[Bug libstdc++/90612] New: std::filesystem::path crash

[terra at gnome dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90612

            Bug ID: 90612
           Summary: std::filesystem::path crash
           Product: gcc
           Version: 9.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: terra at gnome dot org
  Target Milestone: ---

Created attachment 46404
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46404&action=edit
Preprocessed source code

# /usr/local/products/gcc/9.1.0/bin/g++ -std=gnu++2a
-Wl,-rpath,/usr/local/products/gcc/9.1.0/lib64 -lstdc++fs short_fail.C
# ./a.out 
Segmentation fault (core dumped)

# /usr/local/products/gcc/9.1.0/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/usr/local/products/gcc/9.1.0/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/products/gcc/9.1.0/lib/gcc/x86_64-suse-linux/9.1.0/lto-wrapper
Target: x86_64-suse-linux
Configured with: ../../gcc-9.1.0/configure --enable-languages=c,c++,fortran
--enable-targets=x86_64-suse-linux,i686-suse-linux
--prefix=/usr/local/products/gcc/9.1.0 --with-gnu-as
--with-as=/usr/local/products/gcc/binutils-2.32/bin/as --with-gnu-ld
--with-ld=/usr/local/products/gcc/binutils-2.32/bin/ld --enable-threads=posix
--enable-shared --enable-__cxa_atexit --enable-libstdcxx-allocator=pool
x86_64-suse-linux
Thread model: posix
gcc version 9.1.0 (GCC) 



# cat short_fail.C
#include <filesystem>
#include <vector>

namespace fs = std::filesystem;

struct ChainStruct {
  std::vector<fs::path> directories;
};

struct Foo {
  void reset();
  void set(std::filesystem::path const &baz);
  std::filesystem::path baz;
};


void Foo::reset() {
  char const *bar = "/aaa/aaaaa/aaaaaa/aaaa";
  std::filesystem::path baz(bar);
  set(std::filesystem::path(bar));
}

void Foo::set(std::filesystem::path const &baz) {
  this->baz = baz;
}


void moo() {
  ChainStruct oink;
  oink.directories.emplace_back("/aaaa/aaa/aaaaaaa/aaa");
  oink.directories.emplace_back("/aaaa/aaa/aaaaaaa/aaa");
  oink.directories.emplace_back("/aaaa/aaa/aaaaaaa/aaa");
  oink.directories.emplace_back("/aaaa/aaa/aaaaaaa/aaa");
}



int main() {
  Foo foo;
  foo.set("/aaaaaaa/aaaa/aaaaa/aaaaaaaaaaaaaaaaaaa/aaaaaaaaaaaaaaaaaaa");
  foo.reset();
  foo.set("/aaaaaaa/aaaa/aaaaa/aaaaaaaaaaaaaaaaaaa/aaaaaaaaaaaaaaaaaaa");
  foo.reset();
  moo();
  return 0;
}