Public bug reported:

GCC 4.9 supports colored diagnostics. Enabling them requires either
using -fdiagnostics-color=auto or defining GCC_COLORS.

Ubuntu could enable colors in gcc by default just for those users who
already use colors for ls/grep by patching the file /etc/skel/.bashrc
with:

@@ -72,20 +72,21 @@
 # enable color support of ls and also add handy aliases
 if [ -x /usr/bin/dircolors ]; then
     test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval 
"$(dircolors -b)"
     alias ls='ls --color=auto'
     #alias dir='dir --color=auto'
     #alias vdir='vdir --color=auto'
 
     alias grep='grep --color=auto'
     alias fgrep='fgrep --color=auto'
     alias egrep='egrep --color=auto'
+    export GCC_COLORS=" "
 fi
 
 # some more ls aliases
 alias ll='ls -alF'
 alias la='ls -A'
 alias l='ls -CF'
 
 # Add an "alert" alias for long running commands.  Use like so:
 #   sleep 10; alert

** Affects: bash (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1324901

Title:
  Enable colors in GCC 4.9

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