x86_64-w64-mingw32-gcc throws following -Wsign-compare warning when
compiling 64-bit NT kernel drivers which include ddk/ntddk.h file:
ddk/wdm.h: In function ‘RtlExtendedMagicDivide’:
ddk/wdm.h:9531:32: warning: operand of ?: changes signedness from ‘long long
int’ to ‘ULONG64’ {aka ‘long long unsigned int’} due to unsignedness of other
operand [-Wsign-compare]
ret.QuadPart = Pos ? ret64 : -(LONG64)ret64;
^~~~~~~~~~~~~~
Member ret.QuadPart is of type LONGLONG, so explicitly cast both parts of
ret64 ternary operator to LONG64.
---
mingw-w64-headers/ddk/include/ddk/wdm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mingw-w64-headers/ddk/include/ddk/wdm.h
b/mingw-w64-headers/ddk/include/ddk/wdm.h
index 64bcbc5c74b5..c2c547730b39 100644
--- a/mingw-w64-headers/ddk/include/ddk/wdm.h
+++ b/mingw-w64-headers/ddk/include/ddk/wdm.h
@@ -9528,7 +9528,7 @@ RtlExtendedMagicDivide(
ret64 = UnsignedMultiplyHigh(Pos ? Dividend.QuadPart : -Dividend.QuadPart,
MagicDivisor.QuadPart);
ret64 >>= ShiftCount;
- ret.QuadPart = Pos ? ret64 : -(LONG64)ret64;
+ ret.QuadPart = Pos ? (LONG64)ret64 : -(LONG64)ret64;
return ret;
}
#endif
--
2.20.1
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