Linker for cxsnippets

[jj683]

Which linker should be used in check_cxsnippet if you using custom toolchain?
For example, with custom clang-18 toolchain with enabled LTO for test snippet of Catch2 library right now xmake using "ld" linker, which is different from "ld" env variable.

Debug log: https://gist.github.com/jj683/999b2705b3c0c36fec50d3b39751debc

[waruqi]

I don't know why just linking the test would enable lto, I have no more information.