Does the openwrt toolchain support gnu++1z?
I'm facing the issue of c++: error: unrecognized command line option '-std=gnu++1z
I already tried gnu++1y and this works with gcc9. Can I somehow enable it?
I found something interesting: https://studiofreya.com/cpp/concepts/building-gcc-with-concepts-lite/
Not sure where I have to place -fconcepts.