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

Question

I'm trying to compile using g++ and either the -std=c++11 or c++0x flags.

However, I get this error

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

g++ --version

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.

@stefan Incorrect, both are possible. Which gnu version are you using? C++11 is only supported in >= 4.3. — antonijn, Feb 03 '13 at 16:27
@Antonijn, Yes, it was. I misunderstood your comment, sorry. I thought you meant the option was for 4.3+. — chris, Feb 03 '13 at 16:31
What do the sysadmins *mean* when they say C++11 has been installed? — Carl Norum, Feb 03 '13 at 16:33
That's horribly old. That version does not support C++11. Install a later version like 4.7 for C++11 support. — Konfle Dolex, Feb 03 '13 at 16:33
It is possible the sysadmins *did* install a C++11 capable compiler, but did not make it the default one. You can check which specific versions of GCC are installed by trying to auto-complete the command `g++-` in you console window. — Bart van Ingen Schenau, Feb 03 '13 at 16:42
@stefan My g++ version is **g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3** but still get the error, how to fix it. — twlkyao, Jan 09 '14 at 13:24
GCC 4.1 is still available due to PowerMacs. Apple ships OS X 10.5 with GCC 4.1. I still use my old PowerMac for testing ancient the hardware and software. If you really want to punish yourself, then install Fedora 1 on a VM with GCC 3.1. — jww, Jan 25 '19 at 02:29

antonijn · Accepted Answer · 2013-02-03T21:16:04.850

107

Seeing from your G++ version, you need to update it badly. C++11 has only been available since G++ 4.3. The most recent version is 4.7.

In versions pre-G++ 4.7, you'll have to use -std=c++0x, for more recent versions you can use -std=c++11.

edited Feb 03 '13 at 21:16

answered Feb 03 '13 at 16:33

antonijn

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Is 4.8.0 like good to go, or is there an actual release in March or something? – chris Feb 03 '13 at 16:36
@chris I'm sorry, it should be 4.7, 4.8 is still in-development. – antonijn Feb 03 '13 at 16:37
@Antonijn, Ah, guess I'll wait a month or two. I prefer the stable releases, or whatever better word for it you want to use. – chris Feb 03 '13 at 16:39
@chris Yeah. Or you just wait for the linux mint update manager to inform you :) – antonijn Feb 03 '13 at 16:40
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@JoeCoderGuy Yep, that's the one I'm using. – antonijn Feb 03 '13 at 16:44
Same here. I'm using 4.7.2. – chris Feb 03 '13 at 16:55

score 14 · Answer 2 · answered Feb 03 '13 at 16:30

14

Quoting from the gcc website:

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.

So probably you use a version of g++ which doesn't support -std=c++11. Try -std=c++0x instead.

Availability of C++11 features is for versions >= 4.3 only.

answered Feb 03 '13 at 16:30

stefan

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@Antonijn Correct, but not an option for everyone. – stefan Feb 03 '13 at 16:32
@Antonijn: There is software which is incompatible with versions > 4.1. E.g. ABACUS http://www.informatik.uni-koeln.de/abacus/index.html Sadly enough I had to use it once. – stefan Feb 03 '13 at 16:35

score 3 · Answer 3 · edited Feb 20 '14 at 17:04

3

you should try this

g++-4.4 -std=c++0x or g++-4.7 -std=c++0x

edited Feb 20 '14 at 17:04

codegeek

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answered Feb 20 '14 at 16:46

papo

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score -4 · Answer 4 · answered May 05 '15 at 06:52

-4

I also got same error, compiling with -D flag fixed it, Try this:

g++ -Dstd=c++11

answered May 05 '15 at 06:52

pankaj kushwaha

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Why is this downvoted? What's wrong with the answer? Why doesn't this work? – Veda Nov 24 '16 at 12:32
@Veda for me at least (on gcc4.6.3), it definitely was not compiling with c++11. I wrote a simple 2 line program with `std::vector v = {1, 2, 3};` to test and it was throwing all sorts of errors over it (different errors than without the flag though, interestingly enough). – scohe001 Jan 23 '18 at 22:05
8

@Veda while this answer will compile, it very likely doesn't do anything desirable. The `-D` command line argument is equivalent to inserting a `#define` in your source code. So this command is like having `#define std c++11`. Can you then imagine how `std::string` will be redefined to `c++11::string`? Not very useful at all. – jwm Mar 13 '18 at 17:43

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

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