Re: [edk2-devel] Current State of Build Reproducibility in edk2

["Michael D Kinney via groups.io" <michael.d.kinney=intel.com@groups.io>]

Should work for physical platform builds.

The OVMF and EmulatorPkg build may have some timestamps in them.

If the EmbeddedPkg VirtualRealTimeClockLib is used, then it pulls in system time 
in Linux builds.  I have a proposal to address this one queued up to support
both windows and linux and reproducible builds when needed.

[BuildOptions]
  GCC:*_*_*_CC_FLAGS = -DBUILD_EPOCH=`printenv SOURCE_DATE_EPOCH || date +%s`

The following is a good resource on this topic and all the
elements need to be tracked so issues do not get introduced.

	https://reproducible-builds.org/docs/

Mike

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Oliver
> Smith-Denny via groups.io
> Sent: Wednesday, June 18, 2025 12:45 PM
> To: devel@edk2.groups.io
> Subject: [edk2-devel] Current State of Build Reproducibility in edk2
> 
> Hi,
> 
> What is the current state of build reproducibility in edk2?
> I saw some mail threads about it awhile back and have looked
> at this
> https://tianocore-docs.github.io/edk2-BuildSpecification/release-
> 1.28/12_build_changes_and_customizations/126_build_reproducibility.html#
> 126-build-reproducibility,
> which seems to claim that you can just do a RELEASE build with
> MDEPKG_NDEBUG set and get binary compatible builds.
> 
> However, when attempting that with a clean OVMF IA32X64 VS2022 RELEASE
> build at the same commit (and rebuilt basetools), I am getting
> significantly different FDs and FVs. The driver files are almost
> identical except for what I am assuming is a build identifier or
> timestamp.
> 
> Are there any additional resources or thoughts towards complete binary
> reproducible builds?
> 
> Thanks,
> Oliver
> 
> 
> 
> 



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