Re: Python 2.7 and semaphores
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.
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--
Cheers,
Henry
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Re: Python 2.7 and semaphores
On 10/25/14 18:16, Henry Hu wrote: 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. [...] 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. Thanks for the explanation. I must have turned the option off at some point in the past, but I don't remember doing it.-- George ___ 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
Re: Python 2.7 and semaphores
On Sat, Oct 25, 2014 at 7:26 PM, George Mitchell george+free...@m5p.com wrote: On 10/25/14 18:16, Henry Hu wrote: 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. [...] 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. Thanks for the explanation. I must have turned the option off at some point in the past, but I don't remember doing it.-- George I guess that it's a new option, and it seems like that because the old selected options are remembered, the new option is considered as not selected. I think that I've hit this problem before. ___ 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
