Fallback option for colorized output when terminfo isn't available

Try to detect the terminal color support by checking the value of the
TERM environment variable. This is not great, but it's better than
nothing when terminfo library isn't available, which may still be the
case on some Linux distributions.

Differential Revision: https://reviews.llvm.org/D42055

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@322962 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed