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USE_BUILTIN_FFS is defined to 1 within __GNUC__, and the __builtin_ffs
function is available since GCC 3.x at least, while the ffs function
only exists on some OSes.
This fixes compilation for non-x86 mingw platforms. For x86,
USE_BUILTIN_FFS is explicitly disabled for windows targets - but
if USE_BUILTIN_FFS is enabled based on __GNUC__, it should also use
the builtin which actually is available correspondingly, not dependent
on the target OS.
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This was committed to CPython's libffi copy in
https://bugs.python.org/issue10309
mremap() documentation says _GNU_SOURCE needs to
be defined in order to use mremap(): see the
synopsis section at http://linux.die.net/man/2/mremap
Original commit: https://hg.python.org/cpython/rev/9986fff720a2
Original patch was written by Hallvard B Furuseth.
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When compiling with --std==c99, GCC and clang don't define i386 but __i386__
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