Christian Franke wrote:
This segfaults if gcc -fno-builtin option is used:
  ffs(0x80000000)

These work:
  ffs(0xc0000000)
  ffs(0x40000000)

Likely a subtle problem in table based ffs() implementation in winsup/cygwin/syscalls.cc if only upper bit is set. The newlib version of ffs() works.


https://cygwin.com/ml/cygwin-patches/2014-q3/msg00014.html


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