[PATCH] libstdc++: Improve ostream output for std::stacktrace

[Nathan Myers]

On 10/15/25 9:54 PM, Nathan Myers wrote:
> On 10/15/25 5:02 PM, Jonathan Wakely wrote:
...
>> --- a/libstdc++-v3/include/std/stacktrace
>> +++ b/libstdc++-v3/include/std/stacktrace
>> @@ -134,6 +134,21 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>>       friend ostream&
>>       operator<<(ostream&, const stacktrace_entry&);
>> +    struct _Print_pc
>> +    {
>> +      native_handle_type _M_pc;
>> +
>> +      friend ostream&
>> +      operator<<(ostream& __os, _Print_pc __pc)
>> +      {
>> +    if (__pc._M_pc != (native_handle_type)-1) [[likely]]
>> +      __os << "[0x" << std::hex << __pc._M_pc << std::dec << ']';
> 
> Maybe save the output radix, and restore it.

Like

   auto __flags = __os.setf(__os.hex, __os.basefield);
   __os << "[0x" << __pc._M_pc << ']';
   __os.flags(__flags);