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Without compiling code, I would like GCC or Clang to report warnings.
Is it possible to run the compiler for static analysis only?
I can't find a way to pass the compiler warning flags and tell it not to compile.
edit: just found that clang has a static analyser
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If -Wfatal-errors is also specified, then -Wfatal-errors takes precedence over this option. Inhibit all warning messages. Make all warnings into errors.
gcc -Wall enables all compiler's warning messages. This option should always be used, in order to generate better code.
You can use a #pragma warning directive to control the level of warning that's reported at compile time in specific source files. Warning pragma directives in source code are unaffected by the /w option.
Both GCC and Clang have an option -fsyntax-only that makes the compiler only perform syntax checking without any actual compilation.
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In addition to the other replies, gcc is doing some analysis during compilation (and even during some optimization passes). So you could discard the generated code and still get all the warnings with e.g. gcc -Wall -O -c code.c -o /dev/null
Notice that you could extend GCC with your additional passes doing some additional, application specific, checks and warnings, e.g. with MELT (a high level domain specific language to extend GCC).
If you want strong static analysis and are willing to give additional annotations for that purpose consider also Frama C.
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