gcc – How to Install gfortran-7

gcc

I have successfully installed gcc-7 with

sudo sed -i 's/xenial/zesty/g' /etc/sources.list.d/ubuntu-toolchain-r*.list
sudo apt update && sudo apt full-upgrade

Howver this does not install gfortran. I need gfortran-7 for my work.
Installing gfortran from gcc source, which provides for specifying languages to be installed gives an error (sfp-exceptions.c) at the make stage.
Does anyone know how I can have gfortran-7 installed.
I am working on ubuntu 16.04
Hello again, my apologies to those who have spent time looking at my problem. I managed to install gfortran-7 with

sudo apt-get install gfortran

Previously it did not work. Perhaps because of gcc-7, gofrtran-7 has installed. I am now trying to figure out how to make gfortran-7 the default, currently –version shows gfortran-5.
Thank you all
Perhaps someone can assist me make gfortran-7 as the alternative to gfortran-5. I have been able to make gcc-7 as the alternative with

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 60 --slave /usr/bin/g++ g++ /usr/bin/g++-5
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 40 --slave /usr/bin/g++ g++ /usr/bin/g++-7

then

sudo update-alternatives --config g++

I have tried to modify the above commands for gfortran, without success, even with reference to
man

man update-alternatives

update-alternatives --help

Please help

Best Answer

I use aptitude on the command line for everything in ubuntu. I always install the toolchain test builds so I can get all versions of gfortran (I have to support down to 4.9). Here's how I get them on a new install of ubuntu:

sudo apt-get install aptitude

sudo add-apt-repository ppa:ubuntu-toolchain-r/test

sudo aptitude install gcc-7 g++-7 gfortran-7

You can add whatever other versions you want in there (https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test).

I know this is a really late reply, but I just had to install 16.04 after an update to 14.04 destroyed my proprietary nvidia drivers (or maybe it was the other way around).

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Ubuntu – How to add slave to existing update-alternatives link group

I googled this issue, and in the first three pages, there are only two relevant results. One is this no-answer problem; another is a bug report on CentOS bug tracker, update-alternatives replaces new slave links instead of adding ones.

In --install section of the Debian update-alternatives manpages, it's said that

If the alternative name specified exists already in the alternatives system's records, the information supplied will be added as a new set of alternatives for the group.

But for the time being, I'm afraid that we can achieve this only by adding all slaves to existing link group at one time, including both original and newly added slaves.

To me, configuring java alternatives, it's

sudo update-alternatives --install "/usr/bin/java" "java" "/opt/jdk-10/bin/java" 10 \
    --slave "/usr/bin/jar"          "jar"           "/opt/jdk-10/bin/jar" \
    --slave "/usr/bin/jarsigner"    "jarsigner"     "/opt/jdk-10/bin/jarsigner" \
    --slave "/usr/bin/javac"        "javac"         "/opt/jdk-10/bin/javac" \
    --slave "/usr/bin/javadoc"      "javadoc"       "/opt/jdk-10/bin/javadoc" \
    --slave "/usr/bin/javap"        "javap"         "/opt/jdk-10/bin/javap" \
    --slave "/usr/bin/javaws"       "javaws"        "/opt/jdk-10/bin/javaws"

You don't need to remove the link group first, as the current behavior is the newly added slaves completely replace original ones. Be aware that you can always use update-alternatives --display "$your_command" to view alternative status safely.

Ubuntu – Downgrade GNU Compilers Ubuntu 18.04

update-alternatives gives you the convenience of switching between different installed gcc versions. Downgrading the system gcc is almost never needed, and is generally harmful.

The error /usr/bin/gcc-6 doesn't exist from update-alternatives suggests that gcc-6 is not installed, so all you need is to install the following packages (which are found in the default 18.04 repository, bionic/universe):

sudo apt-get install gcc-6 g++-6 g++-6-multilib gfortran-6

Then, repeat the sudo update-alternatives --install step for each gcc version you wish to use.

Whenever you want to change back gcc to point to the default version shipped with Bionic, 7.3, simply run sudo update-alternatives --config gcc, which will let you pick between the available gcc versions with installed alternatives.

Also, you can always run a specific gcc version directly, by specifying the version suffix (gcc-6, gcc-7, etc).

Best Answer

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Ubuntu – How to add slave to existing update-alternatives link group

Ubuntu – Downgrade GNU Compilers Ubuntu 18.04

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