Bug 37366 - Support reproducible builds
Summary: Support reproducible builds
Status: RESOLVED UPSTREAM
Alias: None
Product: Compilers
Classification: Mono
Component: VisualBasic ()
Version: unspecified
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Rolf Bjarne Kvinge [MSFT]
URL:
Depends on:
Blocks:
 
Reported: 2016-01-03 15:37 UTC by Jo Shields
Modified: 2018-05-22 12:28 UTC (History)
1 user (show)

Tags:
Is this bug a regression?: ---
Last known good build:

Notice (2018-05-24): bugzilla.xamarin.com is now in read-only mode.

Please join us on Visual Studio Developer Community and in the Xamarin and Mono organizations on GitHub to continue tracking issues. Bugzilla will remain available for reference in read-only mode. We will continue to work on open Bugzilla bugs, copy them to the new locations as needed for follow-up, and add the new items under Related Links.

Our sincere thanks to everyone who has contributed on this bug tracker over the years. Thanks also for your understanding as we make these adjustments and improvements for the future.


Please create a new report on GitHub or Developer Community with your current version information, steps to reproduce, and relevant error messages or log files if you are hitting an issue that looks similar to this resolved bug and you do not yet see a matching new report.

Related Links:
Status:
RESOLVED UPSTREAM

Description Jo Shields 2016-01-03 15:37:43 UTC
As of 26842, when Mono compiles C# code, it uses a zero timestamp, such that multiple repeated builds of the same code always are bit-identical. See https://wiki.debian.org/ReproducibleBuilds/About for background on why this is good.

The same does not apply to Mono's VB.NET compiler:

> directhex@bubblegum:/tmp$ vbnc hello.vb 2>&1 > /dev/null
> directhex@bubblegum:/tmp$ md5sum hello.exe 
> 3135b3a568302ef1f622772933d4c48b  hello.exe
> directhex@bubblegum:/tmp$ vbnc hello.vb 2>&1 > /dev/null
> directhex@bubblegum:/tmp$ md5sum hello.exe 
> 62b0193ee7fc1f5aca0d36bce999148a  hello.exe
> directhex@bubblegum:/tmp$ vbnc hello.vb 2>&1 > /dev/null
> directhex@bubblegum:/tmp$ md5sum hello.exe 
> 1c1d15aedb741dfe79e5cb195a3c6a9d  hello.exe
Comment 1 Rolf Bjarne Kvinge [MSFT] 2018-05-22 12:28:46 UTC
Moved to: https://github.com/mono/mono-basic/issues/39