Linux Player: Apps based on Unity 2018.3.0f2 crashe on "std::getline()" from C/C++ native code.

After we updated our SDK to new Unity version 2018.3.0f2 we have found crashing all applications which were always working before.
After debuging we found crashes in native C/C++ plugins if they use:

Code (CSharp):

1. std::getline(input, line);

This affects all Unity applications built with 2018.3.0f2.
So I tried to replicate it on a simple sample, see below.

Target platform is Linux Ubuntu x64 build:
System information:

• g++ (Ubuntu 5.4.1-8ubuntu1) 5.4.1 20170304
  
• clang version 4.0.0 (tags/RELEASE_400/rc1)
  Target: x86_64-pc-linux-gnu
  Thread model: posix

How to replicate? Build a simple native plugin:
1. Create sample file "vi test.cpp"

Code (CSharp):

1. #include <memory.h>
2. #include <string>
3. #include <stdio.h>
4. #include <sstream>
5. #include <iostream>
6.  
7. extern "C" void L7_GetDeviceModel(char* buffer) {
8.     std::istringstream input;
9.     input.str("1\n2\n3\n4\n5\n6\n7\n");
10.     std::string line;
11.     std::getline(input, line);
12.     strcpy(buffer, line.c_str());
13. }

2. How we built:

1. sudo g++ -std=c++11 -g -fPIC -o libunitywrapper.so -shared test.cpp
2. sudo clang++-4.0 -g -fPIC -o libunitywrapper.so -shared test.cpp
3. sudo g++ -g -fPIC -o libunitywrapper.so -shared test.cpp
4. sudo g++ -std=gnu++11 -g -fPIC -o libunitywrapper.so -shared test.cpp

3. How we call in C#:

Code (CSharp):

1.             [DllImport("libunitywrapper", CallingConvention = CallingConvention.Cdecl)]
2.             internal static extern void L7_GetDeviceMake(
3.                 [MarshalAs(UnmanagedType.LPStr)] StringBuilder buffer);

You can see full stacktrace in the uploaded log:
Important part there:

Code (CSharp):

1. #8  0x00007f6ff0bbe579 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
2. #9  0x00007f6ff0be7fe2 in std::__throw_bad_cast() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
3. #10 0x00007f6ff0be16a1 in std::basic_istream<char, std::char_traits<char> >& std::getline<char, std::char_traits<char>, std::allocator<char> >(std::basic_istream<char, std::char_traits<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
4. #11 0x00007f6fc8c81f01 in L7_GetDeviceModel (buffer=0x3fb7580 "") at test.cpp:12

Error:

Code (CSharp):

1. terminate called after throwing an instance of 'std::bad_cast'
2.   what():  std::bad_cast

This bug affects the compatibility of all applications we want to build on Unity 2018.3.0f2.
Any ideas why it happens? Is that compiler version or C++ language standard?

Thank you.

 

Uploaded log with native stacktrace:

 

I am adding here source files who want to easy replicate issue:
C# and CPP plugin file.

 

Hey marcdi_unity,
sorry for late answer. Thank you for the fix. All is working for now since 2018.3.4.