On 5/12/06, Bob Young <[EMAIL PROTECTED]> wrote:
checking for pthread_mutexattr_setrobust_np... no
<snip>
checking for pthread_mutexattr_setrobust_np in -lc... yes
threads.c:145: error: `pthread_mutexattr_setrobust_np' undeclared (first use
in this function)
I think the "nptl nptlonly " use flags are relevant to this, but am not
sure. I know the "kerberos" flag is related, but since the box will be
interacting with an Active Directory domain controler kerberos seems
appropiate to have.
Not an nptl issue, looks like a bug in the configure to me.
The configure is finding that glibc has the
pthread_mutexattr_setrobust_np function, so in threads.c it is
activating this piece of code:
# ifdef HAVE_PTHREAD_MUTEXATTR_SETROBUST_NP_IN_THREAD_LIB
|| &pthread_mutexattr_setrobust_np == 0
# endif
However, looking at /usr/include/pthread.h, we find this:
#ifdef __USE_GNU
/* Get the robustness flag of the mutex attribute ATTR. */
extern int pthread_mutexattr_getrobust_np (__const pthread_mutexattr_t *__attr,
int *__robustness) __THROW;
/* Set the robustness flag of the mutex attribute ATTR. */
extern int pthread_mutexattr_setrobust_np (pthread_mutexattr_t *__attr,
int __robustness) __THROW;
#endif
So these functions are GNU only, and a program is supposed to set the
define the __USE_GNU flag if it wants to use them.
This has already been reported to bugzilla, with patches:
http://bugs.gentoo.org/show_bug.cgi?id=125966
If you don't want to try and patch it yourself, try masking out this
version of mit-krb in /etc/portage/package.mask so you build the
previous one.
Comment: Okay...It's available in "-lc" what does that mean?
That the function is available in glibc (GNU libc).
and if it's available why is it causing a build error?
The program didn't see the prototype of the function, because it
didn't define __USE_GNU
Comment: What does "-lc" mean?
Link against the 'c' library. The linker adds a 'lib' prefix and a
'.so' suffix to whatever is passed to the -l option, to come up with
libc.so.
Another example, -lqt means to link against libqt.so.
Would declaring
pthread_mutexattr_setrobust_np as "external" on the condition of some define
solve the problem?
Actually, that _is_ the problem!!
Again sorry for the long post,
No problem, you gave _plenty_ of information to figure out what was
wrong. Always a good thing!
-Richard
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