使用不同的gcc版本从Rtools与Rcpp包括在Windows上 [英] Using a different gcc version from that included with Rtools with Rcpp on Windows

问题描述

在我开始更新gcc之前，有任何人实际尝试过，并且他们可以确认从源代码建立R是更新gcc版本，用于使用Rcpp编译c ++代码（即不一定用于包创作，当然不是为了CRAN有效包）？

Before I embark on updating gcc, has anyone actually attempted this, and can they confirm building R from source is required to update the gcc version one uses to compile c++ code with Rcpp (i.e. not necessarily for package authoring and certainly not for CRAN-valid packages)?

请参阅Dirk对此问题的回答以及原始海报的后续评论如何在Windows上使用gcc 4.8.1与Rcpp 。

See Dirk's answer to this question, and the follow-on comment from the original poster How to use gcc 4.8.1 with Rcpp on Windows.

推荐答案

不需要从源重建 R 。这里是我用于 Windows 7 x64 系统的步骤，运行 R 3.1.1 与 Rtools 3.1.0.1942 。此更新对 gcc 的影响尚未彻底测试：

Rebuilding R from source does not appear necessary. Here are the steps I used for a Windows 7 x64 system, running R 3.1.1 with Rtools 3.1.0.1942. The implications of this update to gcc have not been thoroughly tested:

1. 启动清除R会话和 remove.packages（Rcpp）和任何其他 Rcpp 相关。关闭R会话。


2. 从
   
3. 选择gcc版本4.8.1 / Arch x64 / Threads posix / Exception sjlj / Build rev 5并安装到[云端硬盘]：\Rtools \mingw-builds\ ...



4. 更新系统 PATH 条目（位于 PATH 顶部或其附近）： [驱动器]：\R\R-3.1.1\ bin \x64; [Drive]：\Rtools\bin; [Drive]：\Rtools \mingw-build\x64-4.8.1-posix-sjlj-rev5\mingw64\bin\;
第三个路径条目替换 Rtools 安装程序： [Drive]：\Rtools\gcc-4.6.3\bin

1. Start a clean R session and remove.packages("Rcpp") and anything else Rcpp related. Close R session.
2. Download and run MinGW-builds from Link to MinGW-builds installer.
3. Select gcc version 4.8.1/Arch x64/Threads posix/Exception sjlj /Build rev 5 and install to [Drive]:\Rtools\mingw-builds\ ...

4. Update the system PATH variable to include these entries in the following order (at or near the top of PATH): [Drive]:\R\R-3.1.1\bin\x64;[Drive]:\Rtools\bin;[Drive]:\Rtools\mingw-build\x64-4.8.1-posix-sjlj-rev5\mingw64\bin\; the 3rd path entry replaces the one included by the Rtools installer: [Drive]:\Rtools\gcc-4.6.3\bin

重新启动或以其他方式反映PATH

Restart, or otherwise, to reflect PATH changes.

使用 R 3.1.1（2014-07-10）与 Rcpp 0.11.2 。使用 rgui.exe 而不是通过诸如 RStudio 的I​​DE来执行此操作最简单，

These steps have been followed using R 3.1.1 (2014-07-10) with Rcpp 0.11.2. It is easiest to do this using rgui.exe, and not via an IDE such as RStudio, due to the silent loading of previous workspaces and packages of the latter.

通过运行 system（'gcc -v'）在 R 会话中获取：

Test set-up by running system('gcc -v') in a R session to obtain:

COLLECT_GCC=F:\Rtools\MINGW-~1\X64-48~1.1-P\mingw64\bin\gcc.exe
COLLECT_LTO_WRAPPER=f:/rtools/mingw-~1/x64-48~1.1-p/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/4.8.1/lto-wrapper.exe
Target: x86_64-w64-mingw32
[Edited Config info]
Thread model: posix
gcc version 4.8.1 (rev5, Built by MinGW-W64 project) 

要确认 编译器错误的存在， gcc 4.6.3到4.8.0 在 R中有一些新的 C ++ 11 特性 gcc 4.8。* / code>会话运行 Rcpp :: sourceCpp 下面的代码，保存为 .cpp 生成没有编译器警告或错误（而这将完全失败使用 gcc 4.6.3 ）：

To confirm a selection of compiler bugs present with gcc 4.6.3 to 4.8.0 are no more, as well as test some new C++11 features available with gcc 4.8.*, in a R session running Rcpp::sourceCpp on the following code, saved as .cpp file, should generate no compiler warnings or errors (whereas this will totally fail using gcc 4.6.3):

#include <Rcpp.h>

// [[Rcpp::plugins("cpp11")]]


template<typename T>
struct Wrap 
{
    int test2(int depth)
    {
        m_test++;
        std::vector<int> v = { 0, 1, 2, 3 };
        return depth == 0? 1 : std::accumulate(
             v.begin(), v.end(), int(0), [=](int sub, int const&) {
             return sub + test2(depth - 1);
             });   
    }

    int m_test = 0;
};


  struct X
{
  template <class T> static void bar() {}

  template <class T> void foo(T p) 
  {
    [&] { bar<T>(); };
  }
};

// [[Rcpp::export]]
double inheriting(int in_){

struct A { 
  A(int u){
    hello = u*u/2.0;
  }; 
double hello;
};

struct B: A { using A::A; };

  B b(in_);
  return(b.hello);
}

// [[Rcpp::export]]
void test_lambda(int in_)
{
  X x;
  x.foo(in_);
}

// [[Rcpp::export]]
int test_bug_4_7_2(int in_){

Wrap<int> w;
return w.test2(in_);
}

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