Remove BENCHMARK_ENABLE_SHARED and prefer BUILD_SHARED_LIBS

CMakeLists.txt

 cmake_minimum_required (VERSION 2.8)
 project (benchmark)
 
-option(BENCHMARK_ENABLE_SHARED  "Enable building a shared library." OFF)
 option(BENCHMARK_ENABLE_TESTING "Enable testing of the benchmark library." ON)
 # Make sure we can import out CMake functions
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

appveyor.yml

@@ -42,7 +42,7 @@ before_build:
   - if "%generator%"=="MinGW Makefiles" (set "PATH=%PATH:C:\Program Files (x86)\Git\bin=%")
 
 build_script:
-  - cmake -G "%generator%" "-DCMAKE_BUILD_TYPE=%variant%" "-DBENCHMARK_ENABLE_SHARED=%shared%"
+  - cmake -G "%generator%" "-DCMAKE_BUILD_TYPE=%variant%" "-DBUILD_SHARED_LIBS=%shared%"
   - cmd /c "%build%"
 
 test_script:

src/CMakeLists.txt

@@ -17,13 +17,12 @@ else()
   message(FATAL_ERROR "Failed to determine the source files for the regular expression backend")
 endif()
 
+add_library(benchmark ${SOURCE_FILES} ${RE_FILES})
+
 # Build the benchmark library
-if (BENCHMARK_ENABLE_SHARED)
-  add_library(benchmark SHARED ${SOURCE_FILES} ${RE_FILES})
+if (BUILD_SHARED_LIBS)
   find_package(Threads REQUIRED)
   target_link_libraries(benchmark ${CMAKE_THREAD_LIBS_INIT})
-else()
-  add_library(benchmark STATIC ${SOURCE_FILES} ${RE_FILES})
 endif()
 
 set_target_properties(benchmark PROPERTIES