You can go further and specify a particular standard, plus extra warnings not included in -Wall:
gcc -std=c99 -Wall -Wextra -Werror
I'm not sure if -pedantic is still beneficial in that case. The gcc documentation had a list of every warning category, and which parameters enable each warning. This SO question was also interesting: http://stackoverflow.com/questions/11714827/how-to-turn-on-l...
-std=cNN specifies the base language standard. Much existing code depends on GCC extensions to that standard (for better or for worse), so it is often necessary to use -std=gnuNN instead (specifying base language dialect + extensions).
