C++: Remove potential FPs in cpp/wrong-type-format-argument in BMN

Author: calumgrant

cpp/ql/src/Likely Bugs/Format/WrongTypeFormatArguments.ql

@@ -152,6 +152,12 @@ predicate trivialConversion(ExpectedType expected, Type actual) {
  */
 int sizeof_IntType() { exists(IntType it | result = it.getSize()) }
 
+predicate buildModeNoneIntLongConversion(IntType formatType, LongType argumentType) {
+  exists(formatType) and
+  exists(argumentType) and
+  exists(Compilation c | c.buildModeNone())
+}
+
 from FormattingFunctionCall ffc, int n, Expr arg, Type expected, Type actual
 where
   (
@@ -171,7 +177,8 @@ where
   not arg.isAffectedByMacro() and
   not arg.isFromUninstantiatedTemplate(_) and
   not actual.stripType() instanceof ErroneousType and
-  not arg.(Call).mayBeFromImplicitlyDeclaredFunction()
+  not arg.(Call).mayBeFromImplicitlyDeclaredFunction() and
+  not buildModeNoneIntLongConversion(expected, actual.getUnspecifiedType())
 select arg,
   "This format specifier for type '" + expected.getName() + "' does not match the argument type '" +
     actual.getUnspecifiedType().getName() + "'."

cpp/ql/test/query-tests/Likely Bugs/Format/WrongTypeFormatArguments/Buildless/WrongTypeFormatArguments.expected

@@ -1,8 +1,4 @@
 | tests.c:7:18:7:18 | 1 | This format specifier for type 'char *' does not match the argument type 'int'. |
-| tests.c:12:27:12:29 | 42 | This format specifier for type 'int' does not match the argument type 'long'. |
-| tests.c:12:32:12:35 | 42 | This format specifier for type 'int' does not match the argument type 'unsigned long'. |
-| tests.c:12:38:12:40 | 42 | This format specifier for type 'unsigned int' does not match the argument type 'long'. |
-| tests.c:12:43:12:46 | 42 | This format specifier for type 'unsigned int' does not match the argument type 'unsigned long'. |
 | tests.c:13:27:13:30 | 42 | This format specifier for type 'int' does not match the argument type 'long long'. |
 | tests.c:13:33:13:37 | 42 | This format specifier for type 'int' does not match the argument type 'unsigned long long'. |
 | tests.c:13:40:13:43 | 42 | This format specifier for type 'unsigned int' does not match the argument type 'long long'. |

cpp/ql/test/query-tests/Likely Bugs/Format/WrongTypeFormatArguments/Buildless/tests.c

@@ -9,7 +9,7 @@ void f(UNKNOWN_CHAR * str) {
     sprintf(0, "%s", ""); // GOOD
     fprintf(0, "%s", ""); // GOOD
     printf("%s", str); // GOOD: erroneous type is ignored
-    printf("%d %d %u %u", 42l, 42ul, 42l, 42ul); // BAD (FP)
+    printf("%d %d %u %u", 42l, 42ul, 42l, 42ul); // GOOD: build mode none
     printf("%d %d %u %u", 42ll, 42ull, 42ll, 42ull); // BAD
     printf("%ld %ld %lu %lu", 42, 42u, 42, 42u); // BAD
 }