Set CMAKE_BUILD_TYPE default on win32 too

CMakeLists.txt

@@ -1,6 +1,13 @@
 # vim: et ts=4 sts=4 sw=4 tw=0
 
 CMAKE_MINIMUM_REQUIRED(VERSION 3.1)
+
+# Ensures that CMAKE_BUILD_TYPE has a default value
+IF(NOT DEFINED CMAKE_BUILD_TYPE)
+    SET(CMAKE_BUILD_TYPE Release CACHE STRING
+        "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel Coverage.")
+ENDIF()
+
 PROJECT(jsoncpp)
 ENABLE_TESTING()
 
@@ -12,15 +19,6 @@ OPTION(JSONCPP_WITH_PKGCONFIG_SUPPORT "Generate and install .pc files" ON)
 OPTION(JSONCPP_WITH_CMAKE_PACKAGE "Generate and install cmake package files" ON)
 OPTION(BUILD_SHARED_LIBS "Build jsoncpp_lib as a shared library." OFF)
 
-# Ensures that CMAKE_BUILD_TYPE is visible in cmake-gui on Unix
-IF(NOT WIN32)
-    IF(NOT CMAKE_BUILD_TYPE)
-        SET(CMAKE_BUILD_TYPE Release CACHE STRING
-            "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel Coverage."
-            FORCE)
-    ENDIF()
-ENDIF()
-
 # Enable runtime search path support for dynamic libraries on OSX
 IF(APPLE)
     SET(CMAKE_MACOSX_RPATH 1)

appveyor.yml

@@ -10,7 +10,7 @@ environment:
 build_script:
   - cmake --version
   - cd c:\projects\jsoncpp
-  - cmake -G "%CMAKE_GENERATOR%" -DCMAKE_INSTALL_PREFIX=%CD:\=/%/install -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON .
+  - cmake -G "%CMAKE_GENERATOR%" -DCMAKE_INSTALL_PREFIX=%CD:\=/%/install -DBUILD_SHARED_LIBS=ON .
   - cmake --build . --config Release --target install
 
 deploy: