8378180: Compiling OpenJDK with C23 C-Compiler gives warning: initialization discards ‘const’ qualifier from pointer target type

[fthevenet]

This is an unclean backport of of commit 16971af1 from the openjdk/jdk17u-dev repository (itslef a backport of 76a44b3e from openjdk/jdk).

The aim for this backport is to address compiler warnings that arise when attempting to build with with more recent version of gcc (16.1+).

The patch does not appy cleanly; the following modifications were necessary:

• Ignore the changes to src/jdk.jpackage/linux/native/applauncher/LinuxPackage.c as the file doesn't exists in jdk11
• The changes in src/java.base/unix/native/libnet/NetworkInterface.c are not applicaple to jdk11 (*colonP is assigned a value at line 251, cannot be declared const)
• A change not included in the original patch is required to prevent a discarded-qualifiers warning in src/jdk.jdwp.agent/share/native/libdt_socket/socketTransport.c

I have verified that with this patch, jdk11u-dev compiles without warning on Fedora 44 with gcc 16.1.1.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8378180 needs maintainer approval

Issue

• JDK-8378180: Compiling OpenJDK with C23 C-Compiler gives warning: initialization discards ‘const’ qualifier from pointer target type (Enhancement - P3)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk11u-dev.git pull/3231/head:pull/3231
$ git checkout pull/3231

Update a local copy of the PR:
$ git checkout pull/3231
$ git pull https://git.openjdk.org/jdk11u-dev.git pull/3231/head

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Checkout this PR locally:
$ git pr checkout 3231

View PR using the GUI difftool:
$ git pr show -t 3231

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Download this PR as a diff file:
https://git.openjdk.org/jdk11u-dev/pull/3231.diff

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

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• 00: Full (5c39c03e)