Build Error: "undefined reference to `pthread_rwlock_{destroy,rdlock,init,unlock,wrlock}'

[ghost]

I follow the build instructions on the Readme:

git clone https://github.com/ptillet/isaac.git
mkdir -p isaac/build && cd isaac/build
cmake ../ && make -j4

..and I get this build error:

cathal@thinkum:~/Projects/isaac/build$ make -j4
[  2%] Built target bin2cpp
[  5%] Built target headers
[  5%] Built target database_amd
[  8%] Built target database_unknown
[  8%] Built target database_intel
[ 14%] Built target database_nvidia
[ 71%] Built target isaac
[ 77%] Built target test-element-1d
[ 77%] Built target test-blas-3
[ 83%] Built target test-blas-2
[ 83%] Built target test-blas-1
[ 85%] Built target test-element-2d
[ 88%] Built target test-reduce-2d
[ 91%] Built target test-reduce-1d
[ 94%] Built target test-fusion
[ 98%] Built target example-indexing
[ 98%] Linking CXX executable bench-blas
/home/cathal/torch-cl/install/lib/libclBLAS.so: undefined reference to `pthread_rwlock_destroy'
/home/cathal/torch-cl/install/lib/libclBLAS.so: undefined reference to `pthread_rwlock_rdlock'
/home/cathal/torch-cl/install/lib/libclBLAS.so: undefined reference to `pthread_rwlock_init'
/home/cathal/torch-cl/install/lib/libclBLAS.so: undefined reference to `pthread_rwlock_unlock'
/home/cathal/torch-cl/install/lib/libclBLAS.so: undefined reference to `pthread_rwlock_wrlock'
collect2: error: ld returned 1 exit status
bench/CMakeFiles/bench-blas.dir/build.make:96: recipe for target 'bench/bench-blas' failed
make[2]: *** [bench/bench-blas] Error 1
CMakeFiles/Makefile2:1663: recipe for target 'bench/CMakeFiles/bench-blas.dir/all' failed
make[1]: *** [bench/CMakeFiles/bench-blas.dir/all] Error 2
Makefile:138: recipe for target 'all' failed
make: *** [all] Error 2

I don't see a reference in a non-binary file to 'pthread' when I sift for it, but it's matched in lots of object files. So, perhaps it's just missing somewhere from the Makefiles...but I don't grok the C build system. :/

[ptillet]

Oh. I think that clBLAS has been adding and removing pthread as a dependency a couple of times. Your version of clBlas seems to require pthread while mine doesn't. ISAAC itself doesn't depend on pthread.

I've modified the build system so that it always links against pthread when clBlas is detected. Can you pull and retry?

[ghost]

Wow, fast turnaround, thank you! I'll pull and retry within the hour. :)

…

On 20 January 2017 22:23:03 GMT+00:00, Phillippe Tillet ***@***.***> wrote: Oh. I think that clBLAS has been adding and removing pthread as a dependency a couple of time. Your version of clBlas that cmake wants to benchmark again seems to require pthread. Isaac itself doesn't depend on pthread. I've modified the build system so that it always links against pthread when clBlas is detected. Can you pull and retry? -- You are receiving this because you authored the thread. Reply to this email directly or view it on GitHub: #14 (comment)

-- Sent from my Android device with K-9 Mail. Please excuse my brevity.

[ghost]

It built! :)

Now, I have a new problem.. if I immediately follow that up with ./bench/bench-blas, it segfaults with no output!

Perhaps this merits another issue..

[ptillet]

Is the issue solved with the segfault? This usually comes from a machine configuration issue (such as launching on machines with bumblebee without optirun)