package/libupnpp: add patch to fix build issue
authorJörg Krause <joerg.krause@embedded.rocks>
Tue, 13 Sep 2016 13:35:02 +0000 (15:35 +0200)
committerThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tue, 13 Sep 2016 19:27:35 +0000 (21:27 +0200)
commit9ecb1b858c1ed5b625ed942d32f040a67e8355d2
treef560efa4b4814410f4aa81065399bd7997402612
parent0d7383a0a7f5c69cb0e4a4eb0d32d2536cd7e0e8
package/libupnpp: add patch to fix build issue

Bumping libupnpp to version 0.15.0 introduced a build error for some
architectures:

```
./libupnpp/workqueue.h:308:29: error: field 'res' has incomplete type
         std::future<void *> res;
                             ^
./libupnpp/workqueue.h: In member function 'bool
WorkQueue<T>::start(int, void* (*)(void*), void*)':
./libupnpp/workqueue.h:81:25: error: invalid use of incomplete type
'class std::packaged_task<void*(void*)>'
             w.res = task.get_future();
```

The problem is that `std::future` is not available for all
architectures, e.g. it is missing for ARMv5 (soft-float). libstdc++
enables `std::future` only if `ATOMIC_INT_LOCK_FREE > 1`, which
according the the libstdc++ documentation means that operations on
atomic ints are guaranteed to be lock-free.

This check is not true for some target, e.g. the toolchain for the
ARMv5 target defines:

```
$ echo | /usr/bin/arm-linux-g++ -dM -E - | grep ATOMIC_INT_LOCK_FREE
#define __GCC_ATOMIC_INT_LOCK_FREE 1

```

We add a patch from upstream which detects if `std::future` is available
and opts-out the functionality for unsupported targets.

Fixes:
http://autobuild.buildroot.net/results/f8eb38ef79160e1f646dae0be19f27fae82a58bc
http://autobuild.buildroot.net/results/158e0ceeff009146b78a0d2bb278c76479bafc34
http://autobuild.buildroot.net/results/1760cf53c77e16bb2b5bc795bd0ce5eb65f258f2
http://autobuild.buildroot.net/results/5b73e52495aa1bbb2c704492237da784b9d74bc2
http://autobuild.buildroot.net/results/6d922a1bbace024fcf040beb49bbb119036865ef
http://autobuild.buildroot.net/results/bebb8983e7579ee4b4bcf18f037c7797ab86f8db
http://autobuild.buildroot.net/results/0f1a5832ced2a6ec2e18f9f14197446fda6af692
http://autobuild.buildroot.net/results/94a9cc349f23a47246b06619a019bcb917493415
http://autobuild.buildroot.net/results/19fba094098af5c1ce1e1371e5e88393c4a6ac9c
http://autobuild.buildroot.net/results/578935b5c04005d1f096059387d16911f953ec6f
http://autobuild.buildroot.net/results/2ad698f1665b7b886141672181cb76ec3c40a743

and more...

Note, that we enable autoreconf as the patch touches configure.ac.

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
package/libupnpp/0001-Check-for-std-future.patch [new file with mode: 0644]
package/libupnpp/libupnpp.mk