试图用Rcpp编译c ++ 11时的g ++错误 [英] g++ errors when trying to compile c++11 with Rcpp

问题描述

系统规格：

• 操作系统 - Mac OS X 10.6.8 （Snow Leopard）


• g ++ - Macports gcc 4.8.1_2 + universal


• - 2.15.3


• Rcpp - 0.10.3

• OS - Mac OS X 10.6.8 (Snow Leopard)
• g++ - Macports gcc 4.8.1_2+universal
• R - 2.15.3
• Rcpp - 0.10.3

我一直收到一个错误，当我试图编译使用C ++ 11在R（通过Rcpp）的函数 - 由于某种原因，g ++不认识 -std = c ++ 11 选项。

I keep on receiving an error when I am trying to compile functions that use C++11 in R (through Rcpp) - for some reason, g++ does not recognise -std=c++11 option.

此示例取自Rcpp帮助文件（它不包含任何特定于C ++ 11的，但可以显示我的问题） 。如果我尝试运行：

This example is taken from Rcpp help files (it does not contain anything specific to C++11, but can show what my problem is). If I try running:

require( Rcpp )
Sys.setenv( "PKG_CXXFLAGS"="-std=c++11" )
cppFunction(plugins=c("cpp11"), '
int useCpp11() {
    int x = 10;
    return x;
}')

我得到：

cc1plus: error: unrecognized command line option "-std=c++11"
make: *** [file61239328ae6.o] Error 1
g++ -arch x86_64 -I/Library/Frameworks/R.framework/Resources/include -I/Library/Frameworks/R.framework/Resources/include/x86_64 -DNDEBUG  -I/usr/local/include  -I"/Library/Frameworks/R.framework/Versions/2.15/Resources/library/Rcpp/include"   -std=c++11  -fPIC  -g -O2  -c file61239328ae6.cpp -o file61239328ae6.o 
Error in sourceCpp(code = code, env = env, rebuild = rebuild, showOutput = showOutput,  : 
  Error 1 occurred building shared library.

同时，我可以直接从bash编译这个函数 - 如果这个代码在 useCpp11.cpp 文件，那么这个运行没有任何投诉：

At the same time, I can compile this function directly from bash - if this code is in useCpp11.cpp file, then this runs without any complaints:

g++ useCpp11.cpp -std=c++11

当然，我做错了，但我不能解决它是什么。 gcc 4.8被设置为bash中的默认编译器，Rcpp过去一直没有故障工作。我怀疑我不告诉R哪个版本的g ++使用 - 可能是这种情况？

Certainly, I am doing something wrong, but I cannot work out what it is. gcc 4.8 is set as a default compiler in bash, Rcpp has been working without fault in the past. I suspect that I am not telling R which version of g++ to use - could that be the case?

推荐答案

Kevin Ushley绝对右键 - 确保使用正确编译器的最简单方法是通过 Makevars 文件。在我的例子中，我添加了：

Kevin Ushley is absolutely right - the easiest way to make sure that the right compiler is being used is through Makevars file. In my case, I added:

CXX = g++-4.8.1
PKG_CXXFLAGS = -std=c++11

这是我一直遗漏的 - 如果您正在编译您的包，这个工作。

This is what I have been missing - and it all worked afterwards. This works if you are compiling your package.

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