On Wednesday, 19 October 2016 at 10:21:43 UTC, Dejan Lekic wrote:
because GDC is not yet merged into GCC.
there is absolutely no reason to do this. while today the question of syncing gdc frontend with dmd is only a question of manpower, with such a merge gdc will *always* be behind, stucked with old versions. and for D this is critical, as each new D version brings something better, fix some bugs and so on. it's not like C, for example, for which you don't have new language/stdlib release each several monthes.
tl;dr: if gdc will be merged to gcc, it will be bad for D, and unrecoverable death for gdc.