https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69450
--- Comment #5 from John David Anglin <danglin at gcc dot gnu.org> ---
The configure check in acinclude.m4 doesn't work:
checking for obsolete isinf and isnan functions in <math.h>... no
It appears the problem is there is an obsolete isnan but not isinf. We have
in config.log:
configure:18185: checking for obsolete isinf and isnan functions in <math.h>
configure:18209: /test/gnu/gcc/objdir/./gcc/xgcc -shared-libgcc
-B/test/gnu/gcc/objdir/./gcc -nostdinc++
-L/test/gnu/gcc/objdir/hppa2.0w-hp-hpux11.11/libstdc++-v3/src
-L/test/gnu/gcc/objdir/hppa2.0w-hp-hpux11.11/libstdc++-v3/src/.libs
-L/test/gnu/gcc/objdir/hppa2.0w-hp-hpux11.11/libstdc++-v3/libsupc++/.libs
-B/opt/gnu/gcc/gcc-6.0/hppa2.0w-hp-hpux11.11/bin/
-B/opt/gnu/gcc/gcc-6.0/hppa2.0w-hp-hpux11.11/lib/ -isystem
/opt/gnu/gcc/gcc-6.0/hppa2.0w-hp-hpux11.11/include -isystem
/opt/gnu/gcc/gcc-6.0/hppa2.0w-hp-hpux11.11/sys-include -c -g -O2 -std=c++11
conftest.cpp >&5
conftest.cpp:42:24: error: '::isinf' has not been declared
using ::isinf;
^~~~~
conftest.cpp:51:32: error: call of overloaded 'isinf(double)' is ambiguous
bool b = isinf(0.0) || isnan(0.0);
^
conftest.cpp:44:21: note: candidate: bool std::isinf(long double)
bool isinf(long double);
^~~~~
conftest.cpp:43:21: note: candidate: bool std::isinf(float)
bool isinf(float);
^~~~~
configure:18209: $? = 1
It seems like test needs to be split into two.
