[crac] RFR: 8376959: [CRaC] Turn simengine into shared library [v2]

[Radim Vansa]

On Tue, 3 Feb 2026 11:42:21 GMT, Timofei Pushkin <tpushkin at openjdk.org> wrote:

>> Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Implement static build & other platforms
>
> src/hotspot/share/runtime/crac_engine.cpp line 116:
> 
>> 114:     assert(sizeof(SIMENGINE) <= resolved_engine_size, "must be");
>> 115:     memcpy(resolved_engine, SIMENGINE, sizeof(SIMENGINE));
>> 116:     log_warning(crac)("-XX:CRaCEngine=pause/pauseengine is deprecated; use -XX:CRaCEngine=simengine -XX:CRaCEngineOptions=pause=true");
> 
> Let's define an obsoletion/expiration version for this. I suggest 28 for both obsoletion and expiration: this way for LTS releases it will be deprecated in April 2026 and obsoleted+expired in April 2027.
> 
> Suggestion:
> 
>   assert(JDK_Version::current().compare(JDK_Version::jdk(28)) < 0, "pauseengine handling must be removed as obsolete");
>   if (is_pauseengine()) {
>     assert(sizeof(SIMENGINE) <= resolved_engine_size, "must be");
>     memcpy(resolved_engine, SIMENGINE, sizeof(SIMENGINE));
>     log_warning(crac)("Option '-XX:CRaCEngine=pauseengine' was deprecated in version 27 and will be removed in version 28. Use options '-XX:CRaCEngine=simengine -XX:CRaCEngineOptions=pause=true' instead.");

April 2026 is 27, a STS version, and 28 is STS as well (not that it would matter so much in CRaC - we haven't been updating the older branches anyway). I am OK to expire this in 28, though.

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PR Review Comment: https://git.openjdk.org/crac/pull/289#discussion_r2759409193