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    <p>This is a set of extra-paranoid flags I'm using for C++ code:</p> <pre><code> -g -O -Wall -Weffc++ -pedantic \ -pedantic-errors -Wextra -Waggregate-return -Wcast-align \ -Wcast-qual -Wchar-subscripts -Wcomment -Wconversion \ -Wdisabled-optimization \ -Werror -Wfloat-equal -Wformat -Wformat=2 \ -Wformat-nonliteral -Wformat-security \ -Wformat-y2k \ -Wimplicit -Wimport -Winit-self -Winline \ -Winvalid-pch \ -Wunsafe-loop-optimizations -Wlong-long -Wmissing-braces \ -Wmissing-field-initializers -Wmissing-format-attribute \ -Wmissing-include-dirs -Wmissing-noreturn \ -Wpacked -Wpadded -Wparentheses -Wpointer-arith \ -Wredundant-decls -Wreturn-type \ -Wsequence-point -Wshadow -Wsign-compare -Wstack-protector \ -Wstrict-aliasing -Wstrict-aliasing=2 -Wswitch -Wswitch-default \ -Wswitch-enum -Wtrigraphs -Wuninitialized \ -Wunknown-pragmas -Wunreachable-code -Wunused \ -Wunused-function -Wunused-label -Wunused-parameter \ -Wunused-value -Wunused-variable -Wvariadic-macros \ -Wvolatile-register-var -Wwrite-strings </code></pre> <p>That should give you something to get started. Depending on a project, you might need to tone it down in order to not see warning coming from third-party libraries (which are usually pretty careless about being warning free.) For example, Boost vector/matrix code will make g++ emit a lot of noise.</p> <p>A better way to handle such cases is to write a wrapper around g++ that still uses warnings tuned up to max but allows one to suppress them from being seen for specific files/line numbers. I wrote such a tool long time ago and will release it once I have time to clean it up.</p>
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    1. POBest compiler warning level for C/C++ compilers?
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    1. USFrancisco de la Peña
    1. USAlexander L. Belikoff
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    1. COSomeone asked a similar question as gcc-specific, and this post was referenced. I updated this answer to remove duplicate warnings (for instance, -Wformat=2 implies -Wformat-y2k). See: http://stackoverflow.com/a/9862800/852254
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      1. USDavid Stone
 

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