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(By its name DT_SYMTAB_SHNDX might look to not match the scheme intended to be used above the boundary, looking more like a d_val kind of tag than a d_ptr one, but from its description it really is an address. Plus even that would only justify bumping to 35.) I think that part of the change wants reverting, unless an up-to-date spec [1] has moved the marker. Jan [1] In search for a new place where the gABI doc would live I found https://groups.google.com/g/generic-abi/c/9OO5vhxb00Y, but that doesn't indicate what github project, if any, would have been created. Hence for now I can only refer to the about 10 years old version on sco.com.