在 Windows 机器上将 GSL 库链接到 RcppGSL [英] Linking GSL library to RcppGSL on Windows machine

问题描述

我尝试将 GSL 库链接到 RcppGSL 包.以下是我的测试函数:

I try to link the GSL library to the RcppGSL package. The following is my test function:

# colNorm.cpp
// [[Rcpp::depends(RcppGSL)]]
#include <RcppGSL.h>
#include <gsl/gsl_matrix.h>
#include <gsl/gsl_blas.h>

extern "C" SEXP colNorm(SEXP sM) {
    try {   
        RcppGSL::matrix<double> M = sM; // create gsl data structures from SEXP
        int k = M.ncol();
        Rcpp::NumericVector n(k); // to store results 

        for (int j = 0; j < k; j++) {
            RcppGSL::vector_view<double> colview = gsl_matrix_column (M, j);
            n[j] = gsl_blas_dnrm2(colview);
        }
        M.free() ;
        return n; // return vector  

    } catch( std::exception &ex ) {
    forward_exception_to_r( ex );

    } catch(...) { 
        ::Rf_error( "c++ exception (unknown reason)" ); 
    }
    return R_NilValue; // -Wall
}

如果以下命令没有抛出编译器错误，则 GSL 库已成功链接到 RcppGSL:

The GSL library is succesfully linked to the RcppGSL if the following command does not throw a compiler error:

sourceCpp("colNorm.cpp")

由于我使用的是 Windows 机器，所以我需要定义环境变量，以便 RcppGSL 知道 GSL 库所在的位置.

Since I am using Windows machine, I need to define environment variables such that RcppGSL knows where the GSL library is located.

我尝试编辑环境变量，但以下编译错误表明该包仍然无法找到 GSL 库:

I tried editing the environment variable, but the following compiler error shows that the package is still unable to find the GSL library:

g++ -m64 -I"C:/PROGRA~1/R/R-31~1.1/include" -DNDEBUG -I"C:/CodeLibrary/lib"/include     -               I"C:/PROGRA~1/R/R-31~1.1/library/Rcpp/include" -I"C:/PROGRA~1/R/R-31~1.1/library/RcppGSL/include"  -I"d:/RCompile/CRANpkg/extralibs64/local/include"     -O2 -Wall  -mtune=core2 -c colNorm.cpp -o colNorm.o
g++ -m64 -shared -s -static-libgcc -o sourceCpp_38624.dll tmp.def colNorm.o -LC:/CodeLibrary/lib/lib -lgsl -lgslcblas -LC:/PROGRA~1/R/R-31~1.1/bin/x64 -lRlapack -LC:/PROGRA~1/R/R-31~1.1/bin/x64 -lRblas -lgfortran -Ld:/RCompile/CRANpkg/extralibs64/local/lib/x64 -Ld:/RCompile/CRANpkg/extralibs64/local/lib -LC:/PROGRA~1/R/R-31~1.1/bin/x64 -lR
c:/program files/r/r-3.1.1/rtools/gcc-4.6.3/bin/../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lgsl
c:/program files/r/r-3.1.1/rtools/gcc-4.6.3/bin/../lib/gcc/i686-w64-mingw32/4.6.3/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lgslcblas
collect2: ld returned 1 exit status

我设置了一个环境变量 LIB_GSL 等于 "C:/CodeLibrary/lib".在第一行，编译器获取我的环境变量并添加 /include.在第二行中，编译器添加了 /lib.我的C盘上不存在这些位置，也许这​​就是它找不到库的原因.

I set an environment variable LIB_GSL equal to "C:/CodeLibrary/lib". In the first line, the compiler takes my environment variable and adds /include. In the second line, the compiler adds /lib. Those locations do not exist on my C drive, maybe that's the reason why it cannot find the library.

如果有很多编译器经验的人可以展示如何成功地将第 3 方库链接到 Windows 机器上的包，我会非常高兴.

I would be really happy, if someone with a lot of compiler experience could show how to successfully link a 3rd party library to a package on Windows machine.

也许需要定义更多的环境变量?

Maybe more environment variables need to be defined?

推荐答案

感谢 Dirk 的支持！我终于启动并运行了.

Thanks Dirk for your handholding! I got it finally up and running.

必须做的三件事:

1) 下载 local300 文件夹从您的链接和分配驱动器上的文件夹.路径不能包含任何空格，即 C:/Program Files/local300 将不起作用但C:/local300 会工作

1) Download the local300 folder from your link and allocate folder on your drive. The path cannot contain any whitespaces, i.e. C:/Program Files/local300 will not work but C:/local300 will work

2) 设置环境变量 LIB_GSL 等于这个路径，例如LIB_GSL 到 C:/local300

2) Set the environment variable LIB_GSL equal to this path, e.g. LIB_GSL to C:/local300

3) 编译器查看 LIB_GSL/lib 的 libgsl.a 和 libgslcblas.a(-lgsl 和 -lgslcblas).但是，在 LIB_GSL/lib 中有子文件夹 i386 和 x64.我不知道如何更改编译器查找文件的位置，因此我从 x64 内部复制了所有内容并将其放入 LIB_GSL/lib 文件夹(一个文件夹级别以上).

3) The compiler looks at LIB_GSL/lib for libgsl.a and libgslcblas.a (-lgsl and -lgslcblas). However, in LIB_GSL/lib are subfolders i386 and x64. I didn't know how to change the place the compiler looks for the files, thus I copied everything from inside x64 and put it into LIB_GSL/lib folder (one folder level above).

这允许 RcppGSL 编译代码而不会出错.

This allows RcppGSL to compile code without errors.

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