[ci] x-compile macos with cgo using zig

Author: theRealWardo

ci/main.go

@@ -27,6 +27,10 @@ import (
 "dagger/apoxy-cli/internal/dagger"
 )
 
+// Note that 0.12.0 and later fail to cross compile for Darwin.
+// See https://github.com/ziglang/zig/issues/20689
+const ZigVersion = "0.11.0"
+
 type ApoxyCli struct{}
 
 func canonArchFromGoArch(goarch string) string {
@@ -75,18 +79,18 @@ func (m *ApoxyCli) BuilderContainer(ctx context.Context, src *dagger.Directory)
 WithMountedCache("/go/build-cache", dag.CacheVolume("go-build")).
 WithEnvVariable("GOCACHE", "/go/build-cache").
 // Install Zig toolchain.
-WithExec([]string{"apt-get", "update", "-yq"}).
+WithExec([]string{"apt-get", "update"}).
 WithExec([]string{
 "apt-get", "install", "-yq", "xz-utils", "clang",
 }).
 WithExec([]string{
-"wget", fmt.Sprintf("https://ziglang.org/download/0.13.0/zig-linux-%s-0.13.0.tar.xz", hostArch()),
+"wget", fmt.Sprintf("https://ziglang.org/download/%s/zig-linux-%s-%s.tar.xz", ZigVersion, hostArch(), ZigVersion),
 }).
 WithExec([]string{
-"tar", "-xf", fmt.Sprintf("zig-linux-%s-0.13.0.tar.xz", hostArch()),
+"tar", "-xf", fmt.Sprintf("zig-linux-%s-%s.tar.xz", hostArch(), ZigVersion),
 }).
 WithExec([]string{
-"ln", "-s", fmt.Sprintf("/zig-linux-%s-0.13.0/zig", hostArch()), "/bin/zig",
+"ln", "-s", fmt.Sprintf("/zig-linux-%s-%s/zig", hostArch(), ZigVersion), "/bin/zig",
 }).
 WithNewFile("/bin/zig-wrapper", zigWrapperScript, dagger.ContainerWithNewFileOpts{
 Permissions: 0755,
@@ -114,19 +118,44 @@ func (m *ApoxyCli) BuildCLI(
 fmt.Sprintf("-X '%s/build.BuildVersion=%s'", pkg, tag),
 fmt.Sprintf("-X '%s/build.BuildDate=%s'", pkg, date),
 fmt.Sprintf("-X '%s/build.CommitHash=%s'", pkg, sha),
-"-s", // strip symbols
 "-w", // disable DWARF
+// Before you think about adding -s here, see https://github.com/ziglang/zig/issues/22844
+}
+
+targetArch := canonArchFromGoArch(goarch)
+zigTarget := fmt.Sprintf("%s-linux-musl", targetArch)
+if os == "darwin" {
+zigTarget = fmt.Sprintf("%s-macos", targetArch)
 }
 
 builder := m.BuilderContainer(ctx, src)
+
+if os == "darwin" {
+builder = builder.
+WithExec([]string{ "apt-get", "update" }).
+WithExec([]string{ "apt-get", "install", "-yq", "gcc", "g++", "zlib1g-dev", "libmpc-dev", "libmpfr-dev", "libgmp-dev"}).
+WithExec([]string{
+"wget", fmt.Sprintf("https://apoxy-public-build-tools.s3.us-west-2.amazonaws.com/MacOSX14.sdk.tar.xz"),
+}).
+WithExec([]string{
+"tar", "-xf", "MacOSX14.sdk.tar.xz",
+}).
+WithExec([]string{
+"mv", "MacOSX14.sdk", "/macsdk",
+})
+}
+
 return builder.
 WithEnvVariable("GOARCH", goarch).
 WithEnvVariable("GOOS", os).
+WithEnvVariable("CGO_ENABLED", "1").
+WithEnvVariable("CC", fmt.Sprintf("zig-wrapper cc --target=%s --sysroot=/macsdk -I/macsdk/usr/include -L/macsdk/usr/lib -F/macsdk/System/Library/Frameworks -Wno-expansion-to-defined -Wno-availability -Wno-nullability-completeness -DZIG_STATIC_ZLIB=on", zigTarget)).
+WithEnvVariable("CXX", fmt.Sprintf("zig-wrapper c++ --target=%s --sysroot=/macsdk -I/macsdk/usr/include -L/macsdk/usr/lib -F/macsdk/System/Library/Frameworks -Wno-expansion-to-defined -Wno-availability -Wno-nullability-completeness -DZIG_STATIC_ZLIB=on", zigTarget)).
 WithMountedCache("/go/pkg/mod", dag.CacheVolume("go-mod-"+goarch)).
 WithEnvVariable("GOMODCACHE", "/go/pkg/mod").
 WithMountedCache("/go/build-cache", dag.CacheVolume("go-build-"+goarch)).
 WithEnvVariable("GOCACHE", "/go/build-cache").
-WithExec([]string{"go", "build", "-o", "/apoxy", "-ldflags", strings.Join(ldFlags, " "), "."})
+WithExec([]string{"go", "build", "-o", "/apoxy", "-ldflags", strings.Join(ldFlags, " "), "-tags", "netgo", "."})
 }
 
 // PublishGithubRelease publishes a CLI binary to GitHub releases.