Issues
Visual C++ ships with different versions of C Runtime libraries. This means the user can compile their code with any of the available libraries. However this can cause some problems when using different components (DLLs, EXEs) in the same program. A typical example is a program using different libraries. The user should use the same C Run-Time for all the program's components unless the implications are understood. Microsoft recommends using the multithreaded, dynamic link library (/MD or /MDd compiler option) to avoid possible problems.
Although the product originated as an IDE for the C programming language, the compiler's support for that language conforms only to the outdated original edition of the C standard, dating from 1989. The later revisions of the standard, C99 and C11, are still not supported at all. According to Herb Sutter, the C compiler is only included for "historical reasons" and is not planned to be further developed. Users are advised to either use only the subset of the C language that is also valid C++, and then use the C++ compiler to compile their code, or to just use a different compiler such as Intel C++ Compiler or the GNU Compiler Collection instead.
Support for 80-bit IEEE extended precision floating point math was dropped for IA32 and x86-64 editions. The long double type is now a synonym for the double type.
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