Ethminer: CUDA 9.0 unsupported gcc versions later than 6

[Rodriguevb]

Following these steps :

• Use virtualbox and install Ubuntu Server
• git clone this repo
• sudo ./scripts/install_cmake.sh
• sudo ./scripts/install-cuda-ubuntu1604.sh (<<< install gcc-7)
• /home/username/.local/bin/cmake -D CUDA_TOOLKIT_ROOT_DIR=/usr/local/cuda-9.0 .. -DETHASHCUDA=ON -DETHASHCL=OFF
• /home/username/.local/bin/cmake --build .

And gets CMake Error unsupported GNU version! gcc versions later than 6 are not supported!
But the script install-cuda-ubuntu1604.sh install gcc-7.. What i need to do ?

[jean-m-cyr]

@Rodriguevb I don't think the miner will work very well, if at all, in a virtualized environment.

[Rodriguevb]

@jean-m-cyr No doesn't work, but i just want to compile ethminer with specific requirements like gcc version 6 max and then I transfer to my miner :)

[piotr-dobrogost]

For what it's worth I managed to compile ethminer with CUDA 9.1 and gcc 7.2 on Fedora 27 making change described at https://davidwpearson.wordpress.com/2017/12/21/installing-nvidias-cuda-9-1-on-fedora-27/

[MariusVanDerWijden]

You can use -DCMAKE_C_COMPILER=/usr/bin/gcc-6 to specify the path of the compiler

[alkmim]

You can also use this Dockerfile: https://github.com/alkmim/ethminer-docker

It will build using gcc-5.

[StoneCypher]

it doesn't seem like this should be closed

i just set up a new ubuntu box and this appears to be a roadblock

[MariusVanDerWijden]

You need to download gcc-6 and use -DCMAKE_C_COMPILER=/usr/bin/gcc-6 to specify the path of the compiler. CUDA doesn't work with later gcc versions

[alkmim]

@StoneCypher Sorry for the question, but is there any reason why not use https://github.com/alkmim/ethminer-docker ?

Even using a new ubuntu box, you should be able to build ethminer using cuda9 driver.

[RustyRaptor]

guys just use

sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-6 10

and

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 10

I hope this helped.

[travis-cramer]

@RustyRaptor Great solution. Worked for me.

[askerlee]

@RustyRaptor thanks it works. Do I need to revert it to gcc7 after installation?

[RustyRaptor]

@askerlee you don't have to revert it unless you are going to compile a project that requires GCC7.

[Diyago]

update-alternatives: error: alternative path /usr/bin/gcc-6 doesn't exist
how can I fix that

[MariusVanDerWijden]

You have to install gcc-6
e.g. 'sudo apt-get install gcc-6'

[Diyago]

E: Unable to locate package gcc-6
(

[MariusVanDerWijden]

For Ubuntu xenial (16.04)
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-6 g++-6

[RustyRaptor]

Yeah. I think everyone should just upgrade to 18.04 at this point. My coworker was having trouble with it too. It's a 2-year-old release now lol.

[pranavnijampurkar33]

All those who are still struggling even if applying above solutions. I followed above and still failed to remove issue. I tried script located in following ling . Hope it helps you....!!!!
https://gist.github.com/zuyu/7d5682a5c75282c596449758d21db5ed

[Zumbalamambo]

Give this man @RustyRaptor a Noble Prize on saving lives!!!!!!!!!!!!!

[lisa676]

For those who are still facing this issue.
I was unable to solve my problem using above mentioned methods.
My system specification is

• Python 3.7

• CUDA 9, CuDNN 7.5 using RTX-2060

• Ubuntu 18 having GCC/G++ 7.5

I solved my issue by using following method,

sudo apt remove gcc gcc-7 g++ g++-7
sudo apt install gcc-6 g++-6

and then using above mentioned commands

sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-6 10
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 10