At Sun, 24 Jun 2007 17:35:25 +0400, Sergey Vlasov wrote:
On Fri, Oct 06, 2006 at 11:01:44AM +0200, Jaroslav Kysela wrote:
changeset: 2218:603411fd0c77712cab43cdd5afcf0ff4ebe51a7f tag: tip user: perex date: Fri Oct 06 11:01:40 2006 +0200 files: include/global.h description: Add struct timeval and timespec definition when _POSIX_C_SOURCE is not defined
FIXME: It might cause problems on some platforms when tv_usec is not long type.
And now it also breaks compilation of the following code (at least with glibc 2.5):
#include <sys/select.h> #include <alsa/global.h>
$ gcc -c --std=c99 x.c In file included from x.c:2: /usr/include/alsa/global.h:134: error: redefinition of 'struct timeval' /usr/include/alsa/global.h:139: error: redefinition of 'struct timespec'
(Without #include <sys/select.h> only 'struct timespec' is redefined.)
IMHO attempts to define structures which should be defined by system headers are too dangerous - if someone is using preprocessor flags which hide required parts of system headers, it is their problem, and the risk of mismatch is too high.
I agree.
Jaroslav, which system has no definition of these types? Maybe it'd be better to check it in configure script, rather than the simple ifdef.
BTW, <time.h> does not provide 'struct timeval' at all, even with _GNU_SOURCE - it defines only 'struct timespec'; however, this does not cause problems, because ALSA headers currently use only pointers to snd_timestamp_t, which works even without a complete definition of 'struct timeval'. We can try to include <sys/time.h> to get 'struct timeval', or even <sys/select.h> (which currently seems to provide both 'struct timeval' and 'struct timespec' even with -ansi, and http://www.opengroup.org/onlinepubs/009695399/basedefs/sys/select.h.html tells that it should always provide their definitions).
A patch is welcome :)
thanks,
Takashi