Thanks.
I got around the issue by explicitly setting CMAKE_CXX_CFLAGS when I invoked
cmake.
Sent from my iPhone
> On Nov 25, 2019, at 10:19 AM, Michael Dickens <michael.dick...@ettus.com>
> wrote:
>
>
> If setting `CMAKE_CXX_STANDARD` doesn't work to get `-std=c++11` or
> `-std=gnu++11` into the CXX_FLAGS, then maybe the version of CMake is < 3.1.0?
>
> The variable `CMAKE_CXX_STANDARD` was added to CMake in the capacity of
> setting (e.g.) `-std=c++11` as of CMake 3.1.0. The code would be something
> like:
> {{{
> # If cmake version is < 3.1, explicitly set C/C++ standard to use;
> # this CMake doesn't internally use CMAKE_C*_STANDARD variables.
>
> IF(${CMAKE_VERSION} VERSION_LESS 3.1)
> SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c${CMAKE_C_STANDARD}")
> SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++${CMAKE_CXX_STANDARD}")
> ENDIF()
> }}}
>
> Worth a try! - MLD
>
>> On Sun, Nov 24, 2019 at 5:22 PM Marcus D. Leech <patchvonbr...@gmail.com>
>> wrote:
>> Playing with a project (gr-radio_astro from WVURAIL:
>> https://github.com/WVURAIL/gr-radio_astro), and running into compile
>> issues on
>> older OS (Fedora 20 in this case).
>>
>> Now, the interesting thing is that my GCC appears to have support for
>> c++11 (since -std=c++11 works as a command arg), and despite the
>> fact that the CMakelists.txt file for the project includes:
>>
>> ########################################################################
>> # Compiler specific setup
>> ########################################################################
>> if(CMAKE_COMPILER_IS_GNUCXX AND NOT WIN32)
>> #http://gcc.gnu.org/wiki/Visibility
>> add_definitions(-fvisibility=hidden)
>> set(CMAKE_CXX_STANDARD 11)
>> endif()
>>
>> There doesn't appear to be any use of -std=c++11 in the Make files
>> generated, and one gets compile errors for source that includes
>> C++11 features/syntax.
>>
>> Are there extra "sets" in the CMakeLists.txt that I should be using to
>> force it to use the c++11 compiler options?
>>
>> Cheers
> --
> Michael Dickens
> Ettus Research Technical Support
> Email: supp...@ettus.com
> Web: https://ettus.com/
