Backport of JDK-8249672 ("Include microcode revision in features_string") to JDK-11.0.10 breaks compiling it on Oracle Solaris 11.4

[Thomas Stüfe]

Hi Steffen,

(compiler-dev -> runtime-dev)

Thanks for reporting this. I opened
https://bugs.openjdk.java.net/browse/JDK-8265417 to track this issue. I
guess not many people build Solaris x86.

We should at least stub out the method for Solaris x86 to get the build
going. I am not sure it is  worth the cycles to actually implement this,
since Solaris is obsolete and Solaris x86 is such a niche platform. But we
should keep the build intact.

The backport was done by Oracle. I am not sure if Solaris x86 is a
supported platform, and if it is regularly tested. Does not seem that way.

Cheers Thomas



On Sun, Apr 18, 2021 at 1:54 PM Steffen Moser <lists at steffen-moser.de>
wrote:

> Hi all,
>
> I am new into JDK contribution/bug reporting, so I really hope I've
> chosen the right way to report a bug - at least I could neither find a
> possibility to register for openjdk.java.net nor did my Oracle SSO
> account work on this site.
>
> Bug report: In JDK-8249672, the microcode version of an x86 CPU was
> added to the "features_string" printed in an hs_err_pidXXXXX log file.
> As far as I know, it was introduced to JDK-16 and back-ported to both,
> JDK-15 and JDK-11 last year. While Solaris support was (unfortunately)
> abandoned in JDK-15, JDK-11 still supports and should further support
> Solaris on both SPARC and x86 if my information is correct.
>
> I desperately need JDK-11 (and probably newer versions of Java) in order
> to run several modern open-source tools. When trying to compile JDK-11
> on Solaris 11.4 SRU 31 on x86 according to [1] and [2], I run into the
> following compile error problem:
>
>     "./src/hotspot/cpu/x86/vm_version_x86.cpp", line 753: Error:
> cpu_microcode_revision is not a member of os.
>     1 Error(s) detected.
>
> The reason is quite obvious. The method
>
>     os::cpu_microcode_revision()
>
> is not defined for the Solaris platform as JDK-8249672 does not alter
>
>     src/hotspot/os_cpu/solaris_x86/os_solaris_x86.hpp
>     src/hotspot/os_cpu/solaris_x86/os_solaris_x86.cpp
>
> The question is: How should we fix it? Is it allowed to call Solaris'
>
>     /usr/sbin/ucodeadm -v
>
> and parse this binary's results or do we have to get the contents from
> "/dev/ucode" (which seems to be the symlink to the pseudo-device
> "/devices/pseudo/ucode at 0:ucode" and is accessed by ucodeadm) manually?
>
> Any help to make JDK 11 compiling on Solaris 11.4/x86 again would be
> highly appreciated. Thank you very much in advance!
>
> Kind regards,
> Steffen
>
> [1] https://blogs.oracle.com/solaris/building-openjdk-12-using-jdk-8
> [2]
>
> http://notallmicrosoft.blogspot.com/2020/04/building-openjdk-13-and-openjdk-14-on.html
>