[cmake-developers] RFC: CMake precompiled header support and custom compiler based implementation

[Taylor Braun-Jones]

What's the status of this PCH feature? Does it need testers? More design
input? I'd love to see this feature in a future CMake release. Willing to
help.

Cheers,
Taylor

On Fri, Mar 20, 2015 at 3:56 PM, Daniel Pfeifer <daniel at pfeifer-mail.de>
wrote:

> On Fri, Mar 20, 2015 at 6:35 PM, Amine Khaldi <amine.khaldi at reactos.org>
> wrote:
> > Two requests please:
> >
> > * The option to use existing headers instead of autogenerated ones.
>
> That is an implementation detail. It should not make a difference
> whether the precompiled header is used through your existing header or
> through an autogenerated header that forward includes your existing
> header. This forward inclusion is important at least for GCC: The
> compiler searches for a .gch file in the same directory as the header
> file. Since we do not want this .gch file to be generated in the
> source directory for out-of-source builds, we need to put the header
> file into the build directory.
>
> Did I misunderstand your request and you meant "use an existing
> *precompiled* header", ie. provide a .pch or .gch file?
> My approach currently does not support that. Please let me know if
> that is what you meant.
>
> > * Implementing PCH support without additional targets. ReactOS already
> has like 1000+ targets, and we currently use PCH on almost all of them, so
> imagine if this official implementation doubles our targets number.
>
> I completely agree.
>
> One request that I can add:
>
> * It shall be visible in the IDE's settings that precompiled headers are
> used.
>
> Cheers, Daniel
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