Enabled source-building with mono runtime on any architecture.

[tmds]

Adds an argument to the top-level build script to use the mono runtime, and sets the flags needed for the different repos to work with mono.

This fixes dotnet/source-build#3076 and also enables building .NET on any architectures (including x64, and arm64) with mono runtime.

@crummel @MichaelSimons ptal

cc @uweigand @omajid @janani66

[MichaelSimons]

These changes are too late for GA. I would be supportive of taking them in 7.0 servicing if the patches are backported/signed off by the product teams.

[omajid]

I can confirm this fixes source-build for me on s390x and ppc64le.

[tmds]

I've synced the sdk patch with dotnet/sdk#28674, and it now prints an informative error message to the user the feature is not supported.

These changes are too late for GA. I would be supportive of taking them in 7.0 servicing if the patches are backported/signed off by the product teams.

We need these patches for the mono-based builds. We can apply them ourselves if they are not included.

Others will be interested in having them also, like for Alpine (dotnet/source-build#3020). cc @ayakael

[ayakael]

I'd also have armv6 be considered for mono build as well, as it is supported only on that backend.

[tmds]

I'll re-target this PR to main, and create PRs for the patches at the end of this week.

Like with PR that eliminates portable runtime, we can request backports once installer main is working.

[crummel]

This looks good to me so far, I'll check back in after the retargeting. Thanks Tom!

[tmds]

I've removed the patches. These are the PRs:

• Make PublishAot an optional feature because Mono does not support it. sdk#28674
• source-build: don't use crossgen when building for mono runtime. aspnetcore#44842
• source-build: set the properties to build for mono runtime. runtime#77786

[tmds]

Close/Open to re-trigger CI.

[MichaelSimons]

LGTM w/one minor comment.

[MichaelSimons]

Please alphabetize.

[tmds]

Update on 7.0 backports:

• sdk: to be merged: Make PublishAot an optional feature because Mono does not support it. sdk#28674
• runtime: to be merged: [release/7.0] source build backports runtime#78395
• installer: to be backported: Enabled source-building with mono runtime on any architecture. #14792

[tmds]

The sdk PR got the 7.0.3 milestone yesterday.

We need to backport this PR to 7.0 too to complete the feature.

cc @crummel @MichaelSimons

[MichaelSimons]

@tmds - I'm not making the connection on what needs to be backported. The 7.0.3 milestone includes the 7.0.103 SDK.

[tmds]

This PR (#14792) should be backported to 7.0.

[MichaelSimons]

This PR (#14792) should be backported to 7.0.

But it looks like this PR was merged into release/7.0.1xx. What am I missing?

[tmds]

Oops, I thought this PR was targeting main. 😅