Hi, mini-gmp currently always passes old_size == 0 to the custom reallocate function, causing custom allocators for GMP that use old_size to determine the amount of data to copy data to newly allocated space to malfunction with mini-gmp.
According to GMP documentation chapter 13 for reallocate_function: "The block may be moved if necessary or if desired, and in that case the smaller of old_size and new_size bytes must be copied to the new location." As in general mini-gmp cannot assume that the reallocate function will not move the block, it should always pass non-zero old_size to the reallocate function if it wants the old data to be preserved. I have modified mini-gmp and its testsuite to conform to this definition from GMP. Patch against the latest hg tip (c44538397385) is attached. Thanks! Sincerely, Minux
mini-gmp.patch
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