CMake: Detect dotty.

Patch by Arnaud Allard de Grandmaison!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86153 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index 9351f26..d67eaf7 100755
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -126,6 +126,15 @@
 check_type_exists(uint64_t "${headers}" HAVE_UINT64_T)
 check_type_exists(u_int64_t "${headers}" HAVE_U_INT64_T)
 
+# available programs checks
+find_program(DOTTY_EXECUTABLE dotty)
+if(DOTTY_EXECUTABLE)
+  set(HAVE_DOTTY 1)
+  set(LLVM_PATH_DOTTY ${DOTTY_EXECUTABLE})
+  mark_as_advanced(HAVE_DOTTY)
+  mark_as_advanced(LLVM_PATH_DOTTY)
+endif()
+
 # Define LLVM_MULTITHREADED if gcc atomic builtins exists.
 include(CheckAtomic)