RFR: 8255128: linux x86 build failure with libJNIPoint.c

[Aleksey Shipilev]

On Mon, 2 Nov 2020 18:36:32 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Add 32-bit-safe version of jlong <-> casts to libJNIPoint.c
> 
> This removes the reported warning.
> 
> Note that the _LP64 macro was not being propagated to the benchmark native libraries on Windows. The comment says that this is due to pack200, but since this has been removed [1], it seemed safe to propagate the macro now (backed up by testing).
> 
> CC'ing hotspot-runtime since I know some people there were looking forward to having this fixed.
> 
> Testing: tier1-3
> 
> [1] https://bugs.openjdk.java.net/browse/JDK-8232022

I knew this looks familiar. Look at [existing macros in jlong_md.h](https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjava/jlong_md.h#L67-L81) and use/match them? There is a little difference in casting through `jint` in your code, while `jlong_md.h` does it via `int`.

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PR: https://git.openjdk.java.net/jdk/pull/1017