Gcc 4.9 colors and sudo
Since version 4.9, the gcc compiler is finally able to shows a colored output, one of the many good clang’s features. This is so helpful to locate warnings and errors that you quickly become addicted to it. Unfortunately, for some questionable reasons, this feature is turned off by default. In order to use it you have to either define the environment variable
GCC_COLORS (e.g. by
export GCC_COLORS=1) or use the flag
The problem is: when you
sudo make install a CMake-generated Makefile, you get no colors. That’s because, for security reasons,
sudo resets the environment and thus
GCC_COLORS is not defined anymore. In particular this is due to the line
Defaults env_reset in the file
While I was looking for a fix to this problem, I realized that there not exists a clean solution, at least to my likings.
What I have done, at the end, is adding this line to
/etc/sudoers (you have to use
While this is an hacky solution, is the least hacky for my tastes, until I find something better. Other possible solutions, which I discarded but may be useful to others, are the following:
/etc/profile. This works only using
sudo su -instead of
sudoand I don’t want to.
sudo -Einstead of
sudo. This preserves the whole environment and can be a security mess.
sudo env "GCC_COLORS=$GCC_COLORS" make install. But obviously this is annoying and alias for it would be ugly.
Add always the flag
-fdiagnostics-color=auto. This is even more annoying.
I’m sorry, but I have to say that the only sane solution would be enabling by default the colors, like clang does.