RFR: Add support for AIX in build process [v5]

[Jorn Vernee]

On Mon, 8 Dec 2025 11:46:39 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> src/main/java/org/openjdk/jextract/clang/libclang/Index_h.java line 95:
>> 
>>> 93:                 libName = f.getAbsolutePath();
>>> 94:             }
>>> 95:             SYMBOL_LOOKUP = SymbolLookup.libraryLookup(libName + "(libclang.so.14)", Arena.global());
>> 
>> If we don't enter the `if` statement, the library name will end up as `null(libclang.so.14)`. `libraryLookup` throws an IAE when the library can not be loaded, so I think we can just construct the name and try to load the library.
>> Suggestion:
>> 
>>             String javaHome = System.getProperty("java.home");
>>             String libName = javaHome + "/lib/libclang.a(libclang.so.14)";
>>             SYMBOL_LOOKUP = SymbolLookup.libraryLookup(libName, LIBRARY_ARENA);
>
> Also, this should use `LIBRARY_ARENA`, so the library can be unloaded.

As for hard-coding the library version. We could potentially record the libclang version in a file we store under `conf` in the runtime image, similar to what we do for the bundled header files. The version could then be loaded from that file here.

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PR Review Comment: https://git.openjdk.org/jextract/pull/297#discussion_r2598349179