Why std lib from GDC is not the same that phobos from DMD

Question

For example, I can not compile using GDC 5.2.0 (2016-02-05T11:17:49.3234388) a program importing std.meta because that file is not found.

I was comparing the include folders between GDC and DMD and I found a great mismatch of versions.

\lib\gcc\x86_64-w64-mingw32\5.2.0\include\d\std     from GDC  5.2.0 
dmd2\src\phobos\std                                 from DMD2 2.070.0

This preventing that I can use GDC with confidence.

Anyone knows why includes of GDC are not the same Phobos library?

Answer 1

GDC and LDC lag behind DMD, as adapting the latest DMD changes with the respective compiler backends takes some time.

Note the DMDFE column on the downloads page:

It indicates which DMD version the corresponding release is based on.