RFR: 8284437: Building from different users/workspace is not always deterministic [v2]

[Andrew Leonard]

On Fri, 8 Apr 2022 14:42:34 GMT, Andrew Leonard <aleonard at openjdk.org> wrote:

>> Andrew Leonard has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Trigger checks
>
> I am not sure why without the explicit .file directive that the FILE symbol in the ELF info contains an entry pointing to the .o object file, here's what it was before:
> 
>  31712: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS /home/andrew2/jdk/build/linux-aarch64-server-release/hotspot/variant-server/libjvm/objs/atomic_linux_aarch64.o
> 
> It's as if the lack of the .file has caused some tooling (linker?) to create this entry using the .o file path.

> @andrew-m-leonard
> 
> > So I am thinking adding a .file directive to the .S file specifying the "full source path" should do the trick thanks to -debug-prefix-map, I will do a test..
> 
> But then you'll end up with that absolute path name embedded into `STT_FILE` in the object file. It's best to use the relative path name _and_ employ path mapping.

@mkartashev of course yes it would make the .o non-reproducible, so yes makes sense "relative path name _and_ employ path mapping."

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PR: https://git.openjdk.java.net/jdk/pull/8124