configure.ac: Don't set LLVM_LIBS when llvm is disabled

configure.ac

@@ -1898,21 +1898,23 @@ dnl by calling llvm-config --libs ${DRIVER_LLVM_COMPONENTS}, but
 dnl this was causing the same libraries to be appear multiple times
 dnl in LLVM_LIBS.
 
-LLVM_LIBS="`$LLVM_CONFIG --libs ${LLVM_COMPONENTS}`"
+if test "x$MESA_LLVM" != x0; then
 
-if test "x$with_llvm_shared_libs" = xyes; then
-    dnl We can't use $LLVM_VERSION because it has 'svn' stripped out,
-    LLVM_SO_NAME=LLVM-`$LLVM_CONFIG --version`
-    AC_CHECK_FILE("$LLVM_LIBDIR/lib$LLVM_SO_NAME.so", llvm_have_one_so=yes,)
+    LLVM_LIBS="`$LLVM_CONFIG --libs ${LLVM_COMPONENTS}`"
 
-    if test "x$llvm_have_one_so" = xyes; then
-        dnl LLVM was built using auto*, so there is only one shared object.
-        LLVM_LIBS="-l$LLVM_SO_NAME"
-    else
-        dnl If LLVM was built with CMake, there will be one shared object per
-        dnl component.
-        AC_CHECK_FILE("$LLVM_LIBDIR/libLLVMTarget.so",,
-                AC_MSG_ERROR([Could not find llvm shared libraries:
+    if test "x$with_llvm_shared_libs" = xyes; then
+        dnl We can't use $LLVM_VERSION because it has 'svn' stripped out,
+        LLVM_SO_NAME=LLVM-`$LLVM_CONFIG --version`
+        AC_CHECK_FILE("$LLVM_LIBDIR/lib$LLVM_SO_NAME.so", llvm_have_one_so=yes,)
+
+        if test "x$llvm_have_one_so" = xyes; then
+            dnl LLVM was built using auto*, so there is only one shared object.
+            LLVM_LIBS="-l$LLVM_SO_NAME"
+        else
+            dnl If LLVM was built with CMake, there will be one shared object per
+            dnl component.
+            AC_CHECK_FILE("$LLVM_LIBDIR/libLLVMTarget.so",,
+                    AC_MSG_ERROR([Could not find llvm shared libraries:
 	Please make sure you have built llvm with the --enable-shared option
 	and that your llvm libraries are installed in $LLVM_LIBDIR
 	If you have installed your llvm libraries to a different directory you
@@ -1925,9 +1927,10 @@ if test "x$with_llvm_shared_libs" = xyes; then
 	use llvm static libraries then remove these options from your configure
 	invocation and reconfigure.]))
 
-       dnl We don't need to update LLVM_LIBS in this case because the LLVM
-       dnl install uses a shared object for each compoenent and we have
-       dnl already added all of these objects to LLVM_LIBS. 
+           dnl We don't need to update LLVM_LIBS in this case because the LLVM
+           dnl install uses a shared object for each compoenent and we have
+           dnl already added all of these objects to LLVM_LIBS.
+        fi
     fi
 fi