8390432: Zero i386 build broken after JDK-8389219

[vpa1977]

This PR adds #ifdef statements around FLAG_SET_ERGO(UseCompressedOops, false);. UseCompressedOps is a boolean constant in 32 bit build.

bash configure --disable-warnings-as-errors --with-jvm-variants=zero --disable-precompiled-headers

...
A new configuration has been successfully created in
/home/vladimirp/work/git/jdk/build/linux-x86-zero-release
using configure arguments '--disable-warnings-as-errors --with-jvm-variants=zero'.


Configuration summary:
* Name:           linux-x86-zero-release
* Debug level:    release
* HS debug level: product
* JVM variants:   zero
* JVM features:   zero: 'cds dtrace epsilongc g1gc jni-check jvmti management parallelgc serialgc services shenandoahgc vm-structs zero' 
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 32
* Version string: 28-internal-adhoc.vladimirp.jdk (28-internal)
* Source date:    1787005914 (2026-08-17T22:31:54Z)

Tools summary:
* Boot JDK:       openjdk version "27-ea" 2026-09-15 OpenJDK Runtime Environment (build 27-ea+34-1-Debian) OpenJDK Zero VM (build 27-ea+34-1-Debian, interpreted mode, sharing) (at /usr/lib/jvm/java-27-openjdk-i386)
* Toolchain:      gcc (GNU Compiler Collection)
* C Compiler:     Version 16.2.0 (at /usr/bin/gcc)
* C++ Compiler:   Version 16.2.0 (at /usr/bin/g++)

Build performance summary:
* Build jobs:     32
* Memory limit:   62150 MB

...
make images CONF=linux-x86-zero-release
Building target 'images' in configuration 'linux-x86-zero-release'
....
Creating jdk/modules/jdk.jpackage/jdk/jpackage/internal/resources/jpackageapplauncher from 3 file(s)
Creating jdk/modules/jdk.jpackage/jdk/jpackage/internal/resources/libjpackageapplauncheraux.so from 19 file(s)
Error: Unable to load main class com.sun.tools.javac.Main in module jdk.compiler
Caused by: java.lang.VerifyError
gmake[3]: *** [modules/jdk.compiler/Gendata.gmk:60: /home/vladimirp/work/git/jdk/build/linux-x86-zero-release/buildtools/create_symbols_javac/_the.COMPILE_CREATE_SYMBOLS_batch] Error 1
gmake[2]: *** [make/Main.gmk:136: jdk.compiler-gendata] Error 2

ERROR: Build failed for target 'images' in configuration 'linux-x86-zero-release' (exit code 2)
Stopping javac server

=== Output from failing command(s) repeated here ===
* For target buildtools_create_symbols_javac__the.COMPILE_CREATE_SYMBOLS_batch:
Error: Unable to load main class com.sun.tools.javac.Main in module jdk.compiler
Caused by: java.lang.VerifyError

* All command lines available in /home/vladimirp/work/git/jdk/build/linux-x86-zero-release/make-support/failure-logs.
=== End of repeated output ===

No indication of failed target found.
HELP: Try searching the build log for '] Error'.
HELP: Run 'make doctor' to diagnose build problems.

make[1]: *** [/home/vladimirp/work/git/jdk/make/Init.gmk:151: main] Error 2
make: *** [/home/vladimirp/work/git/jdk/make/PreInit.gmk:160: images] Error 2

The build fails due to https://bugs.openjdk.org/browse/JDK-8390159.

After applying the patch for https://bugs.openjdk.org/browse/JDK-8390159

Creating CDS archive for jdk image for zero
Finished building target 'images' in configuration 'linux-x86-zero-release'

---

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---

Progress

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• Commit message must refer to an issue

Issue

• JDK-8390432: Zero i386 build broken after JDK-8389219 (Bug - P4)

Reviewers

• Aleksey Shipilev (@shipilev - Reviewer)

Reviewing

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$ git checkout pull/32405

Update a local copy of the PR:
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$ git pull https://git.openjdk.org/jdk.git pull/32405/head

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Checkout this PR locally:
$ git pr checkout 32405

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Download this PR as a diff file:
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Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back vpetko! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@vpa1977 This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8390432: Zero i386 build broken after JDK-8389219

Reviewed-by: shade

You can use pull request commands such as /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 18 new commits pushed to the master branch:

• 87e206b: 8388792: False positives in jdk_foreign test suite
• 8ac703a: 8386861: [Valhalla] emit_opSubstitutabilityCheck speedup
• c82f3b8: 8388292: Shenandoah: Micro-optimize CompressedOops uses
• ... and 15 more: https://git.openjdk.org/jdk/compare/efd8ae1047cb87a96a2e355c8954c557337a1b96...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@shipilev) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[openjdk]

@vpa1977 The following labels will be automatically applied to this pull request:

• hotspot-gc
• shenandoah

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing lists. If you would like to change these labels, use the /label pull request command.

[openjdk]

The total number of required reviews for this PR has been set to 2 based on the presence of this label: hotspot-gc. This can be overridden with the /reviewers command.

[mlbridge]

Webrevs

• 00: Full (e8c16607)

[shipilev]

Ah yes, of course.

[shipilev]

I would say this is trivial and can be in with a single review.

[vpa1977]

/integrate

[openjdk]

@vpa1977 This pull request has not yet been marked as ready for integration.

[shipilev]

/reviewers 1

[openjdk]

@shipilev
The total number of required reviews for this PR (including the jcheck configuration and the last /reviewers command) is now set to 1 (with at least 1 Reviewer).

[shipilev]

Say /integrate again, @vpa1977

[vpa1977]

/integrate

[openjdk]

@vpa1977
Your change (at version e8c1660) is now ready to be sponsored by a Committer.