Linking LAPACK/BLAS libraries

Posted by Daniel Bremberg on Stack Overflow See other posts from Stack Overflow or by Daniel Bremberg
Published on 2010-05-10T08:31:55Z Indexed on 2010/05/11 0:14 UTC
Read the original article Hit count: 645

Filed under:

linking

|

blas

|

lapack

|

c

|

fortran77

Background:
I am working on a project written in a mix of C and Fortran 77 and now need to link the LAPACK/BLAS libraries to the project (all in a Linux environment). The LAPACK in question is version 3.2.1 (including BLAS) from netlib.org. The libraries were compiled using the top level Makefile (make lapacklib and make blaslib).

Problem:
During linking, error messages claimed that certain (not all) BLAS-routines called from LAPACK-routines were undefined. This gave me some headache but the problem was eventually solved when (in the Makefile) the order of appearance of the libraries to be linked was changed.

Code:
In the following, (a) gives errors while (b) does not. The linking is performed by (c).
(a) LIBS = $(LAPACK)/blas_LINUX.a $(LAPACK)/lapack_LINUX.a
(b) LIBS = $(LAPACK)/lapack_LINUX.a $(LAPACK)/blas_LINUX.a
(c) gcc -Wall -O -o $@ project.o project.a $(LIBS)

Question:
What could be the reason for the undefined references of only some routines and what makes the order of appearance relevant?

© Stack Overflow or respective owner

Related posts about linking

Linking Secrets - Part I - Linking Structure

as seen on Ezine Articles - Search for 'Ezine Articles'
Google classes a link as a 'vote' for your website, as most people only link to a site if they are talking about it or referring to it as a good resource. This means the almighty link has become a huge factor in how well you rank in the search engines. >>> More
dynamic linking:change of the linking path.

as seen on Stack Overflow - Search for 'Stack Overflow'
Normally it happens that when ever the path of the library that has to be linked dynamically is defined in LD_LIBRARY_PATH or it it will be mentioned with -L flag while creating the binary. In actual scenario if ,lets say the binary has been built and deployed at the client place. Now if there… >>> More
C++ linking error when linking postgresql

as seen on Stack Overflow - Search for 'Stack Overflow'
When compiling my code I run into an issue as follows: io.cpp:21: undefined reference to `PQconnectdb' as well as all other instances of missing postgres function calls occurring in my code. Obviously this is a linking problem, I'm just not sure what the link issue is. I'm compiling with the… >>> More
jQuery Templates and Data Linking (and Microsoft contributing to jQuery)

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
The jQuery library has a passionate community of developers, and it is now the most widely used JavaScript library on the web today. Two years ago I announced that Microsoft would begin offering product support for jQuery, and that we’d be including it in new versions of Visual Studio going forward… >>> More
Boost.Thread Linking - boost_thread vs. boost_thread-mt

as seen on Stack Overflow - Search for 'Stack Overflow'
It's not clear to me what linking options exist for the Boost.Thread 1.34.1 library. I'm on Ubuntu 8.04 and I've found that using eitherr boost_thread or boost_thread-mt during linking both compile and run, but I don't see any documentation on these or any other linking options in above link. What… >>> More

Related posts about blas

CMake and BLAS for a C program

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to use CMake to build a program relying on blas, I'm detecting blas using : include (${CMAKE_ROOT}/Modules/FindBLAS.cmake) The problem is, FindBLAS require a fortran compiler and complain with -- Looking for BLAS... - NOT found (Fortran not enabled) As blas is already installed on… >>> More
BLAS and CUBLAS

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm wondering about Nvidia's CUBLAS Library. Does anybody have experience with it? For example if I write a C program using BLAS will I be able to replace the calls to BLAS with calls to CUBLAS? Or even better implement a mechanism which let's the user choose at runtime? What about if I use the BLAS… >>> More
Linking LAPACK/BLAS libraries

as seen on Stack Overflow - Search for 'Stack Overflow'
Background: I am working on a project written in a mix of C and Fortran 77 and now need to link the LAPACK/BLAS libraries to the project (all in a Linux environment). The LAPACK in question is version 3.2.1 (including BLAS) from netlib.org. The libraries were compiled using the top level Makefile… >>> More
What is BLAS DGEMV error code -6 mean?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a program that runs through R but uses the BLAS routines. It runs through correctly about 8 times but then throws an error BLAS/LAPACK routine 'DGEMV ' gave error code -6 What does this error code mean. I cant find the answer online but I'm sure there is someone here that knows it. >>> More
Compiling a c++ project using blas (Fortran) in Matlab mex

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to use a package here. I have no problem compiling it under 64-bit Linux as all the Makefiles are already provides. Only minor changes are needed, which I can handle. However, I have a problem compiling it under 64-bit Windows. I have installed gfortran and also compiled BLAS and CBLAS… >>> More