[SANTUARIO-527] Compilation error with C++20 standard

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: C++ 2.0.2
• Component/s: C++
• Assignee: Scott Cantor
• Reporter: Laurent Stacul
• Created: 20/Feb/20 03:25
• Updated: 27/Mar/24 08:39
• Resolved: 27/Mar/24 08:39

Description

System information:

 

$ uname -a
Linux ncerndobedev6196 4.12.14-95.45-default #1 SMP Wed Dec 11 13:09:13 UTC 2019 (12c8180) x86_64 x86_64 x86_64 GNU/Linux
$ libc.so.6 --version
GNU C Library (GNU libc) stable release version 2.31. Copyright (C) 2020 Free Software Foundation, Inc.
$ /gcc --version
gcc (GCC) 10.0.1 20200211 (experimental) Copyright (C) 2020 Free Software Foundation, Inc.

Compiling with -std=gnu++2a. Received kind of errors:

tools/xklient/xklient.cpp: In function 'int main(int, char**)':
tools/xklient/xklient.cpp:4729:30: error: use of deleted function 'std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char16_t*) [with _Traits = std::char_traits<char>]'
 4729 | << e.getMessage() << endl;
 | ^
In file included from /opt/1A/toolchain/x86_64-v20.0.8/include/c++/10.0.1/iostream:39,
 from tools/xklient/xklient.cpp:83:
/opt/1A/toolchain/x86_64-v20.0.8/include/c++/10.0.1/ostream:645:5: note: declared here
 645 | operator<<(basic_ostream<char, _Traits>&, const char16_t*) = delete;
 | ^~~~~~~~

The root cause is that several overloads of std::basic_ostream::operator<< were removed (in particular the one dealing with charXX_t as described here: https://en.cppreference.com/w/cpp/io/basic_ostream/operator_ltlt2.