RFR: 8348391: Keep case if possible for TOPDIR

[Erik Joelsson]

On Thu, 23 Jan 2025 10:14:24 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> To figure out the root of the JDK build, we set the TOPDIR variable in configure. Furthermore, we clean it up using UTIL_FIXUP_PATH as we do with all paths. On Windows, this can result in the path becoming all lowercase. Since Windows paths are case insensitive, this is normally not a problem. However, we try to strip the TOPDIR from paths in several locations like this:
> 
> 
> $$(subst $$(TOPDIR)/, , $$($1_TEST_RESULTS_DIR))
> 
> 
> and that will only work if the case actually matches.

Will this also fix the issue with case insensitive paths on Mac, where if the $PWD value has a different case than the actual path to the workspace root, we fail to recognize that it's the workspace root?

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Marked as reviewed by erikj (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23259#pullrequestreview-2569925693