[llvm] [DebugInfo] Add clang flag to enable function-level debug line attribution (PR #93985)

[Paul T Robinson via llvm-commits]

pogo59 wrote:

> Currently, Clang generates function line information in the debug_line section without directly linking the line entries to their originating functions.

If you compile with -ffunction-sections, then there won't be any sequences in the line table that cross function boundaries. There will always be a DW_LNE_set_address opcode that points back to the start of the function. This pointer is in the opposite direction to what you are looking for, so it requires a bit more analysis to associate sequences with subprograms, but the information is there. Is that sufficient?

https://github.com/llvm/llvm-project/pull/93985