[Bug libstdc++/69657] [6 Regression] abs() not inlined after including math.h

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69657

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
<math.h> is not unrelated, it declares overloads of std::abs. If you include a
genuinely unrelated file then you get your expected output.