Recommended gcc warning options for C [closed]

Question

Other than -Wall what other warnings have people found useful?

http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/Warning-Options.html

Answer 1

I started out with C++, so when I made the switch to learning C I made sure to be extra-anal:

-fmessage-length=0
-ansi -pedantic -std=c99
-Werror
-Wall
-Wextra
-Wwrite-strings
-Winit-self
-Wcast-align
-Wcast-qual
-Wpointer-arith
-Wstrict-aliasing
-Wformat=2
-Wmissing-declarations
-Wmissing-include-dirs
-Wno-unused-parameter
-Wuninitialized
-Wold-style-definition
-Wstrict-prototypes
-Wmissing-prototypes

Answer 2

I usually compile with "-W -Wall -ansi -pedantic" this helps ensure maximum quality and portability of the code.

Answer 3

-pedantic-errors

Answer 4

Right now I use:

-Wall -W -Wextra -Wconversion -Wshadow -Wcast-qual -Wwrite-strings -Werror

I took that list mostly from the book "An introduction to gcc" and then some from Ulrich Drepper recomendation about Defensive Programming (http://people.redhat.com/drepper/Defensive-slides.pdf).

But I don't have any science behind my list, it just felt like a good list.

/Johan

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Note: I don't like those pedantic flags though....

Note: I think that -W and -Wextra are more or less the same thing.

Answer 5

-Wfatal-errors

Answer 6

I like -Werror. Keeps the code warning free.