Use target_compile_features to specify the C++11 requirement (#645)

Author: traversaro

CMakeModules/CompilerSettings.cmake

@@ -33,15 +33,15 @@
 
 # GCC
 if(CMAKE_COMPILER_IS_GNUCXX)
-    add_definitions(-std=c++11 -W -Wall -Wextra -Wpedantic)
+    add_definitions(-W -Wall -Wextra -Wpedantic)
     if(FCL_TREAT_WARNINGS_AS_ERRORS)
         add_definitions(-Werror)
     endif()
 endif()
 
 # Clang
 if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
-    add_definitions(-std=c++11 -W -Wall -Wextra)
+    add_definitions(-W -Wall -Wextra)
     if(FCL_TREAT_WARNINGS_AS_ERRORS)
         add_definitions(-Werror)
     endif()
@@ -53,7 +53,7 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
     if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.1)
         message(FATAL_ERROR "AppleClang version must be at least 6.1!")
     endif()
-    add_definitions(-std=c++11 -W -Wall -Wextra)
+    add_definitions(-W -Wall -Wextra)
     if(FCL_TREAT_WARNINGS_AS_ERRORS)
         add_definitions(-Werror)
     endif()
@@ -77,7 +77,7 @@ else()
     set(IS_ICPC 0)
 endif()
 if(IS_ICPC)
-    add_definitions(-std=c++11 -wd191 -wd411 -wd654 -wd1125 -wd1292 -wd1565 -wd1628 -wd2196)
+    add_definitions(-wd191 -wd411 -wd654 -wd1125 -wd1292 -wd1565 -wd1628 -wd2196)
     set(CMAKE_AR "xiar" CACHE STRING "Intel archiver" FORCE)
     set(CMAKE_CXX_FLAGS "-pthread" CACHE STRING "Default compile flags" FORCE)
     set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG"
@@ -97,7 +97,7 @@ else()
     set(IS_XLC 0)
 endif()
 if(IS_XLC)
-    add_definitions(-std=c++11 -qpic -q64 -qmaxmem=-1)
+    add_definitions(-qpic -q64 -qmaxmem=-1)
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -q64")
     set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -q64")
 endif()

src/CMakeLists.txt

@@ -50,6 +50,9 @@ endif()
 # Be sure to pass to the consumer the set of SIMD used in the compilation
 target_compile_options(${PROJECT_NAME} PUBLIC ${SSE_FLAGS})
 
+# At least C++11 is required
+target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_11)
+
 set_target_properties(${PROJECT_NAME} PROPERTIES
   VERSION ${FCL_VERSION}
   SOVERSION ${FCL_ABI_VERSION})