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I am using a g++ 4.7 on Ubuntu 12.04 to compile my c++ code, and it won't be compiled unless an -std=gnu++11 option is added to my command like this:

g++ -std=gnu++11 main.cpp

Is there a way to add this option permanently to the compiler, because my text editor uses g++ to automatically compile my code and it won't work because I have to add this option and I can't add it like I can normally do inside of the terminal?

I've seen that people use some spec file to configure g++, but I don't understand how to do it, so the help from you guys will be appreciated.

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Spec file? That might be make with a makefile. A makefile is a horribly convoluted thing that I won't pretend to understand, though some people do, somehow. –  Bob Jul 16 '12 at 11:37
    
@Bob: A Makefile is a rather simple thing that is easy to understand once you get the idea of it being functional, not procedural. It's also mighty helpful in any kind of development. I wrote a tutorial about it which might be helpful for you... –  DevSolar Jul 16 '12 at 11:43
    
@DevSolar Yea, I was kinda joking there. Personally, I've never had a reason to learn about them (IDEs! :D), but the people who bother can probably pick it up quite quickly. –  Bob Jul 16 '12 at 11:46
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Note that spec file and Makefile are almost completely unrelated things: while the former is a compiler configuration file usually shipped with your compiler, the latter is a build instruction file shipped with your project. For the latter, export CXXFLAGS=-std=gnu++11 would usually suffice, but that's not the question at hand I believe. –  MvG Jul 16 '12 at 13:02

1 Answer 1

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I would simply create a shell script ~/bin/g++ containing the lines

#!/bin/sh
exec /usr/bin/g++ -std=gnu++11 "$@"

and ensure that ~/bin is on the PATH, and listed there before any other directory which contains a g++ executable (usually thats's /usr/bin). Editing the spec files is possible, but for your settings to become default, I believe you'd have to change the default specs, which means it will require root access and severe tinkering with the gcc internals. There is a good chance that this tinkering would be undone by the next upgrade of g++.

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This also requires that ~/bin first in $PATH, at least before the directory where the real g++ lives. I'd suggest alias g++='g++ --std=gnu++11' instead. –  ott-- Jul 16 '12 at 12:51
    
@ott, alias is all right for interactive command line use, but usually won't affect a command invoked by some editor, as OP requires. –  MvG Jul 16 '12 at 13:00
    
Ok, from within an editor the script is the right way. –  ott-- Jul 16 '12 at 13:38
    
As @ott correctly pointed out, your dir has to come before the established ones. Edited the question. Also note that the ~ in my answer refers to your home directory, so you should write export PATH=${HOME}/bin:${PATH}. Putting personal stuff in /bin is a bad idea, and should have required root access which my answer claims to be unneccessary. –  MvG Jul 16 '12 at 14:19

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