As useful as I find C++, some of the above is not right.
There is no standard ABI for C++. G++ (in different versions) has two in common use, with a third coming soon; MSVC++ has others. (Other compilers tend to copy one or other of Gcc's or MSVC++'s, depending on target.) What is different now is that people have learned to include version numbers in the names of library files and library packages, so one rarely tries to link to a library built with the wrong compiler.
C++ code can be substantially faster than the best macro-obscurified C code, even without fancy template tricks. The reason is, believe it or don't, exceptions. Checking return status codes at each level in C (besides obscuring code logic!) is slower than leaving the stack to be unwound by compiler-generated code in the (unlikely) case of an exception.
Shitty programmers are more likely to code in C++ not because they're drawn to it, particularly, but because C++ is what everybody uses in Windows-land, and that's where most of them come from. That could be taken as a slight on typical Windows development habits, but it's really more a matter of the law of big numbers.
The only valid reason to consider C++ unsuitable for some particular "low-level" application is if the environment it must be linked/loaded into was built with a C compiler, and lacks the minimal support needed for, e.g., exception handling. An example is the Linux kernel. There's no reason Linux couldn't all be compiled and linked with G++ -- modulo some undisciplined use of C++ keywords as identifiers -- and then C++ drivers would be fine. However, it would be unwise to throw an exception in many contexts there.
Finally, the instability introduced in Gcc-4.x has a lot more to do with the optimizer than with changes to C++ or its implementation. That instability affected C programs (including the Linux kernel) as much as C++ programs.
None of these affect the conclusion, of course.
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