Public bug reported:
There is a significant incompatibility here which leaves the default C++
compiler broken with C++17 std::filesystem usage. Unfortunately, there
isn't an obvious workaround since there's only one libstdc++6 package,
and it's using the non-default and unreleased GCC9 version of libstdc++,
making it impossible to use the compatible GCC8 version of the library.
% cat testpath.cpp
#include <filesystem>
int main()
{
std::filesystem::path p("test");
}
g++-9 -std=c++17 -lstdc++fs -g3 -o testpath testpath.cpp
% ./testpath
% g++-8 -std=c++17 -lstdc++fs -g3 -o testpath testpath.cpp
% ./testpath
zsh: segmentation fault (core dumped) ./testpath
% gdb testpath
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Reading symbols from testpath...
(gdb) run
Starting program: /tmp/testpath
Program received signal SIGSEGV, Segmentation fault.
0x000055555555649b in std::vector<std::filesystem::__cxx11::path::_Cmpt,
std::allocator<std::filesystem::__cxx11::path::_Cmpt> >::~vector (this=0x23,
__in_chrg=<optimised out>) at /usr/include/c++/8/bits/stl_vector.h:567
567 std::_Destroy(this->_M_impl._M_start, this->_M_impl._M_finish,
(gdb) bt
#0 0x000055555555649b in std::vector<std::filesystem::__cxx11::path::_Cmpt,
std::allocator<std::filesystem::__cxx11::path::_Cmpt> >::~vector (this=0x23,
__in_chrg=<optimised out>) at /usr/include/c++/8/bits/stl_vector.h:567
#1 0x0000555555556314 in std::filesystem::__cxx11::path::~path (this=0x3,
__in_chrg=<optimised out>)
at /usr/include/c++/8/bits/fs_path.h:208
#2 0x0000555555556f5c in std::filesystem::__cxx11::path::_Cmpt::~_Cmpt
(this=0x3, __in_chrg=<optimised out>)
at /usr/include/c++/8/bits/fs_path.h:643
#3 0x0000555555556f77 in std::_Destroy<std::filesystem::__cxx11::path::_Cmpt>
(__pointer=0x3)
at /usr/include/c++/8/bits/stl_construct.h:98
#4 0x0000555555556e27 in
std::_Destroy_aux<false>::__destroy<std::filesystem::__cxx11::path::_Cmpt*> (
__first=0x3, __last=0x0) at /usr/include/c++/8/bits/stl_construct.h:108
#5 0x0000555555556a98 in std::_Destroy<std::filesystem::__cxx11::path::_Cmpt*>
(__first=0x3, __last=0x0)
at /usr/include/c++/8/bits/stl_construct.h:137
#6 0x00005555555567a9 in std::_Destroy<std::filesystem::__cxx11::path::_Cmpt*,
std::filesystem::__cxx11::path::_Cmpt> (__first=0x3, __last=0x0) at
/usr/include/c++/8/bits/stl_construct.h:206
#7 0x00005555555564b1 in std::vector<std::filesystem::__cxx11::path::_Cmpt,
std::allocator<std::filesystem::__cxx11::path::_Cmpt> >::~vector
(this=0x7fffffffe310, __in_chrg=<optimised out>)
at /usr/include/c++/8/bits/stl_vector.h:567
#8 0x0000555555556314 in std::filesystem::__cxx11::path::~path
(this=0x7fffffffe2f0, __in_chrg=<optimised out>)
at /usr/include/c++/8/bits/fs_path.h:208
#9 0x0000555555556230 in main () at testpath.cpp:5
(gdb) quit
A debugging session is active.
Inferior 1 [process 2414] will be killed.
Quit anyway? (y or n) y
** Affects: gcc-8 (Ubuntu)
Importance: Undecided
Status: New
** Package changed: gcc-7 (Ubuntu) => gcc-8 (Ubuntu)
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https://bugs.launchpad.net/bugs/1824721
Title:
g++-8 in disco is broken with libstdc++6 from gcc9 and libstdc++fs
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