Here is updated information if you are interested. I realize the
recommendation is probably to move to libc++.
This is using clang++-6.0. Updated test case regex.
clang++-6.0 -std=c++14 -O3 -g test.cpp
--
#include <regex>
#include <string>
#include <iostream>
int main() {
const std::string& output = regex_replace("test test", std::regex("^test"),
"hi");
std::cout << output << "\n";
return 0;
}
--
Crash:
* thread #1: tid = 7900, 0x0000000000418d9b a.out`std::__cxx11::sub_match<char
const*>::compare(std::__cxx11::sub_match<char const*> const&) const [inlined]
std::__cxx11::sub_match<char const*>::str(this=<unavailable>) const at
regex.h:867, name = 'a.out', stop reason = signal SIGSEGV: invalid address
(fault address: 0xffffffffffffffc8)
frame #0: 0x0000000000418d9b a.out`std::__cxx11::sub_match<char
const*>::compare(std::__cxx11::sub_match<char const*> const&) const [inlined]
std::__cxx11::sub_match<char const*>::str(this=<unavailable>) const at
regex.h:867
864 string_type
865 str() const
866 {
-> 867 return this->matched
868 ? string_type(this->first, this->second)
869 : string_type();
870 }
Backtrace:
* thread #1: tid = 7900, 0x0000000000418d9b a.out`std::__cxx11::sub_match<char
const*>::compare(std::__cxx11::sub_match<char const*> const&) const [inlined]
std::__cxx11::sub_match<char const*>::str(this=<unavailable>) const at
regex.h:867, name = 'a.out', stop reason = signal SIGSEGV: invalid address
(fault address: 0xffffffffffffffc8)
* frame #0: 0x0000000000418d9b a.out`std::__cxx11::sub_match<char
const*>::compare(std::__cxx11::sub_match<char const*> const&) const [inlined]
std::__cxx11::sub_match<char const*>::str(this=<unavailable>) const at
regex.h:867
frame #1: 0x0000000000418d9b a.out`std::__cxx11::sub_match<char
const*>::compare(this=<unavailable>, __s=0xffffffffffffffb8) const + 203 at
regex.h:883
frame #2: 0x000000000041633a
a.out`std::back_insert_iterator<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >
std::regex_replace<std::back_insert_iterator<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >, char const*,
std::__cxx11::regex_traits<char>,
char>(std::back_insert_iterator<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >, char const*, char const*,
std::__cxx11::basic_regex<char, std::__cxx11::regex_traits<char> > const&, char
const*, std::regex_constants::match_flag_type) [inlined] bool
std::__cxx11::operator==<char const*>(__lhs=<unavailable>, __rhs=<unavailable>)
+ 12 at regex.h:938
frame #3: 0x000000000041632e
a.out`std::back_insert_iterator<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >
std::regex_replace<std::back_insert_iterator<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >, char const*,
std::__cxx11::regex_traits<char>,
char>(std::back_insert_iterator<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >, char const*, char const*,
std::__cxx11::basic_regex<char, std::__cxx11::regex_traits<char> > const&, char
const*, std::regex_constants::match_flag_type) [inlined]
std::__cxx11::regex_iterator<char const*, char,
std::__cxx11::regex_traits<char> >::operator==(this=0x0000000000419538) const +
32 at regex.tcc:517
frame #4: 0x000000000041630e
a.out`std::back_insert_iterator<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >
std::regex_replace<std::back_insert_iterator<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > >, char const*,
std::__cxx11::regex_traits<char>, char>(__out=(container = "�����),
__first="test test", __last="", __e=<unavailable>, __fmt="hi", __flags=0) + 46
at regex.tcc:480
frame #5: 0x0000000000401e3b a.out`main [inlined]
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
std::regex_replace<std::__cxx11::regex_traits<char>, char>(__s=<unavailable>,
__e=<unavailable>, __fmt=<unavailable>, __flags=0) + 91 at regex.h:2418
frame #6: 0x0000000000401e03 a.out`main + 35 at test.cpp:7
frame #7: 0x00007ffff718c830 libc.so.6`__libc_start_main(main=(a.out`main
at test.cpp:6), argc=1, argv=0x00007fffffffd9f8, init=<unavailable>,
fini=<unavailable>, rtld_fini=<unavailable>, stack_end=0x00007fffffffd9e8) +
240 at libc-start.c:291
frame #8: 0x0000000000401d09 a.out`_start + 41
--
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https://bugs.launchpad.net/bugs/1748344
Title:
clang++ regex_replace always segfaults with -O3
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https://bugs.launchpad.net/ubuntu/+source/llvm-defaults/+bug/1748344/+subscriptions
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