re PR libstdc++/69450 (libstdc++-v3/include/math.h:66:1 2: error: 'constexpr bool std::isnan(double)' conflicts with a previous declaration)
PR libstdc++/69450
* acinclude.m4 (GLIBCXX_CHECK_MATH11_PROTO): Split check for obsolete
isinf and isnan functions into two independent checks. Check on hpux.
* config.h.in: Regenerate.
* configure: Regenerate.
* include/c_global/cmath (isinf(double), isnan(double)): Use
_GLIBCXX_HAVE_OBSOLETE_ISINF and _GLIBCXX_HAVE_OBSOLETE_ISNAN,
respectively.
From-SVN: r232925