bt2: ignore -Wredundant-decls warning

The ppc builder on the CI, which uses Python 3.11 + gcc 12.2.0, shows
this warning:

    In file included from /usr/include/python3.11/Python.h:91,
                     from bt2/native_bt.c:168:
    /usr/include/python3.11/modsupport.h:37:24: error: redundant redeclaration of ‘_Py_BuildValue_SizeT’ [-Werror=redundant-decls]
       37 | PyAPI_FUNC(PyObject *) _Py_BuildValue_SizeT(const char *, ...);
          |                        ^~~~~~~~~~~~~~~~~~~~
    /usr/include/python3.11/modsupport.h:20:41: note: previous declaration of ‘_Py_BuildValue_SizeT’ with type ‘PyObject *(const char *, ...)’ {aka ‘struct _object *(const char *, ...)’}
       20 | #define Py_BuildValue                   _Py_BuildValue_SizeT
          |                                         ^~~~~~~~~~~~~~~~~~~~
    /usr/include/python3.11/modsupport.h:36:24: note: in expansion of macro ‘Py_BuildValue’
       36 | PyAPI_FUNC(PyObject *) Py_BuildValue(const char *, ...);
          |                        ^~~~~~~~~~~~~

I tried fixing it by placing some push/ignored/pop diagnostic pragmas in
the SWIG sections %begin and %runtime, which would be around the
Python.h including in the generated native_bt.c file, but it doesn't
silence the warning for some reason.

Ignore the warning for the whole native_bt.c compilation instead.

Change-Id: Idae04fb30af8108ad14647d9b8f85b2d01a568be
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/src/bindings/python/bt2/Makefile.am b/src/bindings/python/bt2/Makefile.am
index c8e3eb44ae99e391fba19fccd46b1d7048a00a9a..aec0770bdcb3db5d819a4d083c7312f740311b5a 100644 (file)
--- a/src/bindings/python/bt2/Makefile.am
+++ b/src/bindings/python/bt2/Makefile.am
@@ -119,6 +119,9 @@ WARN_CFLAGS += -Wno-null-dereference
 # code.
 WARN_CFLAGS += -Wno-deprecated-declarations
 
+# Python 3.11 + gcc 12.2.0 gave warnings of this kind in Python.h.
+WARN_CFLAGS += -Wno-redundant-decls
+
 BUILD_FLAGS=CC="$(CC)" \
                CFLAGS="$(GLIB_CFLAGS) $(AM_CFLAGS) $(CFLAGS) $(WARN_CFLAGS)" \
                CPPFLAGS="$(AM_CPPFLAGS) $(CPPFLAGS) -I$(srcdir)/bt2" \