aganea added a comment.

Thanks for getting back Hans!

In D63648#1589119 <https://reviews.llvm.org/D63648#1589119>, @hans wrote:

> Are you saying the diagnostics were not using absolute paths in those cases 
> and this patch fixes that?


Yes.

>> , or --show-includes, or -E
> 
> Those aren't diagnostics, so that's not surprising.

What would suggest in that case? Add a new `-fpreprocessor-absolute-paths` 
option? Or change the name of `-fdiagnostics-absolute-paths` for another name 
that applies to both diagnostics and the preprocessor output?

>> or displaying notes.
> 
> What notes?

That is, the additional output starting with `note:` issued along error 
messages: `t.cc:4:5: note: candidate function not viable: no known conversion 
from 'vector<map<[...], float>>' to 'vector<map<[...], double>>' for 1st 
argument;`
Sometimes, notes are displaying an extra path, sometimes it's just the note 
alone.

>> We have a peculiar use-case on our end with Fastbuild, where all this was 
>> exposed: CPP files are being are preprocessed on one PC, then compiled on 
>> another PC (which doesn't have the source-code); then the compiler's stdout 
>> is displayed on the first PC.
> 
> And what is the final problem? That diagnostics from the compiler's stdout 
> are not absolute because they came from the preprocessed code that doesn't 
> include the absolute paths?

Exactly. When clicking on a warning/error, those relative paths prevent Visual 
Studio from jumping to the right location.

Please let me know if further clarification is needed.


Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D63648/new/

https://reviews.llvm.org/D63648



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