CMake 2.8.0 compatibility.

cmake/Modules/FindLLVM.cmake

@@ -110,6 +110,12 @@ string(REGEX REPLACE "[0-9]+\\.([0-9]+).*[A-Za-z]*" "\\1" LLVM_VERSION_MINOR "${
 
 # Use the default CMake facilities for handling QUIET/REQUIRED.
 include(FindPackageHandleStandardArgs)
+
+if(${CMAKE_VERSION} VERSION_LESS "2.8.4")
+  # The VERSION_VAR argument is not supported on pre-2.8.4, work around this.
+  set(VERSION_VAR dummy)
+endif()
+
 find_package_handle_standard_args(LLVM
     REQUIRED_VARS LLVM_ROOT_DIR LLVM_HOST_TARGET
     VERSION_VAR LLVM_VERSION_STRING)

tests/d2/CMakeLists.txt

@@ -19,8 +19,7 @@ function(add_testsuite config_name dflags)
     # testsuite build system provides no way to run the test cases with a
     # given set of flags without trying all combinations of them.
     add_test(NAME ${name}
-        WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/tests/d2/dmd-testsuite
-        COMMAND ${CMAKE_MAKE_PROGRAM} RESULTS_DIR=${outdir} DMD=${ldmd_path} DFLAGS=${dflags} MODEL=${model} quick
+        COMMAND ${CMAKE_MAKE_PROGRAM} -C ${PROJECT_SOURCE_DIR}/tests/d2/dmd-testsuite RESULTS_DIR=${outdir} DMD=${ldmd_path} DFLAGS=${dflags} MODEL=${model} quick
     )
     set_tests_properties(${name} PROPERTIES DEPENDS ${name}_clean)
 endfunction()