[foreign-memaccess+abi] RFR: Remove printf and vprintf tests [v2]

[Maurizio Cimadamore]

On Fri, 14 May 2021 12:18:32 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> This patch removes the printf and vprintf tests, since the symbols are not available on Windows in the UCRT.
>> 
>> gmtime is similarly an inline function that maps to something else, but in that case there is a drop-in replacement symbol name _gmtime64 we can call instead.
>> 
>> This fixes the missing symbol errors in StdLibTest.
>
> Jorn Vernee has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Rather than removing or disabling tests on Windows, fall back to a helper library that can return the right function addresses to us.
>  - Only disable tests on Windows instead.

Looks good. One possible simplification would be, since you already have a supporting library for windows, to just define printf/vprintf/gmtime there, and then define a lookup that first looks in systemLookup and then falls back in the loader lookup. In fact, you could define the test lookup always in this way, and just do a System.loadLibrary in the windows case.

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Marked as reviewed by mcimadamore (Committer).

PR: https://git.openjdk.java.net/panama-foreign/pull/536