PEP 238 documented -Qwarn as warning only for classic int or long

division, and this makes sense.  Add -Qwarnall to warn for all
classic divisions, as required by the fixdiv.py tool.

Modules/main.c

@@ -58,7 +58,7 @@ Options and arguments (and corresponding environment variables):\n\
 static char *usage_2 = "\
 -O     : optimize generated bytecode (a tad; also PYTHONOPTIMIZE=x)\n\
 -OO    : remove doc-strings in addition to the -O optimizations\n\
--Q arg : division options: -Qold (default), -Qwarn, -Qnew\n\
+-Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew\n\
 -S     : don't imply 'import site' on initialization\n\
 -t     : issue warnings about inconsistent tab usage (-tt: issue errors)\n\
 -u     : unbuffered binary stdout and stderr (also PYTHONUNBUFFERED=x)\n\
@@ -161,7 +161,11 @@ Py_Main(int argc, char **argv)
 				break;
 			}
 			if (strcmp(_PyOS_optarg, "warn") == 0) {
-				Py_DivisionWarningFlag++;
+				Py_DivisionWarningFlag = 1;
+				break;
+			}
+			if (strcmp(_PyOS_optarg, "warnall") == 0) {
+				Py_DivisionWarningFlag = 2;
 				break;
 			}
 			if (strcmp(_PyOS_optarg, "new") == 0) {
@@ -170,8 +174,8 @@ Py_Main(int argc, char **argv)
 				break;
 			}
 			fprintf(stderr,
-				"-Q option should be "
-				"`-Qold', `-Qwarn' or `-Qnew' only\n");
+				"-Q option should be `-Qold', "
+				"`-Qwarn', `-Qwarnall', or `-Qnew' only\n");
 			usage(2, argv[0]);
 			/* NOTREACHED */
 

Objects/complexobject.c

@@ -377,7 +377,7 @@ complex_classic_div(PyComplexObject *v, PyComplexObject *w)
 {
 	Py_complex quot;
 
-	if (Py_DivisionWarningFlag &&
+	if (Py_DivisionWarningFlag >= 2 &&
 	    PyErr_Warn(PyExc_DeprecationWarning,
 		       "classic complex division") < 0)
 		return NULL;

Objects/floatobject.c

@@ -419,7 +419,7 @@ float_classic_div(PyObject *v, PyObject *w)
 	double a,b;
 	CONVERT_TO_DOUBLE(v, a);
 	CONVERT_TO_DOUBLE(w, b);
-	if (Py_DivisionWarningFlag &&
+	if (Py_DivisionWarningFlag >= 2 &&
 	    PyErr_Warn(PyExc_DeprecationWarning, "classic float division") < 0)
 		return NULL;
 	if (b == 0.0) {

Tools/scripts/fixdiv.py

@@ -2,7 +2,7 @@
 
 """fixdiv - tool to fix division operators.
 
-To use this tool, first run `python -Qwarn yourscript.py 2>warnings'.
+To use this tool, first run `python -Qwarnall yourscript.py 2>warnings'.
 This runs the script `yourscript.py' while writing warning messages
 about all uses of the classic division operator to the file
 `warnings'.  The warnings look like this: