c – Rcpp – sourceCpp – 未定义的符号
作者：互联网
我正在使用Rcpp将自编C写入R.
我有3个以下的C文件
header.h
#include <Rcpp.h>
int x();
def.cpp
#include <Rcpp.h>
#include "header.h"
// [[Rcpp::export]]
int x()
{
return 0;
}
call.cpp
#include <Rcpp.h>
#include "header.h"
// [[Rcpp::export]]
int callx(){
return x();
}
编译成功后,我可以调用函数callx()以及来自R的x()
R> callx()
[1] 0
R> x()
[1] 0
但是当我尝试使用cppSource来源call.cpp时,我得到了这个错误
> Rcpp::sourceCpp('src/call.cpp')
Error in dyn.load("/tmp/RtmpNpOnpJ/sourceCpp-x86_64-pc-linux-gnu-0.12.16/sourcecpp_3a47f828d0d/sourceCpp_2.so") :
unable to load shared object '/tmp/RtmpNpOnpJ/sourceCpp-x86_64-pc-linux-gnu-0.12.16/sourcecpp_3a47f828d0d/sourceCpp_2.so':
/tmp/RtmpNpOnpJ/sourceCpp-x86_64-pc-linux-gnu
0.12.16/sourcecpp_3a47f828d0d/sourceCpp_2.so: undefined symbol: _Z1xv
为了编译,我使用R CMD INSTALL,其中包括以下步骤：
g++ -I/usr/share/R/include -DNDEBUG -I"/usr/lib/R/library/Rcpp/include" -fpic -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c RcppExports.cpp -o RcppExports.o
g++ -I/usr/share/R/include -DNDEBUG -I"/usr/lib/R/library/Rcpp/include" -fpic -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c call.cpp -o call.o
g++ -I/usr/share/R/include -DNDEBUG -I"/usr/lib/R/library/Rcpp/include" -fpic -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c def.cpp -o def.o
g++ -shared -L/usr/lib/R/lib -Wl,-Bsymbolic-functions -Wl,-z,relro -o linkingtest.so RcppExports.o call.o def.o -L/usr/lib/R/lib -lR
解决方法:
我真的不明白为什么有些人如此反对创建包.
这是一个快速复制和粘贴一个完整的输出屏幕,对应五个命令,给我准确的输入文件你想要的.
五个简单的步骤.
第一步：为Rcpp创建一个占位符包
edd@rob:/tmp/flappix$Rscript -e 'Rcpp::Rcpp.package.skeleton("stubborn")'
Creating directories ...
Creating DESCRIPTION ...
Creating NAMESPACE ...
Creating Read-and-delete-me ...
Saving functions and data ...
Making help files ...
Done.
Further steps are described in './stubborn/Read-and-delete-me'.
Adding Rcpp settings
>> added Imports: Rcpp
>> added LinkingTo: Rcpp
>> added useDynLib directive to NAMESPACE
>> added importFrom(Rcpp, evalCpp) directive to NAMESPACE
>> added example src file using Rcpp attributes
>> added Rd file for rcpp_hello_world
>> compiled Rcpp attributes
edd@rob:/tmp/flappix$
第二步：复制您确切的三个源文件
edd@rob:/tmp/flappix$cp -vax header.h def.cpp call.cpp stubborn/src/
'header.h' -> 'stubborn/src/header.h'
'def.cpp' -> 'stubborn/src/def.cpp'
'call.cpp' -> 'stubborn/src/call.cpp'
edd@rob:/tmp/flappix$
第三步：运行compileAttributes()来更新导出
edd@rob:/tmp/flappix$cd stubborn/
edd@rob:/tmp/flappix/stubborn$Rscript -e 'Rcpp::compileAttributes()'
edd@rob:/tmp/flappix$
第四步：构建包
edd@rob:/tmp/flappix/stubborn$R CMD build .
* checking for file ‘./DESCRIPTION’ ... OK
* preparing ‘stubborn’:
* checking DESCRIPTION meta-information ... OK
* cleaning src
* installing the package to process help pages
* saving partial Rd database
* cleaning src
* checking for LF line-endings in source and make files and shell scripts
* checking for empty or unneeded directories
* building ‘stubborn_1.0.tar.gz’
edd@rob:/tmp/flappix$
第五步：安装它
edd@rob:/tmp/flappix/stubborn$R CMD INSTALL stubborn_1.0.tar.gz
* installing to library ‘/usr/local/lib/R/site-library’
* installing *source* package ‘stubborn’ ...
** libs
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -Wno-misleading-indentation -Wno-unused -Wno-ignored-attributes -Wno-deprecated-declarations -marc
h=native -c RcppExports.cpp -o RcppExports.o
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -Wno-misleading-indentation -Wno-unused -Wno-ignored-attributes -Wno-deprecated-declarations -marc
h=native -c call.cpp -o call.o
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -Wno-misleading-indentation -Wno-unused -Wno-ignored-attributes -Wno-deprecated-declarations -marc
h=native -c def.cpp -o def.o
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -Wno-misleading-indentation -Wno-unused -Wno-ignored-attributes -Wno-deprecated-declarations -marc
h=native -c rcpp_hello_world.cpp -o rcpp_hello_world.o
ccache g++ -Wl,-S -shared -L/usr/lib/R/lib -Wl,-Bsymbolic-functions -Wl,-z,relro -o stubborn.so RcppExports.o call.o def.o rcpp_hello_world.o -L/usr/lib/R/lib -lR
installing to /usr/local/lib/R/site-library/stubborn/libs
** R
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (stubborn)
edd@rob:/tmp/flappix/stubborn$
它显然加载,因为它自动链接src /中的所有源文件.
标签：c,r,rcpp 来源： https://codeday.me/bug/20190929/1834113.html