Simple failing C++/CX example

Author: kyle-foreflight

.bazelrc

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+build --verbose_failures

.bazelversion

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+3.1.0

.gitignore

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+bazel-*
+*.sublime-project
+*.sublime-workspace

BUILD

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+cc_library(
+    name = "cppcx_example",
+    srcs = ["Example.cpp",],
+    copts = [
+        "/std:c++17",
+        "/ZW",
+        # "/AI \"C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Professional\\VC\\Tools\\MSVC\\14.25.28610\\lib\\x86\\store\\references\"",
+        # "/AI \"C:\\Program Files (x86)\\Windows Kits\\10\\unionmetadata\\10.0.18362.0\"",
+    ],
+)

Example.cpp

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+#include <memory>
+
+namespace cppcx_example {
+
+public ref class Foo sealed {
+public:
+    Foo() { }
+    property Platform::IBox<double>^ Bar;
+};
+
+}

README.md

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+Example of failing Bazel build with C++/CX enabled.
+
+Run `build_simple.cmd` to see first error, which suggests setting
+`LIBPATH` to help find the .winmd files needed or using \AI flags.
+
+Run `build_vcvarsall_libpath.cmd` to see error after getting `LIBPATH` set
+appropriately by calling `vcvarsall.bat` and passing 
+`action_env=LIBPATH`. May need to tweek this script
+to match the location of `vcvarsall.bat` on your system.

WORKSPACE

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+bazel build :cppcx_example

build_simple.cmd

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+call "C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Professional\\VC\\Auxiliary\\Build\\vcvarsall.bat" x64 uwp
+
+bazel build :cppcx_example --action_env=LIBPATH