[cfe-commits] [PATCH] Add Clang driver-support for directory-style precompiled headers

[Tor Arne Vestbø]

On 15.10.10 22.12, Argyrios Kyrtzidis wrote:
> On Oct 15, 2010, at 12:04 PM, Tor Arne Vestbø wrote:
>
>> On 15.10.10 20.57, Argyrios Kyrtzidis wrote:
>>> This is less about supporting directory-style precompiled headers
>>> and more about supporting Qt's build system.
>>
>> Well, yes and no. I've successfully compiled Qt with Clang using
>> the solution you outline, but I figured I'd give it a shot at
>> fixing this upstream so other people could benefit from it.
>>
>> If it's too hacky (as I admit, it does not do what GCC does, which
>> is actually parse each header found in the PCH directory and choose
>> the first matching one for the input language) I'm fine with that
>> as well -- as you say we have a solution for Qt.
>
> I don't have a strong opinion either way but I lean towards not
> adding it because it's Qt specific. Deferring to Daniel since the
> driver is his department.

True, it's relying on the user naming their pch files after the input 
language, like Qt does.

If we don't want this patch in, would it make sense to warn the user and 
then ignore the directory-pch (and fall back to -include to pick up the 
real header) instead of "error: unable to read PCH file: 'Is a directory'"?

Tor Arne