RFR: 8307058: Implementation of Generational ZGC [v3]

[Stefan Karlsson]

On Wed, 3 May 2023 21:32:54 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> I'm getting build warnings on all linux platforms with gcc-11.3.0:
> 
> ```
> src/hotspot/share/gc/z/zDriver.cpp:84:13: error: In the GNU C Library, "minor" is defined
>  by <sys/sysmacros.h>. For historical compatibility, it is
>  currently defined by <sys/types.h> as well, but we plan to
>  remove this soon. To use "minor", include <sys/sysmacros.h>
>  directly. If you did not intend to use a system-defined macro
>  "minor", you should undefine it after including <sys/types.h>. [-Werror]
>    84 | ZDriverMinor* ZDriver::minor() {
> ```

That's unfortunate as minor and major are quite central to Generational ZGC and having to rename those functions will make the code look worse. I wonder if we should undef minor and major where needed.

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PR Comment: https://git.openjdk.org/jdk/pull/13771#issuecomment-1533806231