> 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.
Jan Lahoda has updated the pull request incrementally with one additional commit since the last revision: Reflecting review comment - removing unnecessary lines. ------------- Changes: - all: https://git.openjdk.org/jdk/pull/16400/files - new: https://git.openjdk.org/jdk/pull/16400/files/ac8fb43d..70ab16d0 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=16400&range=03 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16400&range=02-03 Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 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