Re: [libvirt] New compile failure on OSX: CLOCK_REALTIME undeclared

On 11/07/2010 01:35 AM, Justin Clift wrote: > Hi Eric, > > When running 'make check' on OSX (git head) it's erroring out with: > > eventtest.c: In function 'finishJob': > eventtest.c:216: warning: implicit declaration of function 'clock_gettime' > eventtest.c:216: warning: nested extern declaration of 'clock_gettime' [-Wnested-externs] > eventtest.c:216: error: 'CLOCK_REALTIME' undeclared (first use in this function) > eventtest.c:216: error: (Each undeclared identifier is reported only once > eventtest.c:216: error: for each function it appears in.) > make[3]: *** [eventtest.o] Error 1 > make[2]: *** [check-am] Error 2 > make[1]: *** [check-recursive] Error 1 > make: *** [check-recursive] Error 1 > $ > > Looks like the CLOCK_REALTIME is a glibc Linux thing. It's in /usr/include/time/bits.h on > a F13 box. CLOCK_REALTIME is optional in C99, but required by POSIX: http://www.opengroup.org/onlinepubs/9699919799/basedefs/time.h.html#tag_1... However, gnulib doesn't yet work around this deficiency: http://www.gnu.org/software/gnulib/manual/gnulib.html#clock_005fgettime Portability problems not fixed by Gnulib: * This function is missing on some platforms: MacOS X 10.3, IRIX 5.3, Solaris 2.4, mingw, Interix 3.5, BeOS. > > Any idea if gnulib can be used to get around this? It might be possible, if we can come up with a portable way to get a decent substitution of reasonable time on all of those platforms. Right now, the gnulib clock-time module is GPL, and merely checks whether clock_{get,set}time are available, and if so, in what library (although since the module only consists of a single .m4 file, it should be trivial to relicense it to LGPLv2+).