[Bug c++/102916] cmath constexpr can lead to ODR violations/incorrect results

[Darrell.Wright at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102916

--- Comment #2 from Darrell Wright <Darrell.Wright at gmail dot com> ---
The constexpr value returned is different depending on the compiler.  If one
uses clang and gcc this leads to an ODR issue as 

void bar( ) {
  if constexpr( foo<[]{ return std::sqrt( 4.0 ); }>( ) ) {
    doA( );
  } else {
    doB( );
  }
}