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Can g++ (gcc) 11 be used on Debian Bullseye?

Can g++ (gcc) 11.1 be used on Debian Bullseye?

Debian 11 (bullseye) is soon to be released, and I am interested in a compiler with C++20 and modules support.

Debian 11 currently has gcc 10.2 and clang 11. clang 11 has some C++20 support.

Is Debian more conservative with gcc as opposed to clang because the OS uses gcc?

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3

Answers


  1. 0

    Since the links in the next paragraph are obsolete because Ubuntu 19.04 has reached its end of life, I refer readers of this answer to the more general case which is applicable for all users of gcc in Debian-based operating systems. For more information on installing non-standard versions of gcc and g++ in Debian-based operating systems please refer to this answer.

    Here it is, g++-11 from the default Ubuntu repositories ready to install in Debian Bullseye and the package’s dependencies are listed on this page.

    Open the terminal and type:

    cd ~/Desktop/
wget http://security.ubuntu.com/ubuntu/pool/universe/g/gcc-11/g++-11_11.1.0-1ubuntu1~21.04_amd64.deb
apt install --simulate ./g++-11_11.1.0-1ubuntu1~21.04_amd64.deb

    The last command will return a list of missing dependencies which can be found at this webpage. After all the missing dependency packages have been manually downloaded and installed, the command to install the g++-11 package is as follows:

    sudo apt install ./g++-11_11.1.0-1ubuntu1~21.04_amd64.deb

    The apt install --simulate commands will certainly generate unmet dependencies errors at first because the Debian Bullseye default repositories do not contain the gcc-11 dependency package (gcc-10 is the latest version), but they will show a list of missing dependency packages. If you work at it iteratively you will be able to get all of these missing dependency packages installed, so that in the end sudo apt install ./g++-11_11.1.0-1ubuntu1~21.04_amd64.deb will run without errors.

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  2. 0

    g++-11, gcc-11 installs OK into ‘Debian 11 Bullseye’.

    g++-11 and dependencies …

    cpp-11_11.1.0-4_amd64.deb
g++-11_11.1.0-4_amd64.deb
gcc-11_11.1.0-4_amd64.deb
gcc-11-base_11.1.0-4_amd64.deb
libasan6_11.1.0-4_amd64.deb
libatomic1_11.1.0-4_amd64.deb
libcc1-0_11.1.0-4_amd64.deb
libgcc-11-dev_11.1.0-4_amd64.deb
libgcc-s1_11.1.0-4_amd64.deb
libgomp1_11.1.0-4_amd64.deb
libitm1_11.1.0-4_amd64.deb
liblsan0_11.1.0-4_amd64.deb
libquadmath0_11.1.0-4_amd64.deb
libstdc++-11-dev_11.1.0-4_amd64.deb
libstdc++6_11.1.0-4_amd64.deb
libtsan0_11.1.0-4_amd64.deb
libubsan1_11.1.0-4_amd64.deb

    g++-11 https://packages.debian.org/experimental/g++-11

    Install : cd Downloads/ ; # apt install ./*

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  3. 0

    That matters with your "Source.list".

    if your "source.list" is the "Debian 11: Official sources.list":

    (Debian 11 source with g++(gcc)10)

    deb http://deb.debian.org/debian/ bullseye main
deb-src http://deb.debian.org/debian/ bullseye main
deb http://security.debian.org/debian-security bullseye-security main contrib
deb-src http://security.debian.org/debian-security bullseye-security main contrib
deb http://deb.debian.org/debian/ bullseye-updates main contrib
deb-src http://deb.debian.org/debian/ bullseye-updates main contrib

    then "apt-cache madison gcc":

    gcc | 4:10.2.1-1 | http://deb.debian.org/debian bullseye/main amd64 Packages

gcc-defaults |      1.190 | http://deb.debian.org/debian bullseye/main Sources

    If your "Source.list" is just like:

    (Debian 11 source with g++(gcc)11)

    deb http://mirrors.xmission.com/debian/ testing main non-free contrib

deb http://http.us.debian.org/debian testing main contrib non-free

deb http://ftp.us.debian.org/debian testing main non-free contrib

    then "apt-cache madison gcc":

    gcc | 4:11.2.0-2 | http://mirrors.xmission.com/debian testing/main amd64 Packages

gcc | 4:11.2.0-2 | http://http.us.debian.org/debian testing/main amd64 Packages

gcc | 4:11.2.0-2 | http://ftp.us.debian.org/debian testing/main amd64 Packages

    So, if you want to change your Debian 11‘s GCC from 10 to 11,

    you could change that to your Debian "source.list".

    Just do this below:

    cd /etc/apt/ && sudo nano sources.list

    And then change "source.list" with adding that source which can help you download the g++(gcc)11. please use the below to replace your Debian source or that offical sources:

    deb http://mirrors.xmission.com/debian/ testing main non-free contrib
deb http://http.us.debian.org/debian testing main contrib non-free
deb http://ftp.us.debian.org/debian testing main non-free contrib
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