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Everywhere: Warn on function definitions without prototypes

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If no header includes the prototype of a function, then it cannot be
used from outside the translation unit it was defined in. In that case,
it should be marked as `static`, in order to avoid possible ODR
problems, unnecessary exported symbols, and allow the compiler to better
optimize those.

If this warning triggers in a function defined in a header, `inline`
needs to be added, otherwise if the header is included in more than one
TU, it will fail to link with a duplicate definition error.

The reason this diff got so big is that Lagom-only code wasn't built
with this flag even in Serenity times.
This commit is contained in:
Daniel Bertalan
2024-07-14 18:29:33 +02:00
parent 7fe82a1cda
commit c62240aa80
24 changed files with 146 additions and 97 deletions
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2
AK/Assertions.h
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@@ -21,8 +21,8 @@ static constexpr bool TODO = false;
#define TODO_PPC64() VERIFY(TODO) /* NOLINT(cert-dcl03-c,misc-static-assert) No, this can't be static_assert, it's a runtime check */
#define TODO_PPC() VERIFY(TODO) /* NOLINT(cert-dcl03-c,misc-static-assert) No, this can't be static_assert, it's a runtime check */
#ifndef NDEBUG
extern "C" __attribute__((noreturn)) void ak_assertion_failed(char const*);
#ifndef NDEBUG
# define ASSERT(expr) \
(__builtin_expect(!(expr), 0) \
? ak_assertion_failed(#expr " at " __FILE__ ":" __stringify(__LINE__)) \