RFR: 8351029: IncludeCustomExtension does not work on cygwin with source code below /home

Wed May 7 20:36:51 UTC 2025

If you check out your source code in Cygwin, somewhere under /home/... (as opposed to /cygpath/...), IncludeCustomExtension does not work.

The problem is that TOPDIR gets a different lexical value from the spec.gmk file when setup in Makefile, even if this was the same directory. Since THIS_INCLUDE is calculated as a relative path by string substitution of $(TOPDIR), the path failed to relativize correctly.

-------------

Commit messages:
 - 8351029: IncludeCustomExtension does not work on cygwin with source code below /home

Changes: https://git.openjdk.org/jdk/pull/25100/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25100&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351029
  Stats: 7 lines in 1 file changed: 4 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/25100.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25100/head:pull/25100

PR: https://git.openjdk.org/jdk/pull/25100