https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105616
Bug ID: 105616
Summary: Using regex_replace throws "maybe-uninitialized"
warnings
Product: gcc
Version: 12.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: christian.morales.vega at gmail dot com
Target Milestone: ---
As can be seen in https://godbolt.org/z/qK976bqzf
Building
--------------------
#include <iostream>
#include <iterator>
#include <regex>
#include <string>
int main()
{
std::string text = "Quick brown fox";
std::regex vowel_re("a|e|i|o|u");
// write the results to an output iterator
std::regex_replace(std::ostreambuf_iterator<char>(std::cout),
text.begin(), text.end(), vowel_re, "*");
// construct a string holding the results
std::cout << '\n' << std::regex_replace(text, vowel_re, "[$&]") << '\n';
}
--------------------
(taken from https://en.cppreference.com/w/cpp/regex/regex_replace)
with "-fsanitize=address -O1 -Wmaybe-uninitialized" creates a long list of
warnings
--------------------
In file included from
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/regex:48,
from <source>:3:
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_subexpr_end() [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:290:24:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
In file included from
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/regex:63:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_subexpr_end() [with _TraitsT =
std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:287:17:
note: '__tmp' declared here
287 | _StateT __tmp(_S_opcode_subexpr_end);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_subexpr_end() [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:290:24:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_subexpr_end() [with _TraitsT =
std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:287:17:
note: '__tmp' declared here
287 | _StateT __tmp(_S_opcode_subexpr_end);
| ^~~~~
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_subexpr_begin() [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:281:24:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_subexpr_begin() [with _TraitsT =
std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:279:17:
note: '__tmp' declared here
279 | _StateT __tmp(_S_opcode_subexpr_begin);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_subexpr_begin() [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:281:24:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_subexpr_begin() [with _TraitsT =
std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:279:17:
note: '__tmp' declared here
279 | _StateT __tmp(_S_opcode_subexpr_begin);
| ^~~~~
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_backref(std::size_t) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.tcc:173:29:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
In file included from
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:400:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.tcc:
In member function 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_backref(std::size_t) [with _TraitsT =
std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.tcc:171:15:
note: '__tmp' declared here
171 | _StateT __tmp(_S_opcode_backref);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_backref(std::size_t) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.tcc:173:29:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.tcc:
In member function 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_backref(std::size_t) [with _TraitsT =
std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.tcc:171:15:
note: '__tmp' declared here
171 | _StateT __tmp(_S_opcode_backref);
| ^~~~~
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_repeat(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:263:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:189:15:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:257:17:
note: '__tmp' declared here
257 | _StateT __tmp(_S_opcode_repeat);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_repeat(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:263:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:189:15:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:257:17:
note: '__tmp' declared here
257 | _StateT __tmp(_S_opcode_repeat);
| ^~~~~
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_repeat(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:263:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:199:17:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:257:17:
note: '__tmp' declared here
257 | _StateT __tmp(_S_opcode_repeat);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_repeat(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:263:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:199:17:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:257:17:
note: '__tmp' declared here
257 | _StateT __tmp(_S_opcode_repeat);
| ^~~~~
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_repeat(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:263:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:208:15:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:257:17:
note: '__tmp' declared here
257 | _StateT __tmp(_S_opcode_repeat);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_repeat(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:263:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:208:15:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:257:17:
note: '__tmp' declared here
257 | _StateT __tmp(_S_opcode_repeat);
| ^~~~~
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_repeat(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:263:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:246:19:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:257:17:
note: '__tmp' declared here
257 | _StateT __tmp(_S_opcode_repeat);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_repeat(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:263:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:246:19:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:257:17:
note: '__tmp' declared here
257 | _StateT __tmp(_S_opcode_repeat);
| ^~~~~
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_repeat(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:263:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:264:42:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:257:17:
note: '__tmp' declared here
257 | _StateT __tmp(_S_opcode_repeat);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_repeat(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:263:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:264:42:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_quantifier() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:257:17:
note: '__tmp' declared here
257 | _StateT __tmp(_S_opcode_repeat);
| ^~~~~
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_alt(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:251:24,
inlined from 'void std::__detail::_Compiler<_TraitsT>::_M_disjunction()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:103:18:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'void std::__detail::_Compiler<_TraitsT>::_M_disjunction()
[with _TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:246:17:
note: '__tmp' declared here
246 | _StateT __tmp(_S_opcode_alternative);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_alt(std::__detail::_StateIdT,
std::__detail::_StateIdT, bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:251:24,
inlined from 'void std::__detail::_Compiler<_TraitsT>::_M_disjunction()
[with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:103:18:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'void std::__detail::_Compiler<_TraitsT>::_M_disjunction()
[with _TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:246:17:
note: '__tmp' declared here
246 | _StateT __tmp(_S_opcode_alternative);
| ^~~~~
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_word_bound(bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:309:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_assertion() [with
_TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:153:16:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_assertion() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:307:17:
note: '__tmp' declared here
307 | _StateT __tmp(_S_opcode_word_boundary);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_word_bound(bool) [with _TraitsT =
std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:309:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_assertion() [with
_TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:153:16:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_assertion() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:307:17:
note: '__tmp' declared here
307 | _StateT __tmp(_S_opcode_word_boundary);
| ^~~~~
In constructor 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]',
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_lookahead(std::__detail::_StateIdT,
bool) [with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:318:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_assertion() [with
_TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:164:8:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:405:42:
warning: '*(std::function<bool(char)>*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(char)>::_M_invoker'
may be used uninitialized [-Wmaybe-uninitialized]
405 | : _Function_base(), _M_invoker(__x._M_invoker)
| ~~~~^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_assertion() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:315:17:
note: '__tmp' declared here
315 | _StateT __tmp(_S_opcode_subexpr_lookahead);
| ^~~~~
In member function 'bool std::_Function_base::_M_empty() const',
inlined from 'std::function<_Res(_ArgTypes ...)>::operator bool() const
[with _Res = bool; _ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:574:25,
inlined from 'std::function<_Res(_ArgTypes
...)>::function(std::function<_Res(_ArgTypes ...)>&&) [with _Res = bool;
_ArgTypes = {char}]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:407:6,
inlined from
'std::__detail::_State<_Char_type>::_State(std::__detail::_State<_Char_type>&&)
[with _Char_type = char]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:149:4,
inlined from 'std::__detail::_StateIdT
std::__detail::_NFA<_TraitsT>::_M_insert_lookahead(std::__detail::_StateIdT,
bool) [with _TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:318:24,
inlined from 'bool std::__detail::_Compiler<_TraitsT>::_M_assertion() [with
_TraitsT = std::__cxx11::regex_traits<char>]' at
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_compiler.tcc:164:8:
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/std_function.h:247:37:
warning: '*(const std::_Function_base*)((char*)&__tmp +
offsetof(std::__detail::_StateT,
std::__detail::_State<char>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::_Function_base::_M_manager'
may be used uninitialized [-Wmaybe-uninitialized]
247 | bool _M_empty() const { return !_M_manager; }
| ^~~~~~~~~~
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h: In
member function 'bool std::__detail::_Compiler<_TraitsT>::_M_assertion() [with
_TraitsT = std::__cxx11::regex_traits<char>]':
/opt/compiler-explorer/gcc-12.1.0/include/c++/12.1.0/bits/regex_automaton.h:315:17:
note: '__tmp' declared here
315 | _StateT __tmp(_S_opcode_subexpr_lookahead);
| ^~~~~
--------------------
The same problem happens with Fedora 36 / gcc 12.1.1 and doesn't happen with
11.3.
Not sure if it's a problem with g++, ASAN or libstdc++.
