Stop using precompiled headers for Linux? (original) (raw)

Aleksey Shipilev shade at redhat.com
Tue Oct 30 20:17:14 UTC 2018

On 10/30/2018 06:26 PM, Ioi Lam wrote:

Is there any advantage of using precompiled headers on Linux?

I have measured it recently on shenandoah repositories, and fastdebug/release build times have not improved with or without PCH. Actually, it gets worse when you touch a single header that is in PCH list, and you end up recompiling the entire Hotspot. I would be in favor of disabling it by default.

It's on by default and we keep having breakage where someone would forget to add #include. The latest instance is JDK-8213148.

Yes, we catch most of these breakages in CIs. Which tells me adding it to jdk-submit would cover most of the breakage during pre-integration testing.

-Aleksey

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