http://bugzilla.novell.com/show_bug.cgi?id=963700 http://bugzilla.novell.com/show_bug.cgi?id=963700#c9 --- Comment #9 from Michael Matz --- Confirmed with e.g.: % cat x.cc #include <cmath> using namespace std; int f (double d) { return isinf(d); } % g++-5 -std=c++11 -c x.cc The fix for GCC bug PR48891 wasn't ever applied to the gcc-5 branch, and so the whole compatibility code to deal with the obsolete functions is missing. We'd either have to change GCC to add the compat code (perhaps also for older GCCs than only 5), or add the patch d9b965fa56350d6eea9f7f438a0714c7ffbb183f (and the followup https://www.sourceware.org/ml/libc-alpha/2016-02/msg00020.html ) to our old glibcs to not export the conflicting obsolete functions for C++. Or accept that older GCCs don't work in c++11 mode with older glibc regarding these three functions. GCC 6 and glibc 2.23 are coming anyway in a couple weeks. If we want to fix anything, GCC is probably easier, because glibc comes directly from SLE12 and is more complicated to change. -- You are receiving this mail because: You are on the CC list for the bug.