Install or upgrade GCC 4.8 under Linux to support C++11 standards

The C++11 standard was unanimously adopted in August 2011, the first major revision of the C + + language since 1998, and the improvement and expansion of the C + + language. Subsequently, each compiler manufacturer implements or partially implements the features in C + +.

To see how much support the compiler has for c++11, see the article:

This article mainly describes how to upgrade GCC to support c++11 under Linux systems. For now, GCC is the most supported compiler for C++11, but it requires GCC4.8 and more versions.

This article uses the operating system: Centos 6.4 desktop,64bit;

Original GCC version: 4.4.7;

Objective: To upgrade GCC to 4.8.2 to support c++11.

Get gcc 4.8.2 package: wget http://gcc.skazkaforyou.com/releases/gcc-4.8.2/gcc-4.8.2.tar.gz;

Decompression: TAR-XF gcc-4.8.2.tar.gz;

Go to directory gcc-4.8.2, run:./contrib/download_prerequisites. This magical script file will help us download, configure, and install dependent libraries, which can save us a lot of time and effort.

Create the output directory and into the directory: mkdir GCC-BUILD-4.8.2;CD gcc-build-4.8.2;

.. /configure--enable-checking=release--enable-languages=c,c++--disable-multilib. --enable-languages says you want your GCC to support those languages,--disable-multilib does not generate a cross compiler that compiles to other platform executable code. The compiler generated by--disable-checking does not perform additional checks during compilation, or it can use--enable-checking=xxx to add some checks;

Compile: Make; note that this step and the previous step, more time-consuming;

Installation: make install;

Validation: Gcc-v or g++-V, if the version of GCC that is displayed is still a previous version, you will need to reboot the system, or you can view the installation location of GCC: which GCC; and then in view version/usr/local/bin/gcc-v, where GCC is usually installed, if shown as;

Indicates that the upgrade has been successful.

Verify that it works properly, taking the new Std::array added to the c++11 as an example.

Vim Stdarray.cpp;

Enter C + + code:

#include <iostream>
#include <string>
#include <iterator>
#include <algorithm>
#include <array>
     
int main ()
{
    //Construction uses aggregate initialization
    Std::array <int, 3> a1{{1,2,3}};  Double-braces required
    std::array<int, 3> a2 = {1, 2, 3};//except after =
    std::array<std::string, 2> a3 = {{std::string ("a"), "B"}};
     
    Container operations are supported
    Std::sort (A1.begin (), A1.end ());
    Std::reverse_copy (A2.begin (), A2.end (), 
                      std::ostream_iterator<int> (Std::cout, ""));
     
    Std::cout << ' \ n ';
     
    Ranged for loop are supported for
    (auto& s:a3)
        std::cout << s << ";
    Std::cout << ' \ n ';    
}

Compiling: g++ -std=c++11 -o stdarray stdarray.cpp, be sure to add c++11, or you may not compile or run.

Run:./stdarray;

Result output:

Indicates that the upgraded GCC can indeed support c++11 development.

Author: cnblogs Lizhenghn

More Wonderful content: http://www.bianceng.cnhttp://www.bianceng.cn/Programming/cplus/