static linking of librdkafka.a needs dynamic pthreads linking about librdkafka HOT 7 CLOSED

This was 8 years ago so no, I no longer have the command ;)

from librdkafka.

Hi,

no, I havent seen this one before.

Some questions:

• Does it happen on each execution of your program?
• Does it rely on a certain number or set of brokers?
• Is it reproducible with the rdkafka_example program?
• Are you linking your program statically? I found this: https://sourceware.org/bugzilla/show_bug.cgi?id=10652

from librdkafka.

Hi Magnus,

To answer your questions:
Yes - happens every time
No - doesn't matter the number
No - doesn't happen on the example program, or even my own sample program
Yes - I think this is almost certainly the problem. I have a binary
which does a dlopen on a shared library that I wrote. That shared library
is statically linked to librdkafka.a. Based on the link you sent, I
wasn't sure if a final solution was found? From your reading, does it
mean I have to change how you build librdkafka.a to link in pthread?

On Fri, Dec 27, 2013 at 2:35 AM, Magnus Edenhill
[email protected]:

Hi,

no, I havent seen this one before.

Some questions:

• Does it happen on each execution of your program?
• Does it rely on a certain number or set of brokers?
• Is it reproducible with the rdkafka_example program?
• Are you linking your program statically? I found this:
  https://sourceware.org/bugzilla/show_bug.cgi?id=10652

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/34#issuecomment-31250326
.

from librdkafka.

From what I understand you may link your program statically with librdkafka, but you need to link it dynamically with pthreads.
Can you try that?

from librdkafka.

Success! (Although it feels weird to make my single threaded binary link
with pthread just 'in case' one of the .so's I dlopen happens to use
threads, but I think I can deal with that :) )

On Fri, Dec 27, 2013 at 6:14 AM, Magnus Edenhill
[email protected]:

From what I understand you may link your program statically with
librdkafka, but you need to link it dynamically with pthreads.
Can you try that?

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/34#issuecomment-31256767
.

from librdkafka.

Thing is that librdkafka is threaded (one thread per rd_kafka_t + one thread for each broker), and each broker thread will try to resolve its broker address using getaddrinfo(), and thats where it fails :)

from librdkafka.

Success! (Although it feels weird to make my single threaded binary link with pthread just 'in case' one of the .so's I dlopen happens to use threads, but I think I can deal with that :) )

On Fri, Dec 27, 2013 at 6:14 AM, Magnus Edenhill [email protected]:

From what I understand you may link your program statically with
librdkafka, but you need to link it dynamically with pthreads.
Can you try that?
—
Reply to this email directly or view it on GitHubhttps://github.com//issues/34#issuecomment-31256767
.

Hi, can I know the command to statically link the librdkafka that you have success on?

Thanks.

from librdkafka.