[ccache] clang modules (-fmodules) support

[Piotr Wach]

"-fmodules" flag was disabled as a fix to this bug report:
https://bugzilla.samba.org/show_bug.cgi?id=11048

On 24 August 2016 at 21:49, Piotr Wach <wach.piotrek at gmail.com> wrote:

> Hello,
>
> we experiment with clang modules in quite large C++ code base to improve
> build times.
>
> I have seen that "-fmodules" compiler flag has been recently marked as
> "hard" / unsupported (?) - is this because no one had time to implement it
> or are there real problems with supporting it in ccache?
>
> I want to try to add support for clang modules to ccache. However, I first
> would like to know if someone has already tried, and it turned out to be
> not possible and what were the problems with doing it.
>
>
> Piotr Wach
>