-std=c++20

[evilfrog13]

hi im new to all this im on ubuntu 20.04 LTS and wen i try the command MAKE i get
g++: error: unrecognized command line option '-std=c++20'; did you mean 'std=c++2a'?
thx

[userdocs]

edit: you probably need to use gcc 10 anyway as that is the minimum required to build btop

I believe you have to use either specify this -std=c++2a with gcc 9 or earlier (the default in ubuntu focal) or use gcc 10

From google:

C++20 features are available since GCC 8.

To enable C++20 support, add the command-line parameter

-std=c++20

For G++ 9 and earlier use

-std=c++2a

Or, to enable GNU extensions in addition to C++20 features, add

-std=gnu++20

[evilfrog13]

im really new to this gcc 10 is installed wen i got that error and i don't know where to use those command you are mentioning the only solution that worked for me was doing this
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
and updating everything after

[nsh07]

@evilfrog13 if you have the g++-10 package installed from apt, you'll need to run make CXX=g++-10 instead of the usual make because the default C++ compiler on 20.04 is g++-9, which doesn't support the -std=c++20 option.
Adding PPAs is unnecessary since GCC 10 is in the Ubuntu repos

[anmac1789]

How to install gcc10 with Ubuntu 20.04 or how do we type the command -std=c++20 OR -std=c++2a

[evilfrog13]

i was off this project for a while and still dont know what i am doing will make some change when i canOn Oct 28, 2025, at 2:36 PM, anmac1789 ***@***.***> wrote: How to install gcc10 with Ubuntu 20.04 or how do we type the command -std=c++20 OR -std=c++2a —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you were mentioned.Message ID: ***@***.***>

[anmac1789]

im sorry I think you meant to quote my last reply but it got mixed in with your original message...