The system linker strips debug info from the executable. The way the debugger finds debug info is that the debug info is available in the object files. A reference to the object files is added to the executable. The debugger can find the object files and read the debug info from the object files. I have no experience with Rust but in opinion this should be the default behavior for debug builds, no need to generate a dSYM file. The dSYM file is used if you want to ship debug info with your final release build to customers. There's no need for dSYM during regular development workflows.

It's possible to get the linker to keep the debug info by tweaking the section attributes. By default all debug info related sections have the `S_ATTR_DEBUG` flag. If that is replaced with the `S_REGULAR` flag the linker will keep those sections. The DMD D compiler does this for the `__debug_line` section [1][2][3]. This allows for uncaught exceptions to print a stack trace with filenames and line numbers. Of course, DMD uses a custom backend so this change was easy. Rust which relies on LLVM would probably need a fork.

[1] https://github.com/dlang/dmd/pull/8168 [2] https://github.com/dlang/dmd/blob/33406c205b76a8c2b5fb918da1... [3] https://github.com/dlang/dmd/blob/33406c205b76a8c2b5fb918da1...