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With this change stacktrace entries always output the frame address, and source file information no longer results in " at :0", e.g. 16# myfunc(int) at /tmp/bt.cc:48 [0x4008b7] 17# main at /tmp/bt.cc:61 [0x40091a] 18# __libc_start_call_main [0x7efc3d6d3574] 19# __libc_start_main@GLIBC_2.2.5 [0x7efc3d6d3627] 20# _start [0x400684] This replaces the previous output: 16# myfunc(int) at /tmp/bt.cc:48 17# main at /tmp/bt.cc:61 18# __libc_start_call_main at :0 19# __libc_start_main@GLIBC_2.2.5 at :0 20# _start at :0 A change that is not visible in the examples above is that for a non-empty stacktrace_entry, we now print "<unknown>" for the function name if description() returns an empty string. For an empty (e.g. default constructed) stacktrace_entry the entire string representation is now "<unknown>" instead of an empty string. Instead of printing "<unknown>" for the function name, we could set that string in the stacktrace_entry::_Info object, so that description() returns "<unknown>" and then operator<< wouldn't need to handle an empty description() string. However, returning an empty string from that function seems simpler for users to detect, rather than having to parse "<unknown>". We could also choose a different string for an empty stacktrace_entry, maybe "<none>" or "<invalid>", but "<unknown>" seems good. libstdc++-v3/ChangeLog: * include/std/stacktrace (operator<<(ostream&, const stacktrace_entry&)): Improve output when description() or source_file() returns an empty string, or the stacktrace_entry is invalid. Append frame address to output. (operator<<(ostream&, const basic_stacktrace<A>&)): Use the size_type of the correct specialization. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com> Reviewed-by: Nathan Myers <nmyers@redhat.com>
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.