Armadillo C++ and BLAS and ATLAS cannot find lapack blas under mingw32

Question

All,

Summary ...

I am trying to compile example.cpp of arma.sourceforge.net/docs.html#example_prog

I try to compile and link armadillo with lapack and blas. I am always getting the same error back. This message is returned

ld.exe: cannot find -llapack
ld.exe: cannot find -lblas

I verified that all of my paths below are correct and ran the following.

g++ example.cpp -o example -O1  -I..\..\lapackblas_headers\lapack -I..\..\lapackblas_headers\blas  -I..\include 

-L....\lapackblas_MD_debug -llapack -lblas

This message is returned

ld.exe: cannot find -llapack
ld.exe: cannot find -lblas

FROM

f:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../../mingw32/bin/ld.exe: cannot find -llapack
f:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../../mingw32/bin/ld.exe: cannot find -lblas

collect2: ld returned 1 exit status

Andre Mikulec Andre_Mikulec@Hotmail.com

Details follow ...

I downloaded pre-compiled versions of LAPACK and BLAS were downloaded from ... http://www.fi.muni.cz/~xsvobod2/misc/lapack/

I am following the instructions here

https://sourceforge.net/projects/arma/files/latest/download
http://sourceforge.net/projects/arma/files/armadillo-3.800.0.tar.gz
file:///M:/YDrive/All_Economics/eclipse_workspace/armadillo-3.800.0/README.txt

From

arma.sourceforge.net/download.html#windows

I have lapack and blas libraries

ls -alrt ../../lapackblas-MD-debug

-rw-r--r--  1 Administrator Administrators   27092 Oct  5  2009 blas_win32_MDd.lib
-rwxr-xr-x  1 Administrator Administrators  280576 Oct  5  2009 blas_win32_MDd.dll
-rw-r--r--  1 Administrator Administrators  254886 Oct  5  2009 lapack_win32_MDd.lib
-rwxr-xr-x  1 Administrator Administrators 3774464 Oct  5  2009 lapack_win32_MDd.dll
drwxr-xr-x  2 Administrator Administrators       0 Mar  3 08:02 .
drwxr-xr-x 10 Administrator Administrators       0 Mar  3 08:06 ..

ls -alrt ../../lapackblas_headers/blas

MANYFILES.h

ls -alrt ../../lapackblas_headers/lapack

MANYFILES.h

ls -alrt ../include

MANYFILES.h

I try to compile and link armadillo with lapack and blas. I am always getting the same error back.

M:
cd \YDrive\All_Economics\eclipse_workspace\armadillo-3.800.0\examples

M:\YDrive\All_Economics\eclipse_workspace\armadillo-3.800.0\examples>

I tried relative paths

g++ example.cpp -o example -O1  -I..\..\lapackblas_headers\lapack -I..\..\lapackblas_headers\blas  -I..\include 

-L..\..\lapackblas_MD_debug -llapack -lblas 

I tried absolute paths

g++ example.cpp -o example -O1  -IM:\YDrive\All_Economics\eclipse_workspace\lapackblas_headers\lapack  

-IM:\YDrive\All_Economics\eclipse_workspace\lapackblas_headers\blas  

-IM:\YDrive\All_Economics\eclipse_workspace\armadillo-3.800.0\include 

-LM:\YDrive\All_Economics\eclipse_workspace\lapackblas_MD_debug -llapack -lblas

In all cases returned information is here

ld.exe: cannot find -llapack
ld.exe: cannot find -lblas

f:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../../mingw32/bin/ld.exe: cannot find -llapack
f:/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../../mingw32/bin/ld.exe: cannot find -lblas
collect2: ld returned 1 exit status

Any ideas?

Thank you. Andre Mikulec Andre_Mikulec@Hotmail.com

Answer 1

I found the partial solution.

g++ -o example example.cpp ..\..\lapackblas_MD_debug\blas_win32_MDd.dll ..\..\lapackblas_MD_debug\lapack_win32_MDd.dll -O1  -I..\..\lapackblas_headers\lapack -I..\..\lapackblas_headers\blas  -I..\include 

This page explains it. http://www.mingw.org/wiki/MSVC_and_MinGW_DLLs

Basically, I needed to specify the DLL files directly on the command line after the main program

Also, to FINISH TO SOLUTION, I have to install the (yet) dependent DLLs from an Intel Fortran compiler ( or 30 day eval ).

This page ( were I aquired the DLLs ) explains it ( in the fine print ).

LAPACK & BLAS precompiled binaries for Win32 platform
http://www.fi.muni.cz/~xsvobod2/misc/lapack/