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Fix warnings from stringifying functions

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The only way to stream those is to use the `bool` overload of `op<<`.
However, to convert a function to bool, GCC creates AST equivalent
of `A? true : false`. Then, because `A` is a function, it warns that
it will never be `false`. 🤦

As a bonus, newer GCC versions issue _two_ different warnings about
this, but older GCC versions do not know both of them, so we also
have to suppress warning about unknown warning suppression.
This commit is contained in:
Martin Hořeňovský 2020-02-25 10:40:41 +01:00
parent 8d1e7ca896
commit 33b47f7309
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1 changed files with 16 additions and 0 deletions
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16
src/catch2/catch_stream.h
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@ -39,11 +39,27 @@ namespace Catch {
auto str() const -> std::string;
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic push
// Old versions of GCC do not understand -Wnonnull-compare
#pragma GCC diagnostic ignored "-Wpragmas"
// Streaming a function pointer triggers Waddress and Wnonnull-compare
// on GCC, because it implicitly converts it to bool and then decides
// that the check it uses (a? true : false) is tautological and cannot
// be null...
#pragma GCC diagnostic ignored "-Waddress"
#pragma GCC diagnostic ignored "-Wnonnull-compare"
#endif
template<typename T>
auto operator << ( T const& value ) -> ReusableStringStream& {
*m_oss << value;
return *this;
}
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic pop
#endif
auto get() -> std::ostream& { return *m_oss; }
};
}