Hi all,
Did MinGW-w64 GCC change behavior at some point regarding printf and long long?
My understanding is that you should use the Microsoft non-standard specifiers
%I64d and %I64u and my GCC 4.5.1 is fine with it, but I get the following
warning because of that in GCC 4.7.1 (rubenvb's build):
F:/workspace/ACSL/ToString.h:628:9: warning: format '%u' expects argument of
type 'unsigned int', but argument 3 has type 'long long unsigned int' [-Wformat]
for the following code
template <size_t L> inline void printToBuffer(unsigned long long value,
char (&buffer)[L]) {#ifdef WIN32 std::sprintf(buffer, "%I64u",
value);#else std::sprintf(buffer, "%llu", value);#endif }
If this is a spurious warning, I can use -Wno-format to suppress it (this
inline method gets included a LOT of places in my code) but of course that
loses the ability of using that warning as a legitimate way to warn about
printf bugs.
... also, copying that code, I realized that it's a buffer overrun risk.
Yikes.
Gregory Peele Jr.
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