How can I fix error in Travis CI in gcc C++ compiler?

Question

I'm developing a class for working with texts in C++ (training project). I connected a Travis CI to my git repository to test the code. First build broke with such an error:

The command "if [ $TRAVIS_OS_NAME == linux ]; then sudo apt-get install -y llvm-3.4 llvm-3.4-dev; fi" failed and exited with 100 during .

Could someone please explain to me for what caused this error and how to fix it?

Here is my repository if needed: https://github.com/SemenutaEgor/Text

Answer 1

You should actually read the full output that Travis gives you:

E: Unable to locate package llvm-3.4

E: Couldn't find any package by glob 'llvm-3.4'

E: Couldn't find any package by regex 'llvm-3.4'

E: Unable to locate package llvm-3.4-dev

E: Couldn't find any package by glob 'llvm-3.4-dev'

E: Couldn't find any package by regex 'llvm-3.4-dev'

The command "if [ $TRAVIS_OS_NAME == linux ]; then sudo apt-get install -y llvm-3.4 llvm-3.4-dev; fi" failed and exited with 100 during .

The packages llvm-3.4 and llvm-3.4-dev are simply not available in the repository. If you check the build system information, you will see:

Operating System Details

Distributor ID: Ubuntu

Description:    Ubuntu 16.04.6 LTS

Release:    16.04

Codename:   xenial

You can try to find out wich llvm packages are available in Ubuntu 16.04 by an online search. Alternatively, you can add apt-cache search --names-only llvm as the first command in the before_install section of your .travis.yml to get a list of available llvm packages. The run will still fail until you replace the version numbers with one from the list.