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This is the reason why files >= 2G could not be added to cpio, even on
64-bit architectures. Fwrite was called with a buffer >= 2G, but the
return value was truncated to int (this narrowing conversion is probably
undefined behavior already; what happens next, though, is that after
casting to size_t it assumes a very big numeric value of >= 2^64-2^32).
So rpmbuild was failing with an unrelated errno, "cpio: write failed -
Bad file descriptor".
There are other reasons why this still won't work on 32-bit architectures.
For one, rpmbuild mmaps a file before feeding it to cpio, and 32-bit
architectures have a very limited ability, if any, to mmap 2G+ files.
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