The key for compilation -Wconversion is very important. Its absence by default hides programming errors on different platforms. It is desirable to include this key with the help -Wall.
-- Summary: key for compilation -Wconversion Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: lisp2d at lisp2d dot net http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38055