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[Bug gas/29451] gas-2.39 started adding 0-sized DIEs to functions withou

From: mark at klomp dot org
Subject: [Bug gas/29451] gas-2.39 started adding 0-sized DIEs to functions without .size
Date: Mon, 08 Aug 2022 19:27:54 +0000


--- Comment #5 from Mark Wielaard <mark at klomp dot org> ---
>> So when this file is linked in with object files and these relocations are
>> resolved the correct values for the __x86.get_pc_thunk.bx symbol will be
>> installed into the .debug_info section, and everything should work.
> In https://sourceware.org/PR29450 we observed zero-size on a final executable.

Maybe it is useful to attach the final binary to this bug and show how to
generate it.

Given the code that introduced this issues (commit
591cc9fbbfd6d51131c0f1d4a92e7893edcc7a28 see comment #1) it might also be
interesting to show the symbol table entry for _init.

Also maybe try building with -gdwarf-4 or -gdwarf-5 to see what/how high_pc is
encoded then (as offset from low_pc).

> These are DW_AT_low_pc=_init, DW_AT_high_pc=_init. AFAIU DW_AT_high_pc
> should be somehting like _init+2 to at least account for `ud2`.

Right, the DW_AT_high_pc should at least be one bigger than low_pc or it
doesn't encode a valid single range.

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