I'm seeing these compiler warnings while trying to build Python 3.5 on Ubuntu 15.04:

In file included from Python/ceval.c:300:0:
Python/ceval_gil.h: In function ‘drop_gil’:
Python/ceval_gil.h:181:144: warning: initialization from incompatible pointer type
         _Py_atomic_store_relaxed(&gil_last_holder, tstate);
                                                                                                                                                ^

In file included from Python/ceval.c:300:0:
Python/ceval_gil.h: In function ‘take_gil’:
Python/ceval_gil.h:243:144: warning: initialization from incompatible pointer type
         _Py_atomic_store_relaxed(&gil_last_holder, tstate);
                                                                                                                                                ^

Python/pystate.c: In function ‘PyThreadState_Swap’:
Python/pystate.c:509:147: warning: initialization from incompatible pointer type
     _Py_atomic_store_relaxed(&_PyThreadState_Current, newts);
                                                                                                                                                ^

/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c: In function ‘classify_argument’:
/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c:224:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < words; i++)
                ^
/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c:245:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for (i = 0; i < num; i++)
                    ^
/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c:264:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for (i = 1; i < words; i++)
                    ^
/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c:270:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < words; i++)
                ^
/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c: In function ‘examine_argument’:
/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c:323:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (i = 0; i < n; ++i)
                 ^
/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c: In function ‘ffi_call’:
/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c:484:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (j = 0; j < n; j++, a += 8, size -= 8)
                  ^
/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c: In function ‘ffi_closure_unix64_inner’:
/home/mg/src/cpython/Modules/_ctypes/libffi/src/x86/ffi64.c:659:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (j = 0; j < n; j++, a += 8)
                  ^

I saw bug #1616 and thought you might want to know about these.

For ceval, it comes from pyatomic.h: see my atomic_pointer.patch attached to the issue #25077.

"For ceval, it comes from pyatomic.h: see my atomic_pointer.patch attached to the issue #25077."

Oops, it's the issue #22038.

libffi warnings have already been fixed in upstream libffi. See issue 23085 for updating our libffi copy.

Issues 22038 and 23085 seem to have fixed all these warnings between them.

nosy: + iritkatriel
messages: + msg384939

resolution: out of date
stage: resolved