[fuwafuwa]

ABI compatibility: Not really solved in C++ - see MSVC versus Mingw. If you're coming from the standpoint of using a Linux distro or BSD you enjoy a sanitized environment from the start.

Multi-platform support: Pray that your project's build system makes it straightforward to get all the dependencies going on every platform. Pray that your dependencies are easy to access and of the correct version. Pray that the manufacturer's fork of an ancient gcc isn't too buggy to use. C made it possible, not easy.

Tools: Both languages are too impoverished to have tooling as comprehensive as the stuff available in, for example, Java, although VS pushes very hard on this front. rustc already gives better error messages than any C++ compiler.

Code base: See the build system problem. Maintaining open source projects in C and C++ is an exercise in endurance. Single header file libraries have come into vogue as a result - and they're a hack. There is a lot of decent code in both languages not being used because it's hard to get running.

Community: Rust is in a better position here in part because it's smaller. If I encounter a C++ hacker in an online space it's just as likely to be an aggro kid as a seasoned pro.

[faragon]

My point was explicitly about C, not C++. All these points are solved in C, decades ago.