为了学习delete function definition，我尝试编译以下C ++程序，该程序将虚函数定义为delete，将另一个类定义为子类：
class V {
virtual void foo() = delete;
};
class C: V {
// Any valid definition of foo for Apple's clang++?
};
int main(int argc, char** argv) {
C c = C();
return 0;
}
但是，无论我如何在foo中定义C，此程序都无法编译。
$ /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -std=c++11 -Wc++11-extensions -v test_virtual.cpp
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.11.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name test_virtual.cpp -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu core2 -target-linker-version 274.2 -v -dwarf-column-info -debugger-tuning=lldb -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.0.0 -stdlib=libc++ -Wc++11-extensions -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /Users/suztomo/Documents/beringei/beringei -ferror-limit 19 -fmessage-length 140 -stack-protector 1 -fblocks -fobjc-runtime=macosx-10.11.0 -fencode-extended-block-signature -fcxx-exceptions -fexceptions -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -o /var/folders/q6/wnd9wfkj0_50wpwhvfyn0kmh0000gn/T/test_virtual-173a58.o -x c++ test_virtual.cpp
clang -cc1 version 8.0.0 (clang-800.0.42.1) default target x86_64-apple-darwin15.6.0
ignoring nonexistent directory "/usr/include/c++/v1"
#include "..." search starts here:
#include <...> search starts here:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1
/usr/local/include
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.0.0/include
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
/usr/include
/System/Library/Frameworks (framework directory)
/Library/Frameworks (framework directory)
End of search list.
"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld" -demangle -dynamic -arch x86_64 -macosx_version_min 10.11.0 -o a.out /var/folders/q6/wnd9wfkj0_50wpwhvfyn0kmh0000gn/T/test_virtual-173a58.o -lc++ -lSystem /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.0.0/lib/darwin/libclang_rt.osx.a
Undefined symbols for architecture x86_64:
"___cxa_deleted_virtual", referenced from:
vtable for C in test_virtual-173a58.o
vtable for V in test_virtual-173a58.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
foo中是否有C的有效定义，而不修改V，这适用于Apple的clang ++？或者我错过了任何命令行参数？
根据m8r-uyl6ds's post这个问题在Ubuntu中没有发生但是我没有其他机器而不是我的Mac OS X El Capitan 10.11.6。