Simplified the cmake files by putting the stuff to make Release

the default build into a single file.

dlib/release_build_by_default

+
+#set default build type to Release
+if(NOT CMAKE_BUILD_TYPE)
+   set(CMAKE_BUILD_TYPE "Release" CACHE STRING
+      "Choose the type of build, options are: Debug Release
+      RelWithDebInfo MinSizeRel." FORCE)
+endif()
+
+

examples/CMakeLists.txt

@@ -13,11 +13,7 @@ endif()
 
 
 #set default build type to Release
-if(NOT CMAKE_BUILD_TYPE)
-   set(CMAKE_BUILD_TYPE "Release" CACHE STRING
-      "Choose the type of build, options are: Debug Release
-      RelWithDebInfo MinSizeRel." FORCE)
-endif()
+include(../dlib/release_build_by_default)
 
 
 

tools/htmlify/CMakeLists.txt

@@ -41,9 +41,5 @@ INSTALL(TARGETS ${target_name}
 
 
 #set default build type to Release
-if(NOT CMAKE_BUILD_TYPE)
-   set(CMAKE_BUILD_TYPE "Release" CACHE STRING
-      "Choose the type of build, options are: Debug Release
-      RelWithDebInfo MinSizeRel." FORCE)
-endif()
+include(../../dlib/release_build_by_default)
 

tools/imglab/CMakeLists.txt

@@ -39,11 +39,5 @@ INSTALL(TARGETS ${target_name}
 	RUNTIME DESTINATION bin
 	)
 
-
 #set default build type to Release
-if(NOT CMAKE_BUILD_TYPE)
-   set(CMAKE_BUILD_TYPE "Release" CACHE STRING
-      "Choose the type of build, options are: Debug Release
-      RelWithDebInfo MinSizeRel." FORCE)
-endif()
-
+include(../../dlib/release_build_by_default)

tools/mltool/CMakeLists.txt

@@ -41,11 +41,6 @@ INSTALL(TARGETS ${target_name}
 	RUNTIME DESTINATION bin
 	)
 
-
 #set default build type to Release
-if(NOT CMAKE_BUILD_TYPE)
-   set(CMAKE_BUILD_TYPE "Release" CACHE STRING
-      "Choose the type of build, options are: Debug Release
-      RelWithDebInfo MinSizeRel." FORCE)
-endif()
+include(../../dlib/release_build_by_default)