"-fmodules" flag was disabled as a fix to this bug report:

On 24 August 2016 at 21:49, Piotr Wach <wach.piot...@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
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