RFR: JDK-8317799 : AIX PPC64: FFI symbol lookup doesn't find symbols

[Jorn Vernee]

On Mon, 30 Oct 2023 10:54:48 GMT, suchismith1993 <duke at openjdk.org> wrote:

> 1. Adding required compiler flags.
> 2. Adding required symbols.
> 
> JBS-ISSUE : [JDK-8317799](https://bugs.openjdk.org/browse/JDK-8317799)

For some context: `java.lang.foreign.Linker.nativeLinker().defaultLookup()` returns a `SymbolLookup` that can be used to find symbols from the standard library.

We use a shim library that re-exports symbols from the standard library in order to make them accessible through `dlsym`, since on e.g. Linux the standard library .so files might actually be linker scripts which we don't want to mess with. On Windows we use ucrtbase.dll + an auxiliary library that contains the expansions of several 'inline' functions such as `printf`. I'm not surprised to see that another platform like AIX requires more to make this work as well.

That said, I think we should limit the exported symbols to only those found in the standard C library header files: https://en.cppreference.com/w/c/header

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PR Comment: https://git.openjdk.org/jdk/pull/16414#issuecomment-1803944836