Hi Ger,
thanks a lot
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..
There is libpthread.so in /usr/lib and /usr/lib64. I assume these
should be found by configure ;-). Setting LD_LIBRARY_PATH to /usr/lib64
didn't help.
Also, check to make sure IlmBase and OpenEXR are both build with
'--enable-threading' turned on (this is the default).
I made sure by adding this option to my configure commands, but the
error is still there.
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
-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'
I have no software development knowledge and therefore these error
messages are somehow cryptic to me. But I see, that libIlmThread.so
does not refer (link?) to pthread.so at all:
openexr-1.6 > ldd ../../lib/libIlmThread.so
libIex.so.6 => /usr/struct/pack/openexr-1.6/lib/libIex.so.6
(0x00002ae626943000)
libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00002ae626b60000)
libm.so.6 => /lib64/libm.so.6 (0x00002ae626e80000)
libc.so.6 => /lib64/libc.so.6 (0x00002ae627104000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00002ae62745a000)
/lib64/ld-linux-x86-64.so.2 (0x00000031e8c00000)
openexr-1.6 >
Could that be the problem and is there a way to fix it?
frank
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