c - Is there any way to get gcc or clang to warn on explicit casts?

Question

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!

Answer 1

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.