JDK-8257547: Handle multiple prereqs on the same line in deps files

[erikj79]

After fixing JDK-8256810 and starting to look into backporting it, I discovered more potential failing cases. Certain versions of GCC may sometimes output multiple prerequisite files on the same line. I think the easiest way to handle this new issue is to split such lines.

When splitting lines, we need to make sure to not just split on any space. Some compilers output the : of the rule with a leading space, and already split lines will have a space before the backslash.

---

Progress

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Issue

• JDK-8257547: Handle multiple prereqs on the same line in deps files

Reviewers

• Magnus Ihse Bursie (@magicus - Reviewer)
• Tim Bell (@tbell29552 - Reviewer) ⚠️ Review applies to 0c85406

Download

$ git fetch https://git.openjdk.java.net/jdk pull/1548/head:pull/1548
$ git checkout pull/1548

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[mlbridge]

Webrevs

• 03: Full - Incremental (d0039c3)
• 02: Full - Incremental (0c85406)
• 01: Full - Incremental (9f8a7ed)
• 00: Full (3164af5)

[magicus]

As before, regex is write-only code. :-& But I think this does what you claim it to do. :)

I'm not sure how hard it would be to add unit testing of this function (probably quite tricky), but it's starting to get close to the point were it's worth it.

[openjdk]

@erikj79 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:

8257547: Handle multiple prereqs on the same line in deps files

Reviewed-by: ihse, tbell

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

At the time when this comment was updated there had been 28 new commits pushed to the master branch:

• 3da30e9: 8257241: CDS should not handle disableEagerInitialization for archived lambda proxy classes
• 7104400: 8257164: Share LambdaForms for VH linkers/invokers
• 3e89981: 8257623: vmTestbase/nsk/jvmti/ResourceExhausted/resexhausted001/TestDescription.java shouldn't use timeout
• 93b6ab5: 8256818: SSLSocket that is never bound or connected leaks socket resources
• 692b273: 8257189: Handle concurrent updates of MH.form better
• 6704266: 8257565: epsilonBarrierSet.hpp should not include barrierSetAssembler
• 0b8c780: 8256256: UL should not use heap allocation for output string
• 2508bc7: 8257140: Crash in JvmtiTagMap::flush_object_free_events()
• cfb50a9: 8253916: ResourceExhausted/resexhausted001 crashes on Linux-x64
• 287b829: 8254877: GCLogPrecious::_lock rank constrains what locks you are allowed to have when crashing
• ... and 18 more: https://git.openjdk.java.net/jdk/compare/015e6e58c51e489b3ba0221abe2de966bf05e0de...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.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[tbell29552]

As @magicus wrote - this is subtle but looks OKAY.

[erikj79]

I added a test as suggested. This uncovered some portability issues as the test failed on Macosx. I have modified the fix-deps-file macro even more to make it portable for all the versions of sed we are currently using.

[tbell29552]

Does this need to be:
$(DIFF) $(DEPS_FILE).expected $(DEPS_FILE).tmp

[erikj79]

No, the fix-deps-file macro takes file.tmp as input and outputs into file, so $(DEPS_FILE) is the output file from the macro in this case.

[tbell29552]

OK

[erikj79]

/integrate

[openjdk]

@erikj79 Since your change was applied there have been 53 commits pushed to the master branch:

• c5b32b3: 8256808: com/sun/jdi/CatchAllTest.java failed with "NullPointerException: Cannot invoke "lib.jdb.Jdb.log(String)" because "this.jdb" is null"
• 8526947: 6508941: java.awt.Desktop.open causes VM to crash with video files sporadically
• 7c7facc: 8257701: Shenandoah: objArrayKlass metadata is not marked with chunked arrays
• 2b73f99: 8228615: Optional.empty doc should suggest using isEmpty
• 805d058: 8254699: Suboptimal PreTouchParallelChunkSize defaults and limits
• e29ee5b: 8257641: Shenandoah: Query is_at_shenandoah_safepoint() from control thread should return false
• 55f5542: 8026976: ECParameters, Point does not match field size
• d3f3c32: 8255742: PrintInlining as compiler directive doesn't print virtual calls
• 6c9482e: 8257561: Some code is not vectorized after 8251925 and 8250607
• 70517c8: 8257642: CipherByteBufferOverwriteTest copyright issue
• ... and 43 more: https://git.openjdk.java.net/jdk/compare/015e6e58c51e489b3ba0221abe2de966bf05e0de...master

Your commit was automatically rebased without conflicts.

Pushed as commit 36209b7.

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