C++17 introduced "inline variables", which is great for defining constants in header files, however you cannot rely on
the address of those constants to be stable across shared objects (components) if they have hidden linker visibility.
This repo is a simple demo of that issue, to test it out run make -f Makefile.clang && ./main on Linux, or on Windows
run make -f Makefile.msvc && ./main.exe from the Visual Studio command prompt. Windows only generates different
addresses for the global inline variable due to the way its linker attributes work (which are explicitly either
dllimport or dllexport, rather than hidden or default on Linux).
Sample output on Linux:
Addresses inside libfoo:
&Foo::kInlineVar = 0x7fabd420b004
&Foo:kNonInlineVar = 0x7fabd420b000
&kGlobalInlineVar = 0x7fabd420b06c
Addresses inside libbar:
&Foo::kInlineVar = 0x7fabd4206064
&Foo::kNonInlineVar = 0x7fabd420b000
&kGlobalInlineVar = 0x7fabd4206068