There was a patch made to _ip_types.h and winsock.h in 2012 that I wish had
been made differently. All the function prototypes using timeval* were changed
to use PTIMEVAL. I think it would have been better to change the typedef for
'timeval' for LP64 instead.
I'm working with a library, which, for better or for worse, uses a cast for the
final argument in 'select'. So with -Wall, the code:
#include <time.h>
#include <windows.h>
void sub()
{
struct timeval tv;
select(0, 0, 0, 0, (const struct timeval *)&tv);
}
gets a warning:
tt.c: In function 'sub':
tt.c:8:24: warning: passing argument 5 of 'select' discards 'const' qualifier
from pointer target type [-Wdiscarded-qualifiers]
select(0, 0, 0, 0, (const struct timeval *)&tv);
^
In file included from
C:/TDM-GCC-64-5.1.0-2/x86_64-w64-mingw32/include/windows.h:92:0,
from tt.c:2:
C:/TDM-GCC-64-5.1.0-2/x86_64-w64-mingw32/include/winsock.h:299:34: note:
expected 'PTIMEVAL {aka struct timeval * const}' but argument is of type 'const
struct timeval *'
WINSOCK_API_LINKAGE int WSAAPI select(int nfds,fd_set *readfds,fd_set
*writefds,fd_set *exceptfds,const PTIMEVAL timeout);
'gcc' has never been good enough to treat "equal" type declarations as the
"same" when checking for this sort of error.
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