我该如何修复这个 C 代码/BLAS 错误？

发布于 2024-10-31 00:07:07 字数 542 浏览 5 评论 0原文

我正在尝试编写使用 R 中的 BLAS lib 的 ac 函数（稍后将在 R 脚本中使用）

#include <stdio.h>
#include <R.h>
#include <R_ext/BLAS.h>

void foo(int *dimension, double *vect1, double *vect2)
{
    const int dim = dimension[0];
    const int incxy = 1;

    //swaps two vectors
    F77_NAME(dswap)(&dim,vect1,&incxy,vect2,&incxy);
}

我使用以下命令编译代码：

R CMD SHLIB foo.c

我收到错误：

foo.o:foo.c:(.text+0x41): undefined reference to `dswap_'

我缺少什么？

原文

I'm trying to write a c function(that later will be used in R scripts) that uses BLAS lib from R

#include <stdio.h>
#include <R.h>
#include <R_ext/BLAS.h>

void foo(int *dimension, double *vect1, double *vect2)
{
    const int dim = dimension[0];
    const int incxy = 1;

    //swaps two vectors
    F77_NAME(dswap)(&dim,vect1,&incxy,vect2,&incxy);
}

I compile the code using :

R CMD SHLIB foo.c

I get the error :

foo.o:foo.c:(.text+0x41): undefined reference to `dswap_'

What am i missing ?

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野心澎湃 2024-11-07 00:07:07

包含头文件与链接库不同。

我实际上对 R 一无所知，但我做了一些搜索并发现 http://cran.r-project.org/doc/manuals/R-exts.html#Creating-shared-objects 这表明您需要 BLAS_LIBS 变量 - 如果您不需要使用 makefile 看起来您只需获取命令“R CMD config BLAS_LIBS”的输出，然后将输出包含在命令行中。您也许也可以将其添加到 PKG_LIBS 变量中，但我对 R 的了解还不够确定。

编辑：

已将文件 Makevars.win 设置为包含

PKG_LIBS=$(BLAS_LIBS) 
PKG_LIBS=$(LAPAK_LIBS)

将 PKG_LIBS 变量替换为 LAPAK_LIBS。尝试使用 += 而不是 =。

Including a header file is not the same as linking a library.

I don't actually know anything about R, but I did some searching and found http://cran.r-project.org/doc/manuals/R-exts.html#Creating-shared-objects which indicates you need the BLAS_LIBS variable - if you're not using a makefile it looks like you can just get the output of the command "R CMD config BLAS_LIBS" and then include the output on the command line. You might also be able to just add it to the PKG_LIBS variable, but I don't know enough about R to be sure.

EDIT:

have set file Makevars.win to include

PKG_LIBS=$(BLAS_LIBS) 
PKG_LIBS=$(LAPAK_LIBS)

That replaces the PKG_LIBS variable with LAPAK_LIBS. Try it with += instead of =.

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夜巴黎 2024-11-07 00:07:07

已设置文件
Makevars.win 包含

PKG_LIBS=$(BLAS_LIBS) 
PKG_LIBS=$(LAPAK_LIBS)

但错误仍然存在。

BINGO ：添加到

"R CMD SHLIB foo.c"

的输出

"R CMD config BLAS_LIBS"

"R CMD SHLIB foo.c -LC:/PROGRA~1/R/R-212~1.2/bin/i386 -lRblas"

中，现在它可以工作了。

have set file
Makevars.win to include

PKG_LIBS=$(BLAS_LIBS) 
PKG_LIBS=$(LAPAK_LIBS)

but error persists.

BINGO : added to

"R CMD SHLIB foo.c"

the output from

"R CMD config BLAS_LIBS"

as in

"R CMD SHLIB foo.c -LC:/PROGRA~1/R/R-212~1.2/bin/i386 -lRblas"

and now it works.

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从此见与不见 2024-11-07 00:07:07

它需要链接到提供 dswap 功能的任何内容。我猜那是在 R 库中。

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流星番茄 2024-11-07 00:07:07

它在这里工作（请忽略我的 ~/.R/Makevars 选择特定的 CC 和 CFLAGS；并忽略较小的空白编辑）：

edd@max:/tmp$ R CMD SHLIB foo.c
gcc-4.5 -I/usr/share/R/include -fpic -O3 -g0 -Wall -pipe -pedantic -std=gnu99 \
        -c foo.c -o foo.o
gcc -shared -o foo.so foo.o -L/usr/lib64/R/lib -lR
edd@max:/tmp$ cat foo.c
#include <stdio.h>
#include <R.h>
#include <R_ext/BLAS.h>

void foo(int *dimension, double *vect1, double *vect2)
{
    const int dim = dimension[0];
    const int incxy = 1;

    //swaps two vectors
    F77_NAME(dswap)(&dim,vect1,&incxy,vect2,&incxy);
}
edd@max:/tmp$

Ubuntu 10.10，R、gcc 等的库存包。也许您的 R 是在本地构建的静态库配置中？

It works here (and please ignore that my ~/.R/Makevars selects a particular CC and CFLAGS; and also ignore minor whitespace edits):

edd@max:/tmp$ R CMD SHLIB foo.c
gcc-4.5 -I/usr/share/R/include -fpic -O3 -g0 -Wall -pipe -pedantic -std=gnu99 \
        -c foo.c -o foo.o
gcc -shared -o foo.so foo.o -L/usr/lib64/R/lib -lR
edd@max:/tmp$ cat foo.c
#include <stdio.h>
#include <R.h>
#include <R_ext/BLAS.h>

void foo(int *dimension, double *vect1, double *vect2)
{
    const int dim = dimension[0];
    const int incxy = 1;

    //swaps two vectors
    F77_NAME(dswap)(&dim,vect1,&incxy,vect2,&incxy);
}
edd@max:/tmp$

Ubuntu 10.10, stock packages for R, gcc etc. Maybe your R is locally built in a static library configuration?

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