On 2018-04-12 19:42, Dan Smith wrote:
I'm suddenly getting hundreds of these warnings when I build in macOS:

warning: macro expansion producing 'defined' has undefined behavior 
/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.


Is this a known problem? Can anyone reproduce?

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