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What I'm trying to do is find all explicit casts from type double or float to any other type in some source files I have. Is there a built-in gcc way to do this? Language is C. Thanks!
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This warning is enabled by -Wall or -Wextra . Warn when a #pragma directive is encountered that is not understood by GCC. If this command-line option is used, warnings are even issued for unknown pragmas in system header files. This is not the case if the warnings are only enabled by the -Wall command-line option.
-Wno-coverage-invalid-line-number can be used to disable the warning or -Wno-error=coverage-invalid-line-number can be used to disable the error. Suppress warning messages emitted by #warning directives.
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.
The C++ compiler comes with a lot of useful warnings that warn you about potential errors and issues in your code. You always want to compile with warnings. A warning flag starts with -W and then the name of the warning, for example -Wconversion which warns about implicit conversions.
If your C code can also be compiled in C++ mode, you can use g++'s -Wold-style-cast warning flag to trigger a warning on all such casts.
You can determine whether Clang has any warnings which will trigger for a particular coding pattern by using its -Weverything switch (but note that this is not useful for almost any other purpose -- clang has disabled-by-default warnings which trigger on various forms of legitimate code). However, in this case, clang does not have any warnings which trigger on such casts.
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