A fix for bug pr99832 was committed to gcc trunk: https://gcc.gnu.org/cgit/gcc/commit/?id=d045eb13b0b42870a1f081895df3901112a358f0
See the commit message regarding the effect of defining _TIME_BITS=64 on std::chrono::system_clock::to_time_t. This affects release architectures as well as hppa (armel and armhf). The debian patch is broken in that _GLIBCXX_TIME_BITS64_ABI_TAG is redefined to an empty string which does nothing other than generate a warning. The warning breaks hundreds of tests and makes it impossible to assess build quality. Hope this can be fixed. Dave -- John David Anglin jda.par...@gmail.com