[PATCH] Warning for main returning a bool.

Michał Górny via cfe-commits cfe-commits at lists.llvm.org
Sun Nov 6 01:18:03 PDT 2016

On Fri, 14 Oct 2016 17:17:59 +0000
Joshua Hurwitz via cfe-commits <cfe-commits at lists.llvm.org> wrote:

> See attached.
> Returning a bool from main is a special case of return type mismatch. The
> common convention when returning a bool is that 'true' (== 1) indicates
> success and 'false' (== 0) failure. But since main expects a return value
> of 0 on success, returning a bool is usually unintended.

This triggers a false positive if you use a boolean expression like:

  return !foo;

i.e. whenever user intentionally inverts a 'non-zero success' into 'zero

Best regards,
Michał Górny
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