As this is blocking quite a lot of stuff (via e.g. petsc) and there is no progress either upstream or in Debian on this problem, and assuming it's not viable to remove this build-dep from all reverse deps, I propose using DEB_BUILD_MAINT_OPTIONS = qa=-bug-implicit-func and hoping that this doesn't hide any problems that weren't present before the t64 transition that affect code that people actually run (which may be an empty set, especially on armel and armhf, but we may never know).
-- WBR, wRAR
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