In pkgsrc, GNU Radio is at 3.10.12.0. It is marked as needing a C++20 compiler, but this seems surprising. This minute, I believe that's confused on our part, and it needs C++17.
Reading CMakeFile.txt and README and following pointers, I can't find anything which says what C++ language variant GNU Radio is written in, and whether the build environment needs to force that, vs letting the gr build system test if --std=c++NN works and then adding it. I find experimentally that building gr-osmosdr with a forced --std=c++11 fails due to things in the gnuradio headers, apparently, and with a forced --std=c++17 it builds. I find the same thing with our gnuradio-core package which is the normal key blocks split from everything. My questions: Is this documented and I'm just not looking in the right place? What C++ language variant is GNU Radio 3.10.12 written in? Does the build system check if the compiler can support the required version and add --std somehow? If not, do people think that's a bug? Are things ok only because everybody but me is using a system where the compiler is always really recent, and defaults to high language standards? Thanks Greg
