Changing CMAKE_CXX_FLAGS in project

Question

I have the following content in my CMakeLists.txt:

project( Matfile )

SET ( CMAKE_CXX_FLAGS \"-std=c++0x\" )

set ( SOURCES
      \"foo.cpp\"
      \"bar.cp         


        

Answer 1

The correct way to set the C++ standard in CMake 3.1 and later is:

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED on)

It is possible to specify the standard for one individual target also:

set_property(TARGET mylib PROPERTY CXX_STANDARD 11)

Since CMake 3.8 there is a new option to the target_compile_features command that allows to set the required standard for a target:

target_compile_features(mylib PUBLIC cxx_std_11)

The advantage would be that it propagates the requirement to dependent targets. If you compile a library with the cxx_std_11 required feature, any binary that links to it will automatically have this requirement set.