Armadillo compilation problem

corydalus · 02-02-2011, 03:29 AM

When trying to compile Armadillo on a computer cluster I get the following error after running "cmake ." (works OK) and "make":

/usr/bin/ld: /share/apps/opt_intel/lib/libblas.a(dgemm.o): relocation R_X86_64_32 against `a local symbol' can not be used when making a shared object; recompile with -fPIC
/share/apps/opt_intel/lib/libblas.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
make[2]: *** [libarmadillo.so.1.0.2] Error 1
make[1]: *** [CMakeFiles/armadillo.dir/all] Error 2
make: *** [all] Error 2

cmake says it has successgully found BLAS, but there is still a linking problem. How can I deal with it?

knudfl · 02-02-2011, 06:41 AM

Welcome to LQ.

"".. recompile with -fPIC"" :
Means, that a shared library, liblapack.so is required.

Quote:

-- Found a LAPACK library: /usr/lib/liblapack.so
-- Found a BLAS library: /usr/lib/libblas.so
-- Found a CLAPACK library: /usr/lib/atlas/libclapack.so
-- Found a CBLAS library: /usr/lib/atlas/libcblas.so

Good luck !

P.S. : cd armadillo-1.0.2/ && mkdir build && cd build/
&& cmake .. && make :
Most "cmake applications" require a build directory.

..

corydalus · 02-02-2011, 07:08 AM

Thank you for your reply, knudfl, but it looks like cmake has found the liblapack.so. It says:

Code:

-- Found a LAPACK library: /usr/lib/liblapack.so
-- Found a BLAS library: /usr/lib/libblas.so
-- LAPACK_FOUND  = YES
-- BLAS_FOUND    = YES
-- CLAPACK_FOUND = NO
-- CBLAS_FOUND   = NO
-- *** 
-- *** The Armadillo run-time library component will be an alias for the following libraries:
-- *** ARMA_LIBS = /usr/lib/libblas.so;/usr/lib/liblapack.so
-- ***

knudfl · 02-02-2011, 07:21 AM

May be hide away this, while you are compiling :
""/share/apps/opt_intel/lib/libblas.a""

Not much help, that the "cmake configure" finds libblas.so,
when ld has libblas.a first in its search path.

..