RFR: 8338851: Hoist os::Posix::realpath() to os::realpath() and implement on Windows [v5]

[Julian Waters]

On Thu, 12 Sep 2024 13:56:42 GMT, Simon Tooke <stooke at openjdk.org> wrote:

>> This PR changes the status of realpath() from a Posix-specific API to a globally available API, i.e. adding it to the "Hotspot Porting API".  Code would refer to os::realpath() instead of os::Posix::realpath().
>> 
>> This requires the addition of a stub routine in os_posix.cpp and a Windows implementation of realpath(), using Windows _fullpath().
>> 
>> This PR depends on #20597 in that it removes the need for one #ifdef in that PR.  Because of that, this PR will be modified when and if #20597 is integrated (or vice-versa)
>> 
>> Please note that guidelines for doing this appear in src/hotspot/share/runtime/os.hpp
>
> Simon Tooke has updated the pull request incrementally with three additional commits since the last revision:
> 
>  - remove empty line
>  - fix indentation
>  - fix missing return statement

Good work!

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Marked as reviewed by jwaters (Committer).

PR Review: https://git.openjdk.org/jdk/pull/20683#pullrequestreview-2306707222