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

[Craig Scott]

As well as moving the add_executable() call after you set the various
CMAKE_CXX... variables, you should also replace the call to
add_compile_options(-std=c++11) with the following:

set(CMAKE_CXX_EXTENSIONS OFF)


On Tue, Jul 11, 2017 at 3:11 PM, Michael Ellery <mellery451 at gmail.com>
wrote:

>
> > 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
>
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-- 
Craig Scott
Melbourne, Australia
https://crascit.com
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