[cfe-dev] Precompiled headers

[Reid Kleckner via cfe-dev]

On Fri, Dec 11, 2015 at 10:26 AM, Richard Smith via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> -Xclang passes only the immediately following argument to cc1. You need
>
> clang-cl -fms-compatibility-version=19 -Xclang -include-pch -Xclang
> a.h.gch a.cpp
>
> Also, the -Xclang / -cc1 interface is not really supported and has no
> stability guarantees; do the cl.exe flags for PCH not work in clang-cl? (If
> not, please file a bug on that.)
>
Nico was going to take a shot at making the /Y preprocessor flags work with
clang-cl, but I don't think he got around to it. I think it's not as easy
as adding more aliases, you have to add some driver logic.
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