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An Introduction to GCC - for the GNU compilers gcc and g++
by Brian J. Gough, foreword by Richard M. Stallman
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ISBN 0954161793
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3.6 Recommended warning options

The following options are a good choice for finding problems in C and C++ programs:

$ gcc -ansi -pedantic -Wall -W -Wconversion 
    -Wshadow -Wcast-qual -Wwrite-strings

While this list is not exhaustive, regular use of these options will catch many common errors.

ISBN 0954161793An Introduction to GCC - for the GNU compilers gcc and g++See the print edition