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f0ef883824
Current versions of squid have a run test for gnu atomics w/no cross-compile fallback causing builds to fail. Upstream has rewritten this completely, so until we update to a newer version, force the cache variable when cross-compiling. Forcing it to no might not be optimal in all cases, but it's better than nothing. We have been turning on large-file-system support for a while now, but the configure test for that probes the build system for flags to compile with (via `getconf ...`). These flags don't work for the cross-compile target, and in reality are rarely necessary. By selecting the default, we always go the standard POSIX route with the -D_FILE_OFFSET_BITS=64 flag. If a target doesn't respect that flag, then it might fail to build, but we can wait for anyone to complain.