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use gcc 5.x on ubuntu 14.04
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-5 g++-5
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 60 --slave /usr/bin/g++ g++ /usr/bin/g++-5
@paomian
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paomian commented Sep 11, 2017

gcc7

sudo add-apt-repository ppa:jonathonf/gcc-7.1
sudo apt-get update
sudo apt-get install gcc-7 g++-7

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

@NorimasaNabeta
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thx

@bryceschober
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WARNING @beci @vineeshvs @hallahan @Antttooon @MagnetonBora @rrogers @dtamez @benzkji @NorimasaNabeta:

The ppa:ubuntu-toolchain-r/test has old compiler builds that don't correctly compile some dkms kernel drivers, like nVidia, and you can get your installation pretty broken with the compilers from this PPA. See this launchpad issue for details.

@SeanSyue
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SeanSyue commented Mar 14, 2018

update-alternatives: error:

I'm working on Ubuntu 16.04. The first three code ran properly, but when I was running the code

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

I got the error:

update-alternatives: error: alternative g++ can't be slave of gcc: it is a master alternative

Can someone answer me what may have gone wrong?

@sg552
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sg552 commented Apr 11, 2018

good job, works , thank you!

@rehmanzafar
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Thank you, it worked.

@mathieu-aubin
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fast&clean

kudos

@apoorva-js
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@SeanSyue I'm got the same error as yours. Can you please help me if you figured it out.

@JOELEJAUNE
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thank you

@dongnhzigexn
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It works like a charm on Ubuntu 18.04. Thank you 👍

@anandbhaskaran
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Thanks

@sahilastangocharlie
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worked .....thanks

@Tectract
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ppa:ubuntu-toolchain-r/test

seems like it's not being updated or bugfixed properly and could even leave your Ubuntu 14.04 machine in an unbootable state. Beware...

See here a bunch of people breaking their installations of apt-get and gnome by blindly using that repo:

https://askubuntu.com/questions/777803/apt-relocation-error-version-glibcxx-3-4-21-not-defined-in-file-libstdc-so-6#

@Nukemenonai
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the following error appears when trying to compile using the flag -fsanitize=signed-integer-overflow

/usr/bin/ld: unrecognized option '--push-state--no-as-needed'
/usr/bin/ld: use the --help option for usage information

@aspenstarss
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It's work for me!
Thanks!

@mandardeshmukh03
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mandardeshmukh03 commented Dec 21, 2021

For me this worked:
sudo apt-add-repository "deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu trusty main"
sudo apt-get update
sudo apt-get install gcc-5 g++-5

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