GCC 4.9 build error child.c:274:14: error: variable 'lastop' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered]

[Vinson Lee]

This build error occurs with GCC 4.9.

$ gcc --version
gcc (GCC) 4.9.0 20140411 (Red Hat 4.9.0-0.10)
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ make
[...]
  CC    child.o
child.c: In function 'child_process':
child.c:274:14: error: variable 'lastop' might be clobbered by
'longjmp' or 'vfork' [-Werror=clobbered]
  const char *lastop = NULL;
              ^
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