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Home/ Questions/Learn how to fix error: cc1plus: error: unrecognized command line option "-std=c++11"
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Alaia Gelbero
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Alaia Gelbero
Asked: May 18, 20222022-05-18T21:11:57+00:00 2022-05-18T21:11:57+00:00In: cpp

Learn how to fix error: cc1plus: error: unrecognized command line option “-std=c++11”

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I’m trying to run a new project. I do a couple of things like this:

g++ (GCC) 4.1.2 20080704 (Red Hat 4.1.2-54)
 Copyright (C) 2006 Free Software Foundation, Inc.
 This is free software; see the source for copying conditions. There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

But in my program, I am getting the warning:

cc1plus: error: unrecognized command line option "-std=c++11"

Can someone explain why the “ cc1plus: error: unrecognized command line option “-std=c++11″” issue happened? Where have I gone wrong? Thank you!

unrecognized command line option -std=c++11
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    hdtutoria Expert
    2022-06-22T10:48:56+00:00Added an answer on June 22, 2022 at 10:48 am

    The cause: This error happens because you didn’t update your G++ version. C++11 has only been available since G++ 4.3. 

    Solution: You need to update it to 4.7 – which is the most recent version. You’ll have to use -std=c++0x in versions pre-G++ 4.7 and for more recent versions you can use -std=c++11.

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  2. Léna Foucher
    2022-05-25T21:15:42+00:00Added an answer on May 25, 2022 at 9:15 pm

    Quoting from gcc webpage

    C++11 features are available as part of the “mainline” GCC compiler in the trunk of GCC’s Subversion repository and in GCC 4.3 and later. To enable C++0x support, add the command-line parameter -std=c++0x to your g++ command line. Or, to enable GNU extensions in addition to C++0x extensions, add -std=gnu++0x to your g++ command line. GCC 4.7 and later support -std=c++11 and -std=gnu++11 as well.

    You probably use a version g++ that doesn’t support -std=c++11. -std=c++0x is a better alternative.

    Only versions greater than 4.3 are eligible for C++11 features.

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