Bug 24623 – Rename version CppRuntime_Clang/Gcc to CppRuntime_libcxx/libstdcxx.

There is unfortunately an error in druntime CppRuntime version naming. I think this arises from the wrong assumption that libstdc++ is bound to GCC and libc++ to clang. This is not the case. For those in the know, it is actually very confusing to read CppRuntime_Clang in the code. "What is that?!" Clang works with both libstdc++ and libc++ and it very much depends on the OS/installation/user which library is actually used. I had to find this bit in d_do_test.d to learn what it stands for: version (CppRuntime_Gcc) envData.cxxCompatFlags = " -L-lstdc++ -L--no-demangle"; else version (CppRuntime_Clang) envData.cxxCompatFlags = " -L-lc++ -L--no-demangle"; Ah, ok, so CppRuntime_Clang stands for libc++. Please, please rename CppRuntime_Gcc => CppRuntime_libstdcpp CppRuntime_Clang => CppRuntime_libcpp The -target option should be fixed similarly.

@JohanEngelen updated dlang/dmd pull request #16610 "Rename CppRuntime_Clang/Gcc to CppRuntime_libcpp/libstdcpp https://issues.dlang.org/show_bug.cgi?id=24546 ." fixing this issue: - Rename CppRuntime_Clang/Gcc to CppRuntime_libcpp/libstdcpp. Add libcpp and libstdcpp -target= option recognition. Fix bugzilla 24623 https://issues.dlang.org/show_bug.cgi?id=24623 https://github.com/dlang/dmd/pull/16610

dlang/dmd pull request #16610 "Rename CppRuntime_Clang/Gcc to CppRuntime_libcpp/libstdcpp." was merged into master: - 349b493810d9fe6f1997df93d23194589f170584 by Johan Engelen: Fix bugzilla issue 24623: Rename CppRuntime_Clang/Gcc to CppRuntime_libcpp/libstdcpp. Add libcpp and libstdcpp -target= option recognition. https://github.com/dlang/dmd/pull/16610

libcpp is the GCC C PreProcessing library). libstdc++v3 refers to itself as (lib)stdcxx in code. libc++ similarly. Changed title of bug report: cpp --> cxx

dlang/dmd pull request #16613 "Fix bugzilla issue 24623 followup." was merged into master: - 988f31a2767417c4ccb595fce493835baa121e10 by Johan Engelen: Fix bugzilla issue 24623 followup. Rename CppRuntime to _LLVM and _GNU Also accept c++ for cxx in target string. https://github.com/dlang/dmd/pull/16613