[PATCH] D59553: [LLD][ELF][DebugInfo] llvm-symbolizer shows incorrect source line info if --gc-sections used

[bd1976 llvm via llvm-commits]

On Thu, Mar 21, 2019 at 9:20 PM Eric Christopher via Phabricator <
reviews at reviews.llvm.org> wrote:

> echristo added a comment.
>
> Oh, and as far as dwarf aware linking I'd arguably prefer a separate tool
> ala dsymutil or dwz rather than incorporating it into the linker. I do
> agree that such a tool is incredibly useful and should be part of our
> ongoing development plan around debug info.
>
>
dwz looks great. I was unaware that it existed. Thanks!

Is GNU compatibility an issue? I did some research on this a while ago:

GOLD:
Stripping (gc-sections):
.debug_info   - patch low pc to 0
.debug_ranges - patch low address to 0 and high address to "size of
function + 1".

Deduplication (icf):
.debug_info   - patch low pc to the address of the chosen function
.debug_ranges - patch the start and end addresses to the start and end
addresses of the chosen
function

COMDATs:
.debug_info   - patch low pc to 0
.debug_ranges - patch the start and end addresses to the start and end
addresses of the chosen
function

GNU LD:
Stripping (gc-sections):
.debug_info   - patch low pc to 0
.debug_ranges - patch the low and high address to 1 to make a size 0 range.

Deduplication (icf):
.debug_info   - N/A
.debug_ranges - N/A

COMDATs:
.debug_info   - patch low pc to 0
.debug_ranges - patch the start and end addresses to the start and end
addresses of the chosen
function

 What does GDB make of -1/-2???


> CHANGES SINCE LAST ACTION
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> https://reviews.llvm.org/D59553
>
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