-Wexpansion-to-defined warnings

Henry Jen henry.jen at oracle.com
Thu Apr 12 18:24:18 UTC 2018

Yes, it’s a known issue after upgrade Xcode,



> On Apr 12, 2018, at 11:19 AM, Magnus Ihse Bursie <magnus.ihse.bursie at oracle.com> wrote:
> On 2018-04-12 19:42, Dan Smith wrote:
>> I'm suddenly getting hundreds of these warnings when I build in macOS:
>> /Users/dan/Dev/jdk/jdk/src/hotspot/share/gc/g1/heapRegionSet.hpp:126:5: warning: macro expansion producing 'defined' has undefined behavior [-Wexpansion-to-defined]
>>     ^
>> /Users/dan/Dev/jdk/jdk/src/hotspot/share/gc/g1/heapRegionSet.hpp:53:38: note: expanded from macro 'HEAP_REGION_SET_FORCE_VERIFY'
>>                                      ^
> I think I saw a discussion about fixing this since the new Visual Studio compiler also complained about it, or so. It might even be fixed in jdk/hs.
>> Not clear what triggered them, but my guess is an Xcode update.
> If you updated Xcode, and are using that instead of jib for building, then yes, that's likely.
> /Magnus
>> Is this a known problem? Can anyone reproduce?

More information about the build-dev mailing list