Spell "not exist" correctly.
Use -fno-common for perfomance reasons and -fvisibility to save some space in .dynstr section.
Use link time optimization.
Install clang 3.5.
Install ld.gold.
Install clang 3.5.
Install clang 3.5 from llvm repository.
Correct clang repository.
Add backport gcc 4.8.
Yet another test.
Remove clang 3.4
Remove whole clang 3.4 infrastructure.
Correct clang versions.
Don't use LTO when building with travis.
Make clang build verbose.
Print message whe running travis.
Correct environment variable check.
Make build a bit quieter.
Make link time optimization dependent on the compiler version.
Make multithreaded LTO build dependend on the compiler version.