Facebook Has Been Working On C++ Modules Support For GCC Written by Michael Larabel in Standards on 8 October 2017 at 08:29 AM EDT. 26 Comments For C++20 the long-awaited modules system is likely to finally land. Facebook engineers have been working on a C++ modules implementation already for the GNU Compiler Collection. Since LLVM Clang 5.0 has been an experimental C++ modules implementation ther