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We aren't sure if this is really an issue yet but after discussing with Ankit and Marek it might be worth investigating. I have an assembly where I can reproduce a very small (4 byte) difference in the the generated .pdb file.
Steps to reproduce:
1) grab this project https://codeload.github.com/colbylwilliams/XWeather/zip/master
2) cd to the XWeather directory
3) restore nugets
4) run msbuild/xbuild (default targets)
I did this twice in two separate directory (one for xbuild and the msbuild) to ensure no artifacts left behind or anything.
I generated a diff of the two directories after the builds and discovered XWeather.UITests.pdb which has the minor size difference. Here you can see the directory diff: http://xqa.blob.core.windows.net/gist/Xweather-artifact-compare.zip-5311e0b6001f46288eecc823fb0e4ace.zip (just unzip and open Report.html)
Microsoft (R) Build Engine version 184.108.40.206 (xplat-2017-02/20b9fb5 Fri Apr 21 18:42:23 EDT 2017)
This can be reproduced regularly across various samples it seems. I see the same behavior in the following two samples:
Unfortunately this curious little difference in the .pdb file has not yet been investigated on the now-frozen 15.3 target milestone, so I will move the bug to the next upcoming milestone for an initial engineering review.
I cannot reproduce the issue locally with
Visual Studio Community 2017 for Mac (Preview)
Version 7.2 Preview (7.2 build 583)
Mono 220.127.116.11 (2017-06/1afb931de69) (64-bit)
Both msbuild and xbuild produce XWeather.UITests.pdb with the size of 2768. You need to use the same folder for the files as the path is encoded in the PDB file.
I think we can close this, the difference is likely due to the different path used as noted in comment 3