From e7a49fc4721950e35d99a3923846a8fe7d07947f Mon Sep 17 00:00:00 2001
From: Kevin Minehart <5140827+kminehart@users.noreply.github.com>
Date: Fri, 24 Oct 2025 11:23:14 +0200
Subject: [PATCH] CI: Windows builds with CGO cross-compiler toolchain
 (#112922)

* CI: Windows builds with CGO cross-compiler toolchain

* fix comments
---
 pkg/build/daggerbuild/backend/builder.go      |  8 +++++---
 .../daggerbuild/backend/distributions.go      | 20 +++++++++++++++++--
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/pkg/build/daggerbuild/backend/builder.go b/pkg/build/daggerbuild/backend/builder.go
index 017f5a1ba04..b1e02ee6b82 100644
--- a/pkg/build/daggerbuild/backend/builder.go
+++ b/pkg/build/daggerbuild/backend/builder.go
@@ -105,8 +105,8 @@ func GolangContainer(
 	opts *BuildOpts,
 ) (*dagger.Container, error) {
 	os, _ := OSAndArch(distro)
-	// Only use viceroy for all darwin and only windows/amd64
-	if opts.CGOEnabled && (os == "darwin" || distro == DistWindowsAMD64) {
+	// Only use viceroy for all darwin builds
+	if opts.CGOEnabled && os == "darwin" {
 		return ViceroyContainer(d, log, distro, goVersion, viceroyVersion, opts)
 	}
 
@@ -125,7 +125,9 @@ func GolangContainer(
 			WithExec([]string{"wget", "-q", "https://dl.grafana.com/ci/s390x-linux-musl-cross.tgz", "-P", "/toolchain"}).
 			WithExec([]string{"tar", "-xf", "/toolchain/s390x-linux-musl-cross.tgz", "-C", "/toolchain"}).
 			WithExec([]string{"wget", "-q", "https://dl.grafana.com/ci/riscv64-linux-musl-cross.tgz", "-P", "/toolchain"}).
-			WithExec([]string{"tar", "-xf", "/toolchain/riscv64-linux-musl-cross.tgz", "-C", "/toolchain"})
+			WithExec([]string{"tar", "-xf", "/toolchain/riscv64-linux-musl-cross.tgz", "-C", "/toolchain"}).
+			WithExec([]string{"wget", "-q", "https://dl.grafana.com/ci/x86_64-w64-mingw32-cross.tgz", "-P", "/toolchain"}).
+			WithExec([]string{"tar", "-xf", "/toolchain/x86_64-w64-mingw32-cross.tgz", "-C", "/toolchain"})
 	}
 	return WithGoEnv(log, container, distro, opts)
 }
diff --git a/pkg/build/daggerbuild/backend/distributions.go b/pkg/build/daggerbuild/backend/distributions.go
index 8f34f4e2496..cc7c319fc5a 100644
--- a/pkg/build/daggerbuild/backend/distributions.go
+++ b/pkg/build/daggerbuild/backend/distributions.go
@@ -264,7 +264,7 @@ func BuildOptsStaticS390X(distro Distribution, experiments []string, tags []stri
 	}
 }
 
-// BuildOptsStaticS390X builds Grafana statically for the s390x arch
+// BuildOptsStaticRiscv64 builds Grafana statically for the riscv64 arch
 func BuildOptsStaticRiscv64(distro Distribution, experiments []string, tags []string) *GoBuildOpts {
 	var (
 		os, _ = OSAndArch(distro)
@@ -280,6 +280,22 @@ func BuildOptsStaticRiscv64(distro Distribution, experiments []string, tags []st
 	}
 }
 
+// BuildOptsStaticWindows builds Grafana statically for Windows on amd64
+func BuildOptsStaticWindows(distro Distribution, experiments []string, tags []string) *GoBuildOpts {
+	var (
+		os, _ = OSAndArch(distro)
+	)
+
+	return &GoBuildOpts{
+		CC:                "/toolchain/x86_64-w64-mingw32-cross/bin/x86_64-w64-mingw32-gcc",
+		CXX:               "/toolchain/x86_64-w64-mingw32-cross/bin/x86_64-w64-mingw32-cpp",
+		ExperimentalFlags: experiments,
+		OS:                os,
+		Arch:              "amd64",
+		CGOEnabled:        true,
+	}
+}
+
 func StdZigBuildOpts(distro Distribution, experiments []string, tags []string) *GoBuildOpts {
 	var (
 		os, arch = OSAndArch(distro)
@@ -364,7 +380,7 @@ var DistributionGoOpts = map[Distribution]DistroBuildOptsFunc{
 
 	// Non-Linux distros can have whatever they want in CC and CXX; it'll get overridden
 	// but it's probably not best to rely on that.
-	DistWindowsAMD64: ViceroyBuildOpts,
+	DistWindowsAMD64: BuildOptsStaticWindows,
 	DistWindowsARM64: StdZigBuildOpts,
 	DistDarwinAMD64:  ViceroyBuildOpts,
 	DistDarwinARM64:  ViceroyBuildOpts,