If the locale of your environment isn’t compatible with the terminal you are using, g++ will spit out weird characters. To check your current locale in Linux, use the command “locale” from the command prompt. en_US.UTF-8 encoding was giving me the weird characters in a 32-bit CentOS distro running on a vmware machine.
Enter the commands: “export LC_ALL=C” and “export LANG=C”
After changing the locales, the characters in my g++ error messages disappeared but only for my current terminal session. To change it permanently, I had to change the default locale setting.
Change the default locale in CentOS:
edit the file: /etc/sysconfig/i18n
edit the first line to be: LANG=”C”
All other terminal sessions should use the POSIX/C locale as the default now.