I'm compiling C++ code in macOS 10.13 / 10.14 that makes use of features of std::filesystem that aren't normally available until macOS 10.15. As a result, I'm getting errors like this:
error: '~path' is unavailable: introduced in macOS 10.15
However, I'm linking against the static libraries of a custom-built, up-to-date version of libc++, and so these errors are irrelevant as the version of libc++ I'm using does indeed support these features, and will compile in versions of macOS prior to 10.15.
How do I disable those error messages? I'm certain there's a command line option that does it because I've used it before, but I can't for the life of me remember what it is!
As per documentation, you can use -nostdlib++ and -nostdinc++ to supress default stdlib include and linking paths:
% clang++ -nostdinc++ -nostdlib++ \
-isystem <install>/include/c++/v1 \
-L <install>/lib \
-Wl,-rpath,<install>/lib \
-lc++ \
test.cpp