<AWT Dev> RFR: 8253375: OSX build fails with Xcode 12.0 (12A7209) [v2]

[Kim Barrett]

> On Sep 29, 2020, at 4:05 PM, Lutz Schmidt <lucy at openjdk.java.net> wrote:
> 
> On Tue, 29 Sep 2020 19:33:48 GMT, Paul Hohensee <phh at openjdk.org> wrote:
> 
>>> Please review this small patch to enable the OSX build using Xcode 12.0.
>>> 
>>> Thanks,
>>> Paul
>> 
>> Paul Hohensee has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev
>> excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since
>> the last revision:
>> - 8253375: Reverted CSystemColors.m patch, replaced sharedRuntime.cpp patch
>> - Merge branch 'master' into JDK-8253375
>> - JDK-8253375
> 
> The proposed (updated) change does _NOT_ compile on my machine (MacOS 10.15.6, Xcode 12.0):
> 
> sharedRuntime.cpp:2860:46: error: cannot cast from type 'struct (anonymous struct at sharedRuntime.cpp:2859:7)' to
> pointer type 'relocInfo *’

Did you use the change from the PR, or apply it manually.  That looks like the error one would get if
only the type of locs_buf were changed, without changing to take the address in the reference.  That
is, without changing `(relocInfo*)locs_buf` to `(relocInfo*)&locs_buf`.  That second change is in the PR.

> You will have to use a union (option (2) as proposed by Kim Barrett far above. I proved that variant compiles on my
> machine.
> 
> -------------
> 
> Changes requested by lucy (Reviewer).
> 
> PR: https://git.openjdk.java.net/jdk/pull/348