RFR: 8017234: Hotspot should stop using mapfiles

[Magnus Ihse Bursie]

On Thu, 22 Feb 2024 09:55:21 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> We're currently using __attribute__ ((visibility ("X"))) elsewhere, so I think I should stick with that.
>> 
>> And, as I said in my long explanation, this is definitely a hack. The reason it is here is that I want to make sure the symbol table is 100% identical before and after this patch. 
>> 
>> Why this is needed, I don't know. I believe it is a bug in GCC, since we compile with -fvisibility=hidden. But I don't really know. Maybe there is something in the C++ standard that makes these functions behave differently. Perhaps they are even slightly incorrectly defined?
>
> Ah, I should have clarified that I did read the explaination, just that it slipped my mind at the time. I can't remember if C++14 or C++17 is the version for compilers ignoring unknown attributes though
> 
> Also, you can escape the underscores with \ to avoid GitHub formatting. GitHub can get annoying with its formatting sometimes
> 
> Is there a chance this can be fixed in a followup somehow? I could help with that, given I have access to WSL2 for Linux

You mean making a search/replace from `__attribute__ ((foo))` to `[[gnu::foo)]]` in the code base? It seems a bit like unnecessary churn to me. We have 100+ places in the code with `__attribute__`. If you really want to try to push that agenda, be my guest. But do it in a separate PR. ;-)

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PR Review Comment: https://git.openjdk.org/jdk/pull/17955#discussion_r1499001259