linux - Lapack 中链接错误 undefined reference to `dgels_'

Question

我按照以下网页在 linux 中安装 ATLAS + Lapack:

http://math-atlas.sourceforge.net/atlas_install/node6.html

bunzip2 -c atlas3.10.1.tar.bz2 | tar xfm -    # create SRCdir
mv ATLAS ATLAS3.10.1                          # get unique dir name
cd ATLAS3.10.1                                # enter SRCdir
mkdir Linux_C2D64SSE3                         # create BLDdir
cd Linux_C2D64SSE3                            # enter BLDdir
../configure -b 64 -D c -DPentiumCPS=2400 \   # configure command
  --prefix=/home/whaley/lib/atlas \           # install dir
  --with-netlib-lapack-tarfile=/home/whaley/dload/lapack-3.4.2.tgz
make build                                    # tune & build lib
make check                                    # sanity check correct answer
make ptcheck                                  # sanity check parallel
make time                                     # check if lib is fast
make install                                  # copy libs to install dir

在那之后，我尝试在 http://www.netlib.org/lapack/lapacke.html

示例代码:

#include <stdio.h>
#include <lapacke.h>

int main (int argc, const char * argv[])
{
   double a[5*3] = {1,2,3,4,5,1,3,5,2,4,1,4,2,5,3};
   double b[5*2] = {-10,12,14,16,18,-3,14,12,16,16};
   lapack_int info,m,n,lda,ldb,nrhs;
   int i,j;
   m = 5;
   n = 3;
   nrhs = 2;
   lda = 5;
   ldb = 5;

   info = LAPACKE_dgels(LAPACK_COL_MAJOR,'N',m,n,nrhs,a,lda,b,ldb);

   for(i=0;i<n;i++)
   {
      for(j=0;j<nrhs;j++)
      {
         printf("%lf ",b[i+ldb*j]);
      }
      printf("\n");
   }
   return(info);
}

我发现构建库没有 iblapacke.a ，所以我通过 myslef 构建这个库

cd lapack-3.4.2
cp make.inc.example make.inc
cd lapacke
make 

然后，我终于有了 iblapacke.a，所以我通过以下方式编译上面的示例:

g++ test3.cpp liblapacke.a -o test3.exe  

我收到以下错误:

liblapacke.a(lapacke_dgels_work.o): In function `LAPACKE_dgels_work':
lapacke_dgels_work.c:(.text+0x1dd): undefined reference to `dgels_'
lapacke_dgels_work.c:(.text+0x2b7): undefined reference to `dgels_'

在我谷歌之后，我发现: http://www.netlib.org/lapack/explore-html/d7/d3b/group__double_g_esolve.html

Functions/Subroutines 
subroutine  dgels (TRANS, M, N, NRHS, A, LDA, B, LDB, WORK, LWORK, INFO) 
  DGELS solves overdetermined or underdetermined systems for GE matrices 

有一个函数 dgels ，没有下划线，在

http://shtools.ipgp.fr/www/faq.html#l4

我认为加下划线是为了意外，

nm -A liblapacke.a |grep "dgels_"

liblapacke.a:lapacke_dgels.o:                 U LAPACKE_dgels_work
liblapacke.a:lapacke_dgels_work.o:                 U LAPACKE_dge_trans
liblapacke.a:lapacke_dgels_work.o:0000000000000000 T LAPACKE_dgels_work
liblapacke.a:lapacke_dgels_work.o:                 U LAPACKE_xerbla
liblapacke.a:lapacke_dgels_work.o:                 U dgels_
liblapacke.a:lapacke_dgels_work.o:                 U free
liblapacke.a:lapacke_dgels_work.o:                 U malloc

我认为我应该在构建 liblapack.a 时尽量避免像构建“dgels”而不是“dgels”这样的下划线，这意味着我应该改变构建 Lapack 和 ATLAS 的东西，只是不知道该怎么做....任何建议表示赞赏!!

更新:http://software.intel.com/sites/products/documentation/doclib/mkl_sa/11/mkl_lapack_examples/c_bindings.htm

不知道有没有关联，加了-Ddgels=dgels_，同样链接错误!!

Answer 1

见: http://icl.cs.utk.edu/lapack-forum/viewtopic.php?f=12&t=3336

例如:

gcc LinearEquation.c -Ilapack-3.5.0/lapacke/include/ -Llapack-3.5.0 -llapacke -llapack -lrefblas -lgfortran -o LinearEquation

lapacke > lapack > refblas 的顺序很重要...如果您不想使用双步 gcc gfortran，请使用 - lgfortran