Re: OpenEXR 1.6.1 build problem (Linux): "configure: error: Could not compile IlmBase test program"

Off the cuff, by only looking at the functions that are reported
missing by the linker, my first guess would be that the configure
script couldn't find a viable pthread library. This most probably
happened to the ./configure for IlmBase as IlmThread wraps those, the
effect becoming 'visible' once you compile&link OpenEXR itself..

Also, check to make sure IlmBase and OpenEXR are both build with
'--enable-threading' turned on (this is the default).


> configure:20491: g++ -o conftest -g -O2
> -I/usr/struct/pack/openexr-1.6/include/OpenEXR
> -L/usr/struct/pack/openexr-1.6/lib -L/usr/lib64 -L/usr/local/lib conftest=
.cc
> =A0-lImath -lHalf -lIex -lIlmThread >&5
> /usr/struct/pack/openexr-1.6/lib/libIlmThread.so: undefined reference to
> `sem_init'
> /usr/struct/pack/openexr-1.6/lib/libIlmThread.so: undefined reference to
> `sem_destroy'
> /usr/struct/pack/openexr-1.6/lib/libIlmThread.so: undefined reference to
> `pthread_create'
> /usr/struct/pack/openexr-1.6/lib/libIlmThread.so: undefined reference to
> `sem_post'
> /usr/struct/pack/openexr-1.6/lib/libIlmThread.so: undefined reference to
> `sem_trywait'
> /usr/struct/pack/openexr-1.6/lib/libIlmThread.so: undefined reference to
> `sem_getvalue'
> /usr/struct/pack/openexr-1.6/lib/libIlmThread.so: undefined reference to
> `sem_wait'
> /usr/struct/pack/openexr-1.6/lib/libIlmThread.so: undefined reference to
> `pthread_join'

--=20
Met vriendelijke groeten / Best regards,

Ger Hobbelt

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