id summary reporter owner description type status milestone component version severity resolution keywords cc 13454 universal 32/64 bits build broken on macOS (worked until 1.65.1) Frédéric Devernay "Since boost 1.66.0, when configured with `architecture=x86 address-model=32_64`, the build system forgets to add `-arch i386 -arch x86_54` to the compilation flags (although they are still present in the link flags). The resulting libraries thus contain only the build arch. Boost 1.65.1 correctly builds universal libraries. to reproduce: {{{ ./bootstrap.sh --without-libraries=mpi --without-libraries=context --without-libraries=coroutine ./b2 -d2 --debug-configuration architecture=x86 address-model=32_64 }}} see also: https://trac.macports.org/ticket/55857" Bugs new To Be Determined Building Boost Boost 1.66.0 Problem boost@…