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

[Andrew Leonard]

On Fri, 8 Apr 2022 09:30:51 GMT, Andrew Leonard <aleonard at openjdk.org> wrote:

>> Actually, I think that the GNU assembler supports debug prefix mapping. See e.g. [this bug report](https://github.com/ocaml/ocaml/issues/10770), stating: "With GNU tools, to enable debug prefix map on C source we pass -fdebug-prefix-map to cc and --debug-prefix-map to as."
>> 
>> @andrew-m-leonard Can you check if we can pass `--debug-prefix-map` to the assembler if on the gcc toolchain, and thus get rid of the relative linking? (And oh, speaking of that, the if statement here checks for target OS. It should, most likely, have checked for toolchain.)
>
> @magicus just saw your above post, interesting, i'll add I think gcc -v to my above testing, to see what gcc is passing through to the actual compile, apparently using verbose removes anything that gets removed for assembly, ie.anything that is not relavent

I did test with --debug-prefix-map on the assembly cmdline, it just seemed to be ignored, but I will try again

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