
@@ -405,14 +363,6 @@ putvar CFG_C_COMPILER
 putvar CFG_PREFIX
 
 putvar CFG_LLVM_ROOT
-putvar CFG_LLVM_CONFIG
-putvar CFG_LLVM_INCDIR
-putvar CFG_LLVM_BINDIR
-putvar CFG_LLVM_LIBDIR
-putvar CFG_LLVM_CXXFLAGS
-putvar CFG_LLVM_LDFLAGS
-putvar CFG_LLVM_LIBS
-putvar CFG_LLVM_TRIPLE
 
 step_msg "making directories"
 
@@ -494,13 +444,15 @@ msg
 
 
 # Configure llvm. Here we go...
-step_msg "configuring LLVM"
-
 CFG_LLVM_SRC_DIR=${CFG_SRC_DIR}src/llvm
 CFG_LLVM_BUILD_DIR=${CFG_BUILD_DIR}/llvm
 # Just use LLVM straight from its build directory to avoid 'make install' time
 CFG_LLVM_INST_DIR=${CFG_LLVM_BUILD_DIR}/Release+Asserts
 
+if [ -z $CFG_LLVM_ROOT ]
+then
+    step_msg "configuring LLVM"
+
     LLVM_TARGETS="--enable-targets=x86,x86_64"
     LLVM_BUILD="--build=${CFG_HOST_TRIPLE}"
     LLVM_HOST="--host=${CFG_HOST_TRIPLE}"
@@ -541,6 +493,10 @@ cd $CFG_LLVM_BUILD_DIR
     # FIXME: This won't work if CFG_SRC_DIR is absolute
     ${CFG_BUILD_DIR}/${CFG_LLVM_SRC_DIR}/configure $LLVM_FLAGS
     cd $CFG_BUILD_DIR
+else
+    # The user is using their own LLVM
+    CFG_LLVM_INST_DIR=$CFG_LLVM_ROOT
+fi
 
 putvar CFG_LLVM_SRC_DIR
 putvar CFG_LLVM_BUILD_DIR