[CMake] Can not get C++ 11 support enabled

[Michael Ellery]

> On Jul 10, 2017, at 10:07 PM, Florian Lindner <mailinglists at xgm.de> wrote:
> 
> Hello,
> 
> my complete cmake file looks like that:
> 
> cmake_minimum_required (VERSION 3.1)
> project(Preallocation)
> add_executable(prealloc prealloc_parallel.cpp)
> 
> set(CMAKE_CXX_STANDARD 11)
> set(CMAKE_CXX_STANDARD_REQUIRED ON)
> add_compile_options(-std=c++11)
> 
> find_library(petsc petsc
>  PATHS $ENV{PETSC_DIR}/$ENV{PETSC_ARCH}/lib)
> if(NOT petsc)
>  message(FATAL_ERROR "petsc was not found")
> endif()
> target_link_libraries(prealloc ${petsc})
> 
> find_package(Boost 1.60.0
>  REQUIRED
>  COMPONENTS program_options)
> target_link_libraries(prealloc ${Boost_LIBRARIES})
> 
> find_package(MPI
>  REQUIRED)
> target_link_libraries(prealloc ${MPI_LIBRARIES})
> 
> set(COMPILE_FLAGS  ${COMPILE_FLAGS} ${MPI_COMPILE_FLAGS})
> set(LINK_FLAGS ${LINK_FLAGS} ${MPI_LINK_FLAGS})
> 

I would try moving the add_executable() to the end of the CMakeLists file (after the set() and find_library calls…)

-Mike