[llvm-bugs] [Bug 25407] New: Add a dedicated Standard C++ Library vendor macro string

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25407

            Bug ID: 25407
           Summary: Add a dedicated Standard C++ Library vendor macro
                    string
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: m-w4 at gmx.de
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Unlike other compilers, Clang supports various Standard C++ Libraries. It is
extremely difficult to determine from inside a program code which library from
which vendor in which version is actually used. Currently that is somewhat
feature-based. The problem emerges in particular on windows having gcc, clang's
libc++ and msvc, but also on linux having gcc and clang.
It would be most helpful to have a dedicated predefined macro string indicating
the vendor and the compiler/library version of that vendor. As an example,
clang could provide a __LIBCXX_VENDOR="GCC" and
__LIBCXX_VENDOR_VERSION="4.8.3", or accordingly __LIBCXX_VENDOR="CLANG" with
__LIBCXX_VENDOR_VERSION="3.7.0" etc. Such definitions would simplify the
identification of known peculiarities between the different implementations in
a program code, in particular for C++14 and newer features.

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