[trac710] Check if we need -Wno-unused-parameter for Python.h

configure.ac

@@ -184,6 +184,30 @@ CPPFLAGS="$CPPFLAGS ${PYTHON_INCLUDES}"
 AC_CHECK_HEADERS([Python.h],, AC_MSG_ERROR([Missing Python.h]))
 CPPFLAGS="$CPPFLAGS_SAVED"
 
+# Python 3.2 has an unused parameter in one of its headers. This
+# has been reported, but not fixed as of yet, so we check if we need
+# to set -Wno-unused-parameter.
+CPPFLAGS_SAVED="$CPPFLAGS"
+CPPFLAGS="$CPPFLAGS ${PYTHON_INCLUDES} -Wall -Wextra -Werror"
+AC_MSG_CHECKING([whether we need -Wno-unused-parameter for python])
+AC_TRY_COMPILE(
+    [#include <Python.h>],
+    [],
+    [AC_MSG_RESULT(no)],
+    [
+    CPPFLAGS="$CPPFLAGS -Wno-unused-parameter"
+    AC_TRY_COMPILE([#include <Python.h>],
+        [],
+        [AC_MSG_RESULT(yes)
+         PYTHON_INCLUDES="${PYTHON_INCLUDES} -Wno-unused-parameter"
+         AC_SUBST(PYTHON_INCLUDES)
+        ],
+        [AC_MSG_ERROR([Can't compile against Python.h])]
+    )
+    ]
+)
+CPPFLAGS="$CPPFLAGS_SAVED"
+
 # Check for python library.  Needed for Python-wrapper libraries.
 LDFLAGS_SAVED="$LDFLAGS"
 LDFLAGS="$LDFLAGS $PYTHON_LDFLAGS"