RFR: 8287917: System.loadLibrary does not work on Big Sur if JDK is built with macOS SDK 10.15 and earlier

[Mandy Chung]

On Wed, 8 Jun 2022 04:59:07 GMT, Yoshiki Sato <ysatowse at openjdk.org> wrote:

> Please review this PR.
> SDK 10.15 and earlier reports os.version as 10.16 on Big Sur.  This fix will check if dynamic linker support, which is supported from Big Sur, is available or not on the OS even if os.version is reported as 10.16 instead of 11.  The os.version 10.16 doesn't include the update version like y of 10.x.y.  Hence the change only see if it is 10.16 or not.

Looks good.  Thanks for fixing this.

As a background, Big Sur reports 10.16 as backward compatibility when built with macOS SDK 10.15 and earlier.   Hence this needs to check for os version 10.16 that supports dynamic linker cache.

test/jdk/java/lang/RuntimeTests/loadLibrary/exeLibraryCache/LibraryFromCache.java line 45:

> 43: public class LibraryFromCache {
> 44:     public static void main(String[] args) throws IOException {
> 45:         System.out.println("os.version = " + System.getProperty("os.version"));

The copyright end year needs to be updated.

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Marked as reviewed by mchung (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9077