如何将lapack和BLAS库链接到C ++代码 [英] How to Link lapack and BLAS library to C++ code

问题描述

以上是线性代数库.我正在使用armadillo，它类似于c ++包装器/框架，用于链接到fortran中的更多基本线性代数库.

The above are linear algebra libraries. i am using armadillo which is like a c++ wrapper/framework for linking to more basic linear algebra libraries in fortran.

我可以通过使用带有-I标志的gcc -c选项#include"armadillo"来轻松编译example.cpp.这将生成example.o，现在应该将其静态链接到liblapack_LINUX.a和libBLAS_linux.a

I can compile the example.cpp easily by having a #include "armadillo" using gcc -c option with the -I flag. This generates example.o which is now supposed to be linked to liblapack_LINUX.a and libBLAS_linux.a Statically

两者的位置:

liblapack_LINUX.a :-/home/nimish/HTMLProjects/WP2/lib/lapack/
libBLAS_linux.a :-/home/nimish/HTMLProjects/WP2/lib/blas

我发出以下命令:

gcc -o example.o -L../lib/blas -lblas_LINUX -L../lib/lapack -llapack_LINUX

或具有绝对路径的

nimish@ubuntu:~$ gcc -o example.o -L/home/nimish/HTMLProjects/WP2/lib/blas -lblas_LINUX    -L/home/nimish/HTMLProjects/WP2/lib/lapack -llapack_LINUX

得到错误:

/usr/bin/ld: cannot find -lblas_LINUX
collect2: ld returned 1 exit status

但是这些库确实存在-

nimish@ubuntu:~$ find /home/nimish/HTMLProjects/WP2 -name liblapack_LINUX.a
/home/nimish/HTMLProjects/WP2/lib/lapack/liblapack_LINUX.a

nimish@ubuntu:~$ find /home/nimish/HTMLProjects/WP2 -name libblas_LINUX.a
/home/nimish/HTMLProjects/WP2/lib/BLAS/libblas_LINUX.a

我在做什么错?我对这种链接库业务以及gcc还是陌生的.

What am i doing wrong? I am somewhat new to this linking libraries business as well as gcc.

推荐答案

首先，您需要确保已使用(+ lapack)

first you need to ensure you have BLAS installed using(+lapack)

sudo apt-get install libblas-dev liblapack-dev

sudo apt-get install libblas-dev liblapack-dev

然后您可以在程序文件后使用-lblas进行链接.或者您可以使用制作文件.

then you can link using -lblas after your program files. or you can use a make file.

从我的角度来看，我更喜欢使用OpenBlas，您可以在makefile中使用以下内容.

from my side I prefer to use OpenBlas instead, you can use the following in a makefile.

1. www.openblas.net ，获取tar.gz将其复制到您的目录中
2. 提取它:tar -zxvf OpenBLAS-0.2.20.tar.gz
3. 编译它:cd OpenBLAS-0.2.20做

1. www.openblas.net, get the tar.gz copy it in your directory
2. extract it : tar -zxvf OpenBLAS-0.2.20.tar.gz
3. compile it : cd OpenBLAS-0.2.20 make

完成后，您应该拥有文件libopenblas.a，即openblas库

When it is done you should have the file libopenblas.a, the openblas library

• BLASLIB = OpenBLAS/libopenblas.a -lpthread

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