Stop using precompiled headers for Linux?

Magnus Ihse Bursie magnus.ihse.bursie at
Sat Nov 3 08:51:08 UTC 2018

On 2018-10-30 20:21, Erik Joelsson wrote:
> Last I checked, it did provide significant build speed improvements 
> when building just hotspot, but that could need revisiting.
> We do have verification of --disable-precompiled-headers (in 
> slowdebug) in builds-tier2 so we normally get notified if this fails. 
> However, Mach5 has not been running since Friday so this particular 
> bug wasn't detected automatically. Looking at the bug, it also failed 
> on Solaris, which would have been caught by tier1 builds.

If we decide to keep precompiled headers on by default, maybe we should 
add a simple no-PCH verification task in tier1? It only needs to build 
hotspot, so it should be quick.


> /Erik
> On 2018-10-30 10:26, Ioi Lam wrote:
>> Is there any advantage of using precompiled headers on Linux? It's on 
>> by default and we keep having breakage where someone would forget to 
>> add #include. The latest instance is JDK-8213148.
>> I just turn on precompiled headers explicitly in all my builds. I 
>> don't see any difference in build time (at least not significant 
>> enough for me to bother).
>> Should we disable it by default on Linux?
>> Thanks
>> - Ioi

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