ACE_Atomic_OP export issue

[Daniel Stefan Reichenbach]

There seems to be an issue with linking applications built with clang against ACE.

I do use ace/Atomic_Op.h and have a private variable in a class like

ACE_Atomic_Op <ACE_Thread_Mutex, long> m_refs;

This will throw an error like

../../lib/libmangos-shared.a(Threading.cpp.o): In function `ACE_Atomic_Op<ACE_Thread_Mutex, long>::operator=(long)':
/usr/include/ace/Atomic_Op.inl:168: undefined reference to `ACE_Atomic_Op<ACE_Thread_Mutex, long>::exchange_fn_'

In Ubuntu 12.04 LTS using ACE 6.0.1 this was working fine. I could not find any entries in the ACE Changelogs for version 6.0.3 relating to this.

Description: Ubuntu 13.10
Release: 13.10

libace-6.0.3:
  Installed: 6.0.3+dfsg-0.1
  Candidate: 6.0.3+dfsg-0.1
  Version table:
 *** 6.0.3+dfsg-0.1 0
        500 http://de.archive.ubuntu.com/ubuntu/ saucy/universe amd64 Packages
        100 /var/lib/dpkg/status

libace-dev:
  Installed: 6.0.3+dfsg-0.1
  Candidate: 6.0.3+dfsg-0.1
  Version table:
 *** 6.0.3+dfsg-0.1 0
        500 http://de.archive.ubuntu.com/ubuntu/ saucy/universe amd64 Packages
        100 /var/lib/dpkg/status

[Pau Garcia Quiles (pgquiles)]

Are you still suffering from this issue with the latest version of ACE?

[Daniel Stefan Reichenbach (marenkay)]

I just found the solution to the issue two days ago.

Changing the code to

ACE_Atomic_Op<ACE_Thread_Mutex, int> m_refs;

solves the issue and works fine, thus the issue can be closed.

[yehonal (hw-2)]

I've this issue too, but i'm forced to use long instead int.

however it happens only with clang , gcc compiles.

Could someone help me to make this work?

stack overflow post: http://stackoverflow.com/questions/38953849/libace-and-clang-clang-undefined-reference-to-ace-atomic-opace-thread-mutex?noredirect=1&lq=1

[yehonal (hw-2)]

i'm using ubuntu 16.06 , clang++ 3.8 and libace 6.3.3

[Johnny Willemsen (jwillemsen)]

This has been fixed in ACE 6.4.3, see https://stackoverflow.com/questions/38953849/libace-and-clang-clang-undefined-reference-to-ace-atomic-opace-thread-mutex?noredirect=1&lq=1

[Johnny Willemsen (jwillemsen)]

Fixed in ACE 6.4.3