Build .NET Core 9 under FreeBSD

2025

for cross build sdk, patch needed for runtime to output proper ilc - https://patch-diff.githubusercontent.com/raw/dotnet/runtime/pull/105004.patch
also this one might be needed https://github.com/dotnet/runtime/pull/105587.patch
if sdk will fail with missing runtime, extract freshly built runtime from artifacts into sdk/.dotnet dir

aspnet runtime nuget with 6.0.32
app host both runtime and aspnet with 6.0.32
I use some old v6 versions and repack them with new version, scripts in repo, maybe there's better way for that
eng/Versions.props, line 217 with MicrosoftDotNetILCompilerVersion, put 9.0.0-preview.7.24405.7 or the one you have with SDK
add nuget source for SDK nuget's your compile with
adjust global.json versions to SDK version
for runtime, app host error could happen - this need sed linux-arch to freebsd-arc - ex. sed -i '' -e 's/linux-arm64/freebsd-arm64/g' runtime/.dotnet/sdk/9.0.100-preview.7.24407.12/Microsoft.NETCoreSdk.BundledVersions.props
add <NuGetAudit>false</NuGetAudit> into aspnetcore/Directory.Build.props
remove dnc/internal nuget feeds might also help

build runtime (ILC can/will fail due to missing symbols, copy from crossbuild, but final SDK/nuget will also be broken)
build aspnet (do not build with node/npm installed)
build sdk

We how have community made port under FreeBSD ports for x64/amd64 and aarch64
/usr/ports/lang/dotnet/make install or pkg install will get you up and running
to speed up port build, use install_tools.sh first, unless you like everything from source

Just a collection of script and patches put up into one place, to help getting automated builds.
For other versions, check proper tag with that name (mostly out-dated and not updated).
For my private nuget feed, check dotnet-freebsd-nuget-feed

Run as root install_tools.sh - make sure to mount all needed things (add them to /etc/fstab, then mount -a)
init.sh
build_runtime.sh - add -v d inside if it will fail with SEHExceptions...
build_aspnetcore.sh
build_installer.sh - this one can fail with downloaing some things, copy URL and try to manualy fetch it into installer/artifacts/obj/redist/Release/downloads/
Check installer/artifacts/packages/Release/Shipping/ or
gather_output.sh will create one archive with everything you should need on target system
clean.sh if you want to save disk space after use

some steps can fail, some patches can fail to apply, mostly due to numbers, this needs to be handed by hand, as I don't update all the patches with every release
sometime some step can fail, due to zombie dotnet processes left, simple killall -9 dotnet will do the trick
when building under jail, mlock is required

Working SDK for FreeBSD
Tested under FreeBSD 13 and 14
8GB+ of RAM recommended (with 4GB I saw some parts crashing)
To run SDK and/or apps pkg install libunwind icu libinotify should be enough on another box, maybe openssl too
Under 14 also pkg install misc/compat13x might be needed if using builds directly