On Sat, Oct 25, 2014 at 2:38 PM, George Mitchell <george+free...@m5p.com> wrote:
> In the process of building and trying textproc/meld, I discovered that > the lang/python27 configure process concludes, erroneously, that FreeBSD > does not support working Posix semaphores. In particular, this program > from the configure script was alleged to fail, according to config.log: > > #include <unistd.h> > #include <fcntl.h> > #include <stdio.h> > #include <semaphore.h> > #include <sys/stat.h> > > int main(void) { > sem_t *a = sem_open("/autoconf", O_CREAT, S_IRUSR|S_IWUSR, 0); > if (a == SEM_FAILED) { > perror("sem_open"); > return 1; > } > sem_close(a); > sem_unlink("/autoconf"); > return 0; > } > > But when I compiled and ran the program by hand, it worked perfectly. > > Then, poking around in lang/python27/Makefile, I found these two lines: > > SEM_CONFIGURE_ENV= ac_cv_posix_semaphores_enabled=yes > SEM_CONFIGURE_ENV_OFF= ac_cv_posix_semaphores_enabled=no > > I could not explain why these settings should have any effect on the > configure and build process, but muttering my most superstitious > imprecations under my breath I changed "...=no" to "...=yes" in the > second line and re-installed Python. Lo and behold, configure now > admitted that Posix semaphores worked, and I could run meld. (Why > meld needs working semaphores is beyond me, but I'll worry about that > another day.) > > Can anyone explain to me how those lines affect the configure process? > And does either line belong in the Makefile at this point? -- George > There is a config option called "SEM" which enables Posix sem support. By default it is enabled. > _______________________________________________ > freebsd-ports@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-ports > To unsubscribe, send any mail to "freebsd-ports-unsubscr...@freebsd.org" > -- Cheers, Henry _______________________________________________ freebsd-ports@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-ports To unsubscribe, send any mail to "freebsd-ports-unsubscr...@freebsd.org"