LRN wrote:
We've got a complaint about crashes when using g_stat() in glib. Debugging
showed that sizeof stat.st_size == 4 in user application, but sizeof stat
st_size == 8 in glib.
Turns out, MinGW-w64 defines 'off_t' (the type of st_size) as a synonym for
'long', and 'long' is always[1] 32-bit on Windows.
I imagined one had to compile using '-D_FILE_OFFSET_BITS=64' for this.
Try the attached test program.
I'm getting (your case):
_FILE_OFFSET_BITS: not defined
sizeof stat::st_size: 4
and:
_FILE_OFFSET_BITS = 64
sizeof stat::st_size: 8
Also, ref: https://wiki.qt.io/MinGW-64-bit
--
--gv
/*
* Compare to output of:
* gcc -m64 -o gcc-file_offset_bits-test.exe gcc-file_offset_bits-test.c
*
* versus:
* gcc -m64 -D_FILE_OFFSET_BITS=64 -o gcc-file_offset_bits-test.exe
gcc-file_offset_bits-test.c
*/
#include <stdio.h>
static void message (void)
{
#ifdef _FILE_OFFSET_BITS
printf ("_FILE_OFFSET_BITS = %d\n", _FILE_OFFSET_BITS);
#else
printf ("_FILE_OFFSET_BITS: not defined\n");
#endif
}
#include <sys/stat.h>
int main (void)
{
struct stat st;
message();
printf ("sizeof stat::st_size: %u\n", sizeof(st.st_size));
return (0);
}
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