All,
I have a program that I cross-compile for deployment on 32-bit and 64-bit
windows.
The problem that we are seeing is that the exact same code is crashing when
compiled for 64-bit with mingw64 but not crashing when compiled for 32-bit with
mingw32.
Here is a sample of a crash from within GDB:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 3008.0x1294]
0x00000000004c796c in PrefetchDecoder::microsoftDateToISODate (
time=@0x37eecf0) at scan_winprefetch.cpp:122
And here is the function in question; the crash is in the call to gmtime_r():
static string microsoftDateToISODate(const uint64_t &time) {
/**
* See comment above for more information on
* SECONDS_BETWEEN_WIN32_EPOCH_AND_UNIX_EPOCH
*
* Convert UNIX time_t to ISO8601 format
*/
time_t tmp = (time / ONE_HUNDRED_NANO_SEC_TO_SECONDS)
- SECONDS_BETWEEN_WIN32_EPOCH_AND_UNIX_EPOCH;
struct tm time_tm;
gmtime_r(&tmp, &time_tm); /* CRASH HAPPENED HERE; line 122 */
char buf[256];
strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time_tm);
return string(buf);
}
As you can see, there is no way that this should be able to cause a crash.
My question --- do we know that the 64-bit compiler is producing code of the
same quality as the 32-bit compiler?
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