[Openmp-dev] Offloading application build with a Trunk Debug Clang is so slow

[Itaru Kitayama via Openmp-dev]

The app build time increases can be reproduced with a simple int main() {}
code.

On Thu, Dec 19, 2019 at 5:02 Jon Chesterfield <
jonathanchesterfield at gmail.com> wrote:

> On Wed, 18 Dec 2019, 19:51 Doerfert, Johannes, <jdoerfert at anl.gov> wrote:
>
>> On 12/18, Itaru Kitayama via Openmp-dev wrote:
>> > I've been using a Trunk Debug Clang that can print out libomptarget
>> > debugging
>> > information, but I noticed in the last couples of days the built time
>> > increased
>> > significantly to an hour or so. While a non Debug clang builds my app
>> in a
>> > few
>> > minutes.
>> > Has anyone committed intrusive changed recently to the library?
>>
>> Jon, do you know if something happened that could explain this?
>>
>
>  Hey,
>
> The patches that landed in the last few days are all moving existing
> functions behind a single call. The only vaguely interesting one for clang
> is D71580 in that it uses templates that dispatch to cuda's min function,
> but even that seems unlikely to change compile time.
>
> It's 7k of pretty trivial C++, so taking over an hour to build doesn't
> sound right. Have you tried rolling the deviceRTL back by a few days and
> building with your current debug toolchain? I'm wondering if trunk clang's
> debug build has regressed in performance.
>
> Thanks
>
> Jon
>
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