http://blog.llvm.org/2011/05/what-every-c-programmer-should-...
http://blog.llvm.org/2011/05/what-every-c-programmer-should-...
http://blog.llvm.org/2011/05/what-every-c-programmer-should-...
Many equate "C == what my compiler does", but just like any standardized technology with holes open to implementers to decide upon, portability isn't as people think.
Implementing an effective compiler is another concern entirely, but I would still argue that there tend to be more incompatibilities between C++ implementations than C.
However many C++ incompatibilities are actually caused by C compatibility and the goal of having higher constructs that are copy paste compatible with C but with additional semantics, e.g. structs.
So in both cases, to achieve your portability goal the languages would have to be fully specified.
As a C/C++ user, I'm honestly still not sure why a number of C features have yet to be formalized in C++ (e.g. restrict).
Which C++17 feature are you referring to? Modules?
Filesystems, networking, concurrency, ....
Sadly databases died out apparently.
Some of the issues C++ had were:
- C compilers were still catching up with ANSI C89 and it was a mess
- C++ being in the process of becoming standardise was even worse. It was quite hard to find out what were the working common features between compiler vendors, specially in terms of semantics
- The C culture that prevented many nice frameworks to succeed, because they were too high level, hence why MFC is such a thin wrapper over Win32.
- Lack of standard ABI in an age people only shared binary libraries.
C++14 and C++17 look really nice, but I doubt C++ will recover its place at the enterprise, beyond performance critical libraries/modules.
UNIX was seen as the C runtime. When the standard came ANSI C adopted what was considered the minimum portable bits one could use in non UNIX systems.
Then came POSIX, which isn't as portable as many think. It also enjoys some of the UB and implementation specific behavior of the C world.
C++ while trying to cater to C developers adopted the same attitude.
Thankfully the C++ committee is changing that with C++17.