Suppress ‘PyStr_Concat’ defined but not used [-Wunused-function] warning

[jonathanunderwood]

On Python 2.7, when using py3c, I see a lot of noise from the compiler like this:

In file included from py3c/py3c.h:31:0,
                   from lz4/_version.c:38:
  py3c/py3c/compat.h:76:18: warning: ‘PyStr_Concat’ defined but not used [-Wunused-function]
   static PyObject *PyStr_Concat(PyObject *left, PyObject *right) {

with the default compiler flags on Fedora, which include -Wunused-function. This is, of course, a harmless warning, and entirely expected from the definition in compat.h of PyStr_Concat. Perhaps that function should be declared __attribute__((unused)) to suppress that warning for that definition?

[encukou]

Indeed, __attribute__((unused)) (with GCC guards) would be helpful.

[jonathanunderwood]

PR #19 does exactly that.

[encukou]

Closed in #19. Thank you for the fix!