Linking libc++ to CMake project on Linux

The "proper" way to do this in CMake at the moment, until a specific base feature is added to switch standard libraries that is, is to use a toolchain file.

In that toolchain file you specify the compiler etc similarly to the other answers here.

BUT what's great about toolchains is they can be swapped out quickly either on the commandline (using -DCMAKE_TOOLCHAIN_FILE=path/to/file) OR in VSCode with CMakeTools extension installed, and probably other editors too.

But having to hand code your own toolchain files is yet another obscure chore! No fun!

Luckily, I stumbled upon this github that maintains a suite of them so you don't have to write them from scratch! Should be a lot less likely to get them wrong.

https://github.com/ruslo/polly

Don't forget to set the compiler to clang++:

set(CMAKE_CXX_COMPILER "clang++")

Also, purge the cmake generated files (delete the folder CMakeFiles and CMakeCache.txt).

Depending on your system, it might also help to set

set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -lc++abi")