AVR-Chat

Hi David,

>   Welcome to GCC!  GCC is a "big iron" compiler front end and all
> programs written for full OS's require a return code for main().  AVR is
> a custom backend of the compiler so main must be of type int for
> compatibility reasons.

Also, I highly recommend that you compile your code using -Wall. This
will cause the compiler to point out lots of little things that often
hangup the beginner.

Personally, I like my code to compile error and warning free with the
following set of compiler flags:

-Wall -Wimplicit -Wpointer-arith -Wredundant-decls -Wshadow -Wunused
-Wcast-qual -Wnested-externs -Wmissing-prototypes -Wstrict-prototypes
-Wmissing-declarations

I also often add -Werror which causes warnings to be treated as errors.

I see that there is a -Wextra as well. I'll have to play with that.

Documentation on all of the warning flags can be found over here:
<http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/Warning-Options.html#Warning-Options>

Sometimes, figuring out the correct way to get rid of a warning can be
frustrating, but after you've been doing it foe a while it becomes
second nature.

-- 
Dave Hylands
Shuswap, BC, Canada
http://www.DaveHylands.com/