https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69413
Bug ID: 69413 Summary: [6 Regression] r232327 prevents libstdc++ working after upgrading glibc to 2.23 Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: redi at gcc dot gnu.org Target Milestone: --- The fixes for PR 48891 require libstdc++ to be rebuilt after upgrading glibc to current trunk (which will be 2.23), because the configure-time checks for isinf and isnan give the wrong answer for the new glibc. There needs to be a compile-time check so that rebuilding gcc isn't needed (or glibc needs to define a macro telling us the isinf and isnan declarations have been suppressed).