当从终端而不是rstudio-server运行R时，使用RcppArmadillo的代码会进行编译

Question

我正在尝试使用sourceCpp和RcppArmadillo编译一些c++代码。我在Ubuntu上使用的是R 3.3.3，Rcpp是0.12.10，RcppArmadillo是0.7.800.2.0。文件armatest.cpp被完全剥离。

// [[Rcpp::depends(RcppArmadillo)]]
#include <RcppArmadillo.h>

using namespace arma; 
using namespace Rcpp;

int one() {
  return 1;
}

当我试图在Rstudio服务器中编译这个代码时，我得到了以下编译错误：

> Rcpp::sourceCpp("armatest.cpp", verbose = TRUE, rebuild=TRUE)

Generated extern "C" functions 
--------------------------------------------------------


#include <Rcpp.h>

Generated R functions 
-------------------------------------------------------

`.sourceCpp_1_DLLInfo` <- dyn.load('/tmp/Rtmp3oSZra/sourceCpp-x86_64-pc-linux-gnu-0.12.10/sourcecpp_47d41ae4918/sourceCpp_10.so')


rm(`.sourceCpp_1_DLLInfo`)

Building shared library
--------------------------------------------------------

DIR: /tmp/Rtmp3oSZra/sourceCpp-x86_64-pc-linux-gnu-0.12.10/sourcecpp_47d41ae4918

/usr/lib/R/bin/R CMD SHLIB -o 'sourceCpp_10.so' --preclean  'armatest.cpp'  
g++ -I/usr/share/R/include -DNDEBUG    -I"/home/amercer/R/x86_64-pc-linux-gnu-library/3.3/Rcpp/include" -I"/home/amercer/R/x86_64-pc-linux-gnu-library/3.3/RcppArmadillo/include" -I"/home/amercer"   -fpic  -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -g  -c armatest.cpp -o armatest.o
g++ -shared -L/usr/lib/R/lib -Wl,-z,relro -o sourceCpp_10.so armatest.o -llapack -lblas -lgfortran -lm -lquadmath -L/usr/lib/R/lib -lR
/usr/share/R/share/make/shlib.mk:6: recipe for target 'sourceCpp_10.so' failed
Error in Rcpp::sourceCpp("armatest.cpp", verbose = TRUE, rebuild = TRUE) : 
  Error 1 occurred building shared library.

但是，当我从命令行(Rstudio-server之外)运行R并重试时，它编译得很好。

>Rcpp::sourceCpp("armatest.cpp", verbose = TRUE, rebuild=TRUE)

Generated extern "C" functions
--------------------------------------------------------


#include <Rcpp.h>

Generated R functions
-------------------------------------------------------

`.sourceCpp_1_DLLInfo` <- dyn.load('/tmp/RtmptRileh/sourceCpp-x86_64-pc-linux-gnu-0.12.10/sourcecpp_1966315b9edd0/sourceCpp_4.so')


rm(`.sourceCpp_1_DLLInfo`)

Building shared library
--------------------------------------------------------

DIR: /tmp/RtmptRileh/sourceCpp-x86_64-pc-linux-gnu-0.12.10/sourcecpp_1966315b9edd0

/usr/lib/R/bin/R CMD SHLIB -o 'sourceCpp_4.so' --preclean  'armatest.cpp'
g++ -I/usr/share/R/include -DNDEBUG    -I"/home/amercer/R/x86_64-pc-linux-gnu-library/3.3/Rcpp/include" -I"/home/amercer/R/x86_64-pc-linux-gnu-library/3.3/RcppArmadillo/include" -I"/home/amercer"   -fpic  -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -g  -c armatest.cpp -o armatest.o
g++ -shared -L/usr/lib/R/lib -Wl,-z,relro -o sourceCpp_4.so armatest.o -llapack -lblas -lgfortran -lm -lquadmath -L/usr/lib/R/lib -lR
Warning message:
In Rcpp::sourceCpp("armatest.cpp", verbose = TRUE, rebuild = TRUE) :
  No Rcpp::export attributes or RCPP_MODULE declarations found in source

据我所知，它们使用相同的标志执行完全相同的命令。如何解释这种差异？Rcpp本身在Rstudio-server中对我来说工作得很好，所以它是关于RcppAarmadillo的。

Answer 1

可能是您的设置的本地设置，因为它在这里工作得很好，也来自RStudio-但请注意，我确实添加了一个// [[Rcpp::export]]以及一个自动执行的示例：

> Rcpp::sourceCpp("/tmp/armaQ.cpp")

> one()
[1] 1
> 

您的示例，经过最小程度的修改：

// [[Rcpp::depends(RcppArmadillo)]]
#include <RcppArmadillo.h>

using namespace arma; 
using namespace Rcpp;

// [[Rcpp::export]]
int one() {
  return 1;
}

/*** R
one()
*/