Issue #7485 has been updated by drbrain (Eric Hodel). Subject changed from ruby cannot build on mingw32 due to missing __sync_val_compare_and_swap to ruby cannot build on mingw32 or FreeBSD 8 due to missing __sync_val_compare_and_swap ---------------------------------------- Bug #7485: ruby cannot build on mingw32 or FreeBSD 8 due to missing __sync_val_compare_and_swap https://bugs.ruby-lang.org/issues/7485#change-34644 Author: drbrain (Eric Hodel) Status: Open Priority: Normal Assignee: nobu (Nobuyoshi Nakada) Category: build Target version: 2.0.0 ruby -v: trunk mingw32 GCC has the other atomic builtins but not this one. The attached patch checks for the GCC builtins used in ruby_atomic.h but not checked for by configure. -- http://bugs.ruby-lang.org/