Use per-target CMake properties

CMakeLists.txt

@@ -1,15 +1,12 @@
 cmake_minimum_required(VERSION 3.15)
 project(cpp_channel VERSION 1.3.1)
 
-set(CMAKE_CXX_STANDARD 11 CACHE STRING "C++ standard")
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-set(CMAKE_CXX_EXTENSIONS OFF)
-
 list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")
 include(warnings)
 
 add_library(msd_channel INTERFACE)
 target_include_directories(msd_channel INTERFACE include)
+target_compile_features(msd_channel INTERFACE cxx_std_11)
 
 option(CPP_CHANNEL_BUILD_TESTS "Build all of cpp_channel's own tests." OFF)
 option(CPP_CHANNEL_BUILD_BENCHMARKS "Build all of cpp_channel's own benchmark tests." OFF)
@@ -18,6 +15,10 @@ option(CPP_CHANNEL_COVERAGE "Generate test coverage." OFF)
 option(CPP_CHANNEL_SANITIZERS "Build with sanitizers." OFF)
 option(CPP_CHANNEL_SANITIZE_THREADS "Build with thread sanitizer." OFF)
 
+function(cpp_channel_configure_target TARGET)
+    set_target_properties(${TARGET} PROPERTIES CXX_STANDARD_REQUIRED ON CXX_EXTENSIONS OFF)
+endfunction()
+
 if(CPP_CHANNEL_BUILD_TESTS)
     enable_testing()
     add_subdirectory(tests)

benchmarks/CMakeLists.txt

@@ -10,6 +10,8 @@ endif()
 
 function(package_add_benchmark TESTNAME)
     add_executable(${TESTNAME} ${ARGN})
+    cpp_channel_configure_target(${TESTNAME})
+
     set_target_warnings(${TESTNAME} PRIVATE)
     target_link_libraries(${TESTNAME} msd_channel benchmark)
 endfunction()

examples/CMakeLists.txt

@@ -1,5 +1,6 @@
 function(add_example NAME)
     add_executable(${NAME} ${ARGN})
+    cpp_channel_configure_target(${NAME})
 
     set_target_warnings(${NAME} PRIVATE)
     target_link_libraries(${NAME} msd_channel)

tests/CMakeLists.txt

@@ -19,6 +19,7 @@ endif()
 # Test macro
 function(package_add_test TESTNAME)
     add_executable(${TESTNAME} ${ARGN})
+    cpp_channel_configure_target(${TESTNAME})
 
     set_target_warnings(${TESTNAME} PRIVATE)
     target_link_libraries(${TESTNAME} msd_channel gtest gtest_main)