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

[Magnus Ihse Bursie]

On Fri, 8 Apr 2022 14:10:05 GMT, Maxim Kartashev <duke at openjdk.java.net> wrote:

>> Andrew Leonard has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Trigger checks
>
> I did some experiments both with `gcc` and `clang`. Both respect the `.file` directive and put into the resulting ELF whatever was written after that keyword, so no path mapping is necessary. However, debug information suffers because `gcc` puts the exact same string into DWARF that debuggers need, so writing
> 
> .file "linux_x86_64.S"
> 
> gives you `DW_AT_NAME("linux_x86_64.S")`, which is not very useful (BTW, `clang` accurately points to the absolute path name of the source file) . So you have to use the relative path name there:
> 
> .file "src/hotspot/os_cpu/linux_x86/linux_x86_64.S"

@mkartashev Why don't you try building with clang as two different users, in two different directories, and see if the build is non-reproducible without this patch, but is reproducible with it (incl. your suggested change to include clang as well)?

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