Consider a simple module, like:
module test {}
And compile it with JDK 22 and JDK 21 using:
javac --release 21
The results of the compilations will differ: when compiling with JDK 21, the
mandated java.base dependency will get a version, possibly like "21-internal".
When compiling with JDK 22, the version of the java.base dependency will be
empty.
This is a) because `module-info.class`es in `ct.sym` do not have any module
version set; b) for JDK N, `--release N` is not using `ct.sym`, but rather
`lib/modules`, which may contain a range of version specifiers.
This patch does two changes:
a) tweaks the `module-info.class`es in `ct.sym`, so that they contain a simple
version. For `--release N`, the version is `N`.
b) tweaks the whole build so that `ct.sym` is used always for `--release`, a
`lib/modules` is never used. I.e. the appropriate classfiles are copied into
`ct.sym`. This not only allows for a general approach to module versions, but
simplifies the `--release` handling in javac, and should enable future
improvements. This is, however, a relatively big change.
The use of `lib/modules` for `--release <current>` was made to improve build
performance, but the build has been updated since this has been introduced, so
the slowdown caused by rebuilding `ct.sym` should be much lower now.
With these changes, compiling with `--release N` should record the same
dependency versions in `module-info` on JDK N and JDK N + 1.
-------------
Commit messages:
- Test cleanup.
- Merge branch 'master' into JDK-8318913
- Fixing tests.
- Retain packages for extra classes.
- Handle permitted subtypes.
- Fix for writing empty parameter names.
- Fixing tests.
- Fixing tests.
- Cleanup
- Fixing dependencies
- ... and 7 more: https://git.openjdk.org/jdk/compare/667cca9d...522d58d6
Changes: https://git.openjdk.org/jdk/pull/16400/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16400&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8318913
Stats: 554 lines in 11 files changed: 429 ins; 58 del; 67 mod
Patch: https://git.openjdk.org/jdk/pull/16400.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/16400/head:pull/16400
PR: https://git.openjdk.org/jdk/pull/16400
