Missing cstddef header in cilksan/disjointset.h

[budvinchathura]

cilksan/disjointset.h is missing header #include <cstddef>.

This causes the compilation to fail at

productivity-tools/cilksan/disjointset.h

Line 503 in 458233b

DJSetIdx -= offsetof(DSSlab_t, DJSets);

where offsetof requires <cstddef>

Tested on gcc/g++ 13.2.0

[neboat]

Thanks for raising this issue.

I'm not sure why I'm not seeing any problems when I compile OpenCilk, even with gcc/g++ 13.2. But the issue makes sense and is straightforward to fix.

[budvinchathura]

Yes agree, this only happened when building on a slightly older stack on a cluster, CentOS Linux release 7.9.2009 (Core) , ldd (GNU libc) 2.17.