+# Check whether --with-clang was given.
+if test "${with_clang+set}" = set; then
+ withval=$with_clang;
+else
+ with_clang=default
+fi
+
+
+
+# Check whether --with-built-clang was given.
+if test "${with_built_clang+set}" = set; then
+ withval=$with_built_clang;
+else
+ with_built_clang=check
+fi
+
+
+{ echo "$as_me:$LINENO: checking clang compiler" >&5
+echo $ECHO_N "checking clang compiler... $ECHO_C" >&6; }
+WITH_CLANGPATH=""
+WITH_BUILT_CLANG=0
+if test "$with_clang" != "default"; then
+ WITH_CLANGPATH="$with_clang"
+ if ! test -x "$WITH_CLANGPATH"; then
+ { { echo "$as_me:$LINENO: error: invalid --with-clang, path does not specify an executable" >&5
+echo "$as_me: error: invalid --with-clang, path does not specify an executable" >&2;}
+ { (exit 1); exit 1; }; }
+ fi
+elif test "$with_built_clang" = "yes"; then
+ WITH_BUILT_CLANG=1
+elif test "$with_built_clang" = "no"; then
+ WITH_BUILT_CLANG=0
+else
+ if test "$with_built_clang" != "check"; then
+ { { echo "$as_me:$LINENO: error: invalid value for --with-built-clang." >&5
+echo "$as_me: error: invalid value for --with-built-clang." >&2;}
+ { (exit 1); exit 1; }; }
+ fi
+
+ if test -f ${srcdir}/tools/clang/README.txt; then
+ WITH_BUILT_CLANG=1
+ fi
+fi
+
+if ! test -z "$WITH_CLANGPATH"; then
+ { echo "$as_me:$LINENO: result: $WITH_CLANGPATH" >&5
+echo "${ECHO_T}$WITH_CLANGPATH" >&6; }
+ WITH_CLANGXXPATH=`"$WITH_CLANGPATH" --print-prog-name=clang++`
+elif test "$WITH_BUILT_CLANG" = "1"; then
+ { echo "$as_me:$LINENO: result: built" >&5
+echo "${ECHO_T}built" >&6; }
+else
+ { echo "$as_me:$LINENO: result: none" >&5
+echo "${ECHO_T}none" >&6; }
+fi
+CLANGPATH=$WITH_CLANGPATH
+
+CLANGXXPATH=$WITH_CLANGXXPATH
+
+ENABLE_BUILT_CLANG=$WITH_BUILT_CLANG
+
+
+