Turn on ENABLE_UNITY_BUILD in cmake by default.

Author: wps132230

CMakeLists.txt

@@ -43,7 +43,7 @@ find_package(Git)
 #   AWS_SDK_ADDITIONAL_LIBRARIES - names of additional libraries to link into aws-cpp-sdk-core in order to support unusual/unanticipated linking setups (static curl against static-something-other-than-openssl for example)
 
 # TODO: convert boolean invocation variables to options
-option(ENABLE_UNITY_BUILD "If enabled, the SDK will be built using a single unified .cpp file for each service library.  Reduces the size of static library binaries on Windows and Linux" OFF)
+option(ENABLE_UNITY_BUILD "If enabled, the SDK will be built using a single unified .cpp file for each service library.  Reduces the size of static library binaries on Windows and Linux" ON)
 option(MINIMIZE_SIZE "If enabled, the SDK will be built via a unity aggregation process that results in smaller static libraries; additionally, release binaries will favor size optimizations over speed" OFF)
 option(BUILD_SHARED_LIBS "If enabled, all aws sdk libraries will be build as shared objects; otherwise all Aws libraries will be built as static objects" ON)
 option(FORCE_SHARED_CRT "If enabled, will unconditionally link the standard libraries in dynamically, otherwise the standard library will be linked in based on the BUILD_SHARED_LIBS setting" ON)

README.md

@@ -184,7 +184,7 @@ For more information, see the CMake documentation for your platform.
 CMake options are variables that can either be ON or OFF, with a controllable default.  You can set an option either with CMake Gui tools or the command line via -D.
 
 #### ENABLE_UNITY_BUILD
-(Defaults to OFF) If enabled, most SDK libraries will be built as a single, generated .cpp file.  This can significantly reduce static library size as well as speed up compilation time.
+(Defaults to ON) If enabled, most SDK libraries will be built as a single, generated .cpp file.  This can significantly reduce static library size as well as speed up compilation time.
 
 #### MINIMIZE_SIZE
 (Defaults to OFF) A superset of ENABLE_UNITY_BUILD, if enabled this option turns on ENABLE_UNITY_BUILD as well as some additional binary size reduction settings.  This is a work-in-progress and may change in the future (symbol stripping in particular).