Error massege after linking refblas and lapack 3.4

[shubham111gupta]

I am trying to compile a program on mac using following command
g++-4.2 main.cpp -o testProduct -L/Users/shubhamgupta/LAPACK/lapack-3.4.0/ -l refblas -l lapack

The program has call for
zgelss_
and
zgemm_

I am getting following errors

Undefined symbols for architecture x86_64:
"__gfortran_st_write", referenced from:
_xerbla_ in librefblas.a(xerbla.o)
"__gfortran_string_len_trim", referenced from:
_xerbla_ in librefblas.a(xerbla.o)
"__gfortran_transfer_character", referenced from:
_xerbla_ in librefblas.a(xerbla.o)
"__gfortran_transfer_integer", referenced from:
_xerbla_ in librefblas.a(xerbla.o)
"__gfortran_st_write_done", referenced from:
_xerbla_ in librefblas.a(xerbla.o)
"__gfortran_stop_numeric", referenced from:
_xerbla_ in librefblas.a(xerbla.o)
"__gfortran_concat_string", referenced from:
_zunmqr_ in libreflapack.a(zunmqr.o)
_zunmlq_ in libreflapack.a(zunmlq.o)
"__gfortran_compare_string", referenced from:
_ilaenv_ in libreflapack.a(ilaenv.o)
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

I dont under stand where I was wrong
may during Installing
FYI
I used gfotran 4.4 -O2 .......
for Installing the refBlas and Lapack

[Julien Langou]

something like:

Code: Select all

g++-4.2 main.cpp -o testProduct -L/Users/shubhamgupta/LAPACK/lapack-3.4.0/  -llapack -lrefblas -lgfortran


[shubham111gupta]

Thank you for reply
but I am not able to locate
libgfortran.a
or any library that could be linked in this way

though I see a file
make.inc.gfortran in
LAPACK folder of mine

do I have make for that too

if yes then please tell how

Thank you again

[admin]

just add -lgfortran in your linking sequence.
As LAPACK is in FORTRAN, the Fortran libraries are needed at linking time.

On Mac OS/X you also have BLAS and LAPACK incorporated in the Mac Accelerate framework
g++-4.2 main.cpp -o testProduct -framework accelerate
should work. Maybe also add -lgfortran, but I think it should work without it.
Julie

[shubham111gupta]

Dear admin
I have located the file any way and compiled my program

I do not want to use accelerate framework in sdk10.6 is not thread safe

I have further question which is I guess is more of a performance issue at multithreading
hence I have posted it there

viewtopic.php?f=6&t=3115

Please Reply

Thankyou