CMake: build consistently with default (unspecified) target

Builds/CMake/CMakeFuncs.cmake

@@ -12,13 +12,17 @@ endif()
 
 macro(parse_target)
 
-  if (NOT target AND NOT CMAKE_BUILD_TYPE)
+  if (NOT target)
+    if (NOT CMAKE_BUILD_TYPE)
+      set(CMAKE_BUILD_TYPE Debug)
+    endif()
+    string(TOLOWER ${CMAKE_BUILD_TYPE} target)
     if (APPLE)
-      set(target clang.debug)
+      set(target clang.${target})
     elseif(WIN32)
       set(target msvc)
     else()
-      set(target gcc.debug)
+      set(target gcc.${target})
     endif()
   endif()
 
@@ -105,6 +109,7 @@ macro(parse_target)
       endif()
 
     endwhile()
+  endif()
   # Promote these values to the CACHE, then unset the locals
   # to prevent shadowing.
   set(CMAKE_C_COMPILER ${CMAKE_C_COMPILER} CACHE FILEPATH
@@ -139,7 +144,6 @@ macro(parse_target)
     "Choose the type of build, options are in CMAKE_CONFIGURATION_TYPES"
     FORCE)
   unset(CMAKE_BUILD_TYPE)
-  endif()
 
 endmacro()