[libc-commits] [libc] [libc][mmap] force offset to long for mmap2 (PR #96522)

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enh-google wrote:

> I don't think we quite need to provide mmap2 or mmap64 as symbols

we only have mmap64() for historical reasons (we had to retrofit `_FILE_OFFSET_BITS=64` pretty late), and i don't think anyone exposes mmap2().

(fwiw, musl _removed_ a their `_LARGEFILE64_SOURCE` junk recently. it didn't cause much trouble that i know of, and means that folks likely to have trouble have already had it :-) )

> and I don't think we should attempt to support kernels that lack mmap2

yeah, the toybox guy has a "seven year rule" -- https://landley.net/toybox/faq.html#support_horizon -- that i think is quite reasonable, but Linux 2.4 is _way_ beyond that :-)

https://github.com/llvm/llvm-project/pull/96522