Warn developers when no CMAKE_BUILD_TYPE is set, and default to RelWithDebInfo

CMakeLists.txt

@@ -7,6 +7,16 @@ set (SuperBuild_BINARY_DIR ${VeloViewSuperBuild_BINARY_DIR})
 
 include(CMakeDependentOption)
 
+#------------------------------------------------------------------------------
+# Set a default build type if none was specified
+if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+  message(STATUS "Setting build type to 'RelWithDebInfo' as none was specified.")
+  set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING "Choose the type of build." FORCE)
+  # Set the possible values of build type for cmake-gui
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release"
+    "MinSizeRel" "RelWithDebInfo")
+endif()
+
 #-----------------------------------------------------------------------------
 # Collect information about the build platform.
 include(CheckTypeSize)