net/ice/base: define add-overflow builtin for MSVC

__builtin_add_overflow is gcc specific. A macro needs to be defined
for code using this to be compiled with MSVC.
Since only one driver is using this, this patch adds the macro to
that driver only. It can be moved to some common place if/when
needed.

Signed-off-by: Andre Muezerie <[email protected]>
Acked-by: Bruce Richardson <[email protected]>
Acked-by: Morten Brørup <[email protected]>

Author: Andre Muezerie

drivers/net/intel/ice/base/ice_osdep.h

@@ -128,6 +128,15 @@ writeq(uint64_t value, volatile void *addr)
 #define wr64(a, reg, value) writeq((value), (a)->hw_addr + (reg))
 #define rd64(a, reg)        readq((a)->hw_addr + (reg))
 
+#ifdef RTE_TOOLCHAIN_MSVC
+#define __builtin_add_overflow(a, b, res) \
+	_Generic((a), \
+		uint8_t : _addcarry_u8, \
+		uint16_t : _addcarry_u16, \
+		uint32_t : _addcarry_u32, \
+		uint64_t : _addcarry_u64)(0, a, b, res)
+#endif
+
 #endif /* __INTEL_NET_BASE_OSDEP__ */
 
 #ifndef __always_unused