RFR: 8267706: bin/idea.sh tries to use cygpath on WSL [v2]

[Nikita Gubarkov]

On Wed, 2 Jun 2021 13:24:00 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> Nikita Gubarkov has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8267706: Break long line in make/ide/idea/jdk/idea.gmk
>
> We do not require brew to install packages on mac, the build doc references brew as an easy way to get autoconf. I personally have always built autoconf from source instead (as it's a very simple build that takes a few seconds at most). I agree that adding a new dependency on the build is troublesome. We generally try really hard to avoid depending on tools that aren't default available on all the main build environments. I didn't check this review very closely for such things. I also did say that I wanted people who actually use this script to weigh in, which I didn't see happen before it was integrated.
> 
> Looking at the patch again, the first realpath use can easily be worked around by generating the relative path to SPEC_DIR from idea.gmk. In make we have a macro to generate relative paths, see RelativePath in common/Utils.gmk. The second realpath is operating on moduleSrcDirs, also generated in idea.gmk. The same thing can be applied here, the RelativePath macro together with a foreach can be used to export the src dirs as relative paths.
> 
> In general, I think we would have been much better off if this script was just written in make from the start, as we have more platform independent tools available there already. Rewriting it isn't trivial though, and requires quite a bit of knowledge both of GNU make as well as our macros, so I'm not asking for this to happen. I do think we should eliminate the use of realpath though.

@erikj79 thank you for the hint about `RelativePath` macro, I will rewrite this logic and get rid of `realpath`. Can I reference the same issue in new PR, or do I need a new one?

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PR: https://git.openjdk.java.net/jdk/pull/4190