Ubuntu 16.04: unsupported GNU version! gcc versions later than 4.9 are not supported!

[hughperkins]

Ubuntu 16.04: unsupported GNU version! gcc versions later than 4.9 are not supported!

I have gcc4.9 installed. In Torch, I can select gcc4.9 by doing:

export CC=gcc-4.9
export CXX=g++-4.9

Unclear how to do this for Neon?

[hughperkins]

Following http://stackoverflow.com/questions/6622454/cuda-incompatible-with-my-gcc-version#comment56532695_8693381 I did

$ sudo ln -s /usr/bin/gcc-4.9 /usr/local/cuda/bin/gcc
$ sudo ln -s /usr/bin/g++-4.9 /usr/local/cuda/bin/g++

... to solve this.

[tambetm]

Slightly nicer and more Ubuntuish would be to use:

$ sudo update-alternatives --config gcc

[buriy]

@tambetm You also need sudo update-alternatives --install then : http://askubuntu.com/a/26518/346907 , also having multiple versions of gcc with update-alternatives isn't considered a good option ( why: http://askubuntu.com/a/26500/346907 ).
Also, even after installing gcc-4.9, you will have 5.3 version of linux headers.
So anyway it's only a workaround for the scripts not aware of CC / CXX flags, and that's why manually linking is ok here.

[hughperkins]

Slightly nicer and more Ubuntuish would be to use:

This is a system level modification, and may come back to bite you later. For example, what happens if you build a project that has c++ linkings to a system installed library?

My change:

• is strictly limited to cuda-7.5 installation, which was broken anyway
• will be purged automatically, as soon as I upgrade to cuda-8.0

[tastyminerals]

In case @hughperkins solution does not work for some of you sitting on Archlinux or Manjaro. You should create links to /usr/bin/gcc and /usr/bin/g++ instead of /usr/local/cuda/bin. Before doing that don't forget to rename the original binaries! That will be needed if you decide to run ~/torch/install/bin/luarocks separately or if you're a Manjaro user.

Manjaro users should also add the following condition to install.sh in order to install everything smoothly:

# If we're on Manjaro linux, use gcc v49
if [[ `uname -a` == *"MANJARO"* ]]; then
    path_to_gcc49=$(which gcc-4.9)
    if [ -x "$path_to_gcc49" ]; then
      export CC="$path_to_gcc49"
    else
      echo "Warning: GCC v4.9 not found. CUDA v8 is incompatible with GCC v6, if installation fails, consider running \$ pacman -S gcc49"
    fi
fi

[hookover]

@hughperkins
event:
ubuntu 16.04 default gcc version 5.3
cuda7.5
tensorflow1.0.1

I do this:

$ sudo ln -s /usr/bin/gcc-4.9 /usr/local/cuda/bin/gcc
$ sudo ln -s /usr/bin/g++-4.9 /usr/local/cuda/bin/g++

☁ build [master] ⚡ gcc --version

gcc (Ubuntu 4.9.3-13ubuntu2) 4.9.3
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

☁ build [master] ⚡ g++ --version

g++ (Ubuntu 4.9.3-13ubuntu2) 4.9.3
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

☁ build [master] ⚡ make

[ 10%] Building NVCC (Device) object CMakeFiles/warpctc.dir/src/warpctc_generated_reduce.cu.o
In file included from /usr/local/cuda/include/cuda_runtime.h:76:0,
                 from <command-line>:0:
/usr/local/cuda/include/host_config.h:115:2: error: #error -- unsupported GNU version! 
gcc versions later than 4.9 are not supported!
 #error -- unsupported GNU version! gcc versions later than 4.9 are not supported!
  ^
CMake Error at warpctc_generated_reduce.cu.o.cmake:207 (message):
  Error generating
  /srv/python/lstm_ctc_ocr_with_tf_1.0.1/warp-ctc/build/CMakeFiles/warpctc.dir/src/./warpctc_generated_reduce.cu.o


CMakeFiles/warpctc.dir/build.make:336: recipe for target 'CMakeFiles/warpctc.dir/src/warpctc_generated_reduce.cu.o' failed
make[2]: *** [CMakeFiles/warpctc.dir/src/warpctc_generated_reduce.cu.o] Error 1
CMakeFiles/Makefile2:141: recipe for target 'CMakeFiles/warpctc.dir/all' failed
make[1]: *** [CMakeFiles/warpctc.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2

ooooh no...

[Aurora11111]

I meet this problem ,and I sloved it just by uninstall old gcc,and reinstall a gcc with verison of 4.9:
1.uninstall gcc
sudo pacman -Rsc gcc
2.reinstall gcc
mkdir -p $HOME/build/
cd $HOME/build/
git clone https://aur.archlinux.org/gcc49.git
cd gcc49
makepkg --syncdeps
sudo pacman --upgrade gcc-4.9.3-1-x86_64.pkg.tar.xz

[abduallahnoorsayket]

Error: No results matching query were found.

how can i fix this issue ?? i am using ubantu 18+

[freedom9393]

This solved my problem:

sudo rm /usr/local/cuda/bin/gcc
sudo rm /usr/local/cuda/bin/g++
sudo apt install gcc-4.9 g++-4.9
sudo ln -s /usr/bin/gcc-4.9 /usr/local/cuda/bin/gcc
sudo ln -s /usr/bin/g++-4.9 /usr/local/cuda/bin/g++

[yousefis]

I do not have an admin permission, any solutions?