bug compiling in gnu g++ in c++0x std

Hello to all. I'm new in graphicsmagick.

I'm going to use Magick++ in a server site application written in
C++2011 and I found a problem when I try to link GraphicsMagick in my
app. But the problem also happens with small programs (i created a
simple main.cpp which just creates an image from disk) like the
demo.cpp in Magick++/demo dir.

Trying to compile without C++0x:

$ g++ -o demo demo.cpp `GraphicsMagick++-config --cppflags --cxxflags
--ldflags --libs`

Everything OK.

But with C++0x enabled (-std=c++0x);

g++ -o demo demo.cpp `GraphicsMagick++-config --cppflags --cxxflags
--ldflags --libs` -std=c++0x
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:127:1:
warning: ‘int __gthrw_pthread_cancel(pthread_t)’ used but never
defined
/tmp/ccsy3HfX.o:(.rodata+0x8e8): undefined reference to
`__gthrw_pthread_cancel(unsigned long)'
collect2: ld returned 1 exit status

I'm using Ubuntu 11.04 32-bit and gcc (Ubuntu/Linaro 4.5.2-8ubuntu4)
4.5.2, but I also tested in a gcc-4.7 in the same machine and the
problem was the same.

The version of GraphicsMagick I'm using in the 1.3.15 one.

When I try to use the native package from ubuntu repository
(1.3.12-1), the error is longer:

/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:118:1:
warning: ‘int __gthrw_pthread_once(pthread_once_t*, void (*)())’
declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:119:1:
warning: ‘void* __gthrw_pthread_getspecific(pthread_key_t) throw ()’
declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:120:1:
warning: ‘int __gthrw_pthread_setspecific(pthread_key_t, const void*)
throw ()’ declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:122:1:
warning: ‘int __gthrw_pthread_create(pthread_t*, const
pthread_attr_t*, void* (*)(void*), void*) throw ()’ declared ‘static’
but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:123:1:
warning: ‘int __gthrw_pthread_join(pthread_t, void**)’ declared
‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:124:1:
warning: ‘int __gthrw_pthread_equal(pthread_t, pthread_t) throw ()’
declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:125:1:
warning: ‘pthread_t __gthrw_pthread_self() throw ()’ declared ‘static’
but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:126:1:
warning: ‘int __gthrw_pthread_detach(pthread_t) throw ()’ declared
‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:127:1:
warning: ‘int __gthrw_pthread_cancel(pthread_t)’ declared ‘static’ but
never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:128:1:
warning: ‘int __gthrw_sched_yield() throw ()’ declared ‘static’ but
never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:130:1:
warning: ‘int __gthrw_pthread_mutex_lock(pthread_mutex_t*) throw ()’
declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:131:1:
warning: ‘int __gthrw_pthread_mutex_trylock(pthread_mutex_t*) throw
()’ declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:134:1:
warning: ‘int __gthrw_pthread_mutex_timedlock(pthread_mutex_t*, const
timespec*) throw ()’ declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:137:1:
warning: ‘int __gthrw_pthread_mutex_unlock(pthread_mutex_t*) throw ()’
declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:138:1:
warning: ‘int __gthrw_pthread_mutex_init(pthread_mutex_t*, const
pthread_mutexattr_t*) throw ()’ declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:139:1:
warning: ‘int __gthrw_pthread_mutex_destroy(pthread_mutex_t*) throw
()’ declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:141:1:
warning: ‘int __gthrw_pthread_cond_broadcast(pthread_cond_t*) throw
()’ declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:142:1:
warning: ‘int __gthrw_pthread_cond_signal(pthread_cond_t*) throw ()’
declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:143:1:
warning: ‘int __gthrw_pthread_cond_wait(pthread_cond_t*,
pthread_mutex_t*)’ declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:144:1:
warning: ‘int __gthrw_pthread_cond_timedwait(pthread_cond_t*,
pthread_mutex_t*, const timespec*)’ declared ‘static’ but never
defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:145:1:
warning: ‘int __gthrw_pthread_cond_destroy(pthread_cond_t*) throw ()’
declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:148:1:
warning: ‘int __gthrw_pthread_key_create(pthread_key_t*, void
(*)(void*)) throw ()’ declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:149:1:
warning: ‘int __gthrw_pthread_key_delete(pthread_key_t) throw ()’
declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:150:1:
warning: ‘int __gthrw_pthread_mutexattr_init(pthread_mutexattr_t*)
throw ()’ declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:151:1:
warning: ‘int __gthrw_pthread_mutexattr_settype(pthread_mutexattr_t*,
int) throw ()’ declared ‘static’ but never defined
/usr/include/c++/4.5/i686-linux-gnu/bits/gthr-default.h:152:1:
warning: ‘int __gthrw_pthread_mutexattr_destroy(pthread_mutexattr_t*)
throw ()’ declared ‘static’ but never defined

Thanks in advance!

-- 
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