paurkedal/bdwgc — comment on commit 00fb4f757a8fb395ca43f13ea0927e3bb58c0bef
File:  line 0
By ivmai:

PRIdPTR seems to me practically useless for printf (heap size is printed with 'M' suffix to be more human-readable and that value fits into 32-bit).
WARN_PRIdPTR exists just because WARN proc accepts only values of word type.