[llvm-dev] [ELF] Symbol-ordering-file warnings

[Rui Ueyama via llvm-dev]

On Mon, Jan 22, 2018 at 2:00 AM, James Henderson via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
>
>
>
> In our proprietary linker, we have a switch which has essentially
> identical functionality to the --symbol-ordering-file LLD switch. One of
> the main areas that it differs in is that our linker warns in various
> circumstances, if there is a problem with the contents of the order file.
> We would like to propose adding these same warnings to LLD, if there is
> interest in them. Following are the situations we warn in, and some of the
> justifications behind them:
>
>
>
> When a symbol in the order file is not found - might help catch typos in
> that file.
>
> Imported/undefined symbols - symbols in other modules clearly can’t be
> reordered in the current link.
>
> Absolute symbols - these do not have a position in the file, so ordering
> them makes no sense.
>
> Removed symbols (i.e. via --gc-sections) - it doesn’t make much sense to
> try to order such symbols, since they have no position in the output.
>

All sound good to me, and these features will be pretty useful.


>
> Would people be interested in these warnings?
>
>
>
> Regards,
>
>
>
> James
>
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>
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