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We currently apply a patch https://github.com/cms-sw/cmsdist/blob/c1e2d7ab02f957e01e7325ecf1259eb8f06b0e8d/dd4hep-add-ppc64-macro-check.patch so that we get into that condition and include that header when building on ppc64. So if it's reasonable I propose to get this in
BEGINRELEASENOTES
cxxabi.h
ENDRELEASENOTES