fix(windows): enable plain cargo build on Windows MSVC

- Move `tikv-jemallocator` to `[target.'cfg(unix)'.dependencies]` so
  jemalloc is not compiled on Windows (its autoconf configure script
  does not work with MSVC).
- Add `#[cfg(unix)]` guards to the jemalloc global allocator blocks in
  src/lib.rs to match.
- Remove `rdkafka?/gssapi` from the `default` feature set; gssapi
  requires libsasl2 which is unavailable on Windows. Move it into
  `default-cmake` (Linux cmake builds) where the vendored sasl2 is
  already present.
- Add `rdkafka?/cmake_build` to `default` so librdkafka builds via
  cmake on all platforms (the release CI already does this via
  `default-msvc`/`default-cmake`).
- Gate `pub mod dnstap` on `#[cfg(all(unix, ...))]` in
  `src/sources/mod.rs` and `src/internal_events/mod.rs`. The dnstap
  source depends on the `framestream` module which was already
  unix-only; this makes the top-level declaration consistent and
  prevents compile errors on Windows.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: pront

Cargo.toml

@@ -435,7 +435,6 @@ sqlx = { version = "0.8.6", default-features = false, features = ["derive", "pos
 stream-cancel = { version = "0.8.2", default-features = false }
 strip-ansi-escapes = { version = "0.2.1", default-features = false }
 syslog = { version = "6.1.1", default-features = false, optional = true }
-tikv-jemallocator = { version = "0.6.0", default-features = false, features = ["unprefixed_malloc_on_supported_platforms"], optional = true }
 tokio-postgres = { version = "0.7.13", default-features = false, features = ["runtime", "with-chrono-0_4"], optional = true }
 tokio-tungstenite = { workspace = true, features = ["connect"], optional = true }
 toml.workspace = true
@@ -462,9 +461,11 @@ byteorder = "1.5.0"
 windows-service = "0.8.0"
 windows = { version = "0.58", features = ["Win32_System_EventLog", "Win32_Foundation", "Win32_System_Com", "Win32_Security", "Win32_Security_Authorization", "Win32_System_Threading", "Win32_Storage_FileSystem"], optional = true }
 quick-xml = { version = "0.31", default-features = false, features = ["serialize"], optional = true }
+rdkafka = { version = "0.39.0", default-features = false, features = ["cmake_build"], optional = true }
 
 [target.'cfg(unix)'.dependencies]
 nix = { version = "0.31", default-features = false, features = ["socket", "signal", "fs"] }
+tikv-jemallocator = { version = "0.6.0", default-features = false, features = ["unprefixed_malloc_on_supported_platforms"], optional = true }
 
 [target.'cfg(target_os = "linux")'.dependencies]
 procfs = { version = "0.18.0", default-features = false }

src/internal_events/mod.rs

@@ -40,7 +40,7 @@ mod datadog_traces;
 mod dedupe;
 #[cfg(feature = "sources-demo_logs")]
 mod demo_logs;
-#[cfg(feature = "sources-dnstap")]
+#[cfg(all(unix, feature = "sources-dnstap"))]
 mod dnstap;
 #[cfg(feature = "sources-docker_logs")]
 mod docker_logs;
@@ -194,7 +194,7 @@ pub(crate) use self::datadog_traces::*;
 pub(crate) use self::dedupe::*;
 #[cfg(feature = "sources-demo_logs")]
 pub(crate) use self::demo_logs::*;
-#[cfg(feature = "sources-dnstap")]
+#[cfg(all(unix, feature = "sources-dnstap"))]
 pub(crate) use self::dnstap::*;
 #[cfg(feature = "sources-docker_logs")]
 pub(crate) use self::docker_logs::*;

src/lib.rs

@@ -35,11 +35,11 @@ pub use indoc::indoc;
 // re-export codecs for convenience
 pub use vector_lib::codecs;
 
-#[cfg(all(feature = "tikv-jemallocator", not(feature = "allocation-tracing")))]
+#[cfg(all(unix, feature = "tikv-jemallocator", not(feature = "allocation-tracing")))]
 #[global_allocator]
 static ALLOC: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
 
-#[cfg(all(feature = "tikv-jemallocator", feature = "allocation-tracing"))]
+#[cfg(all(unix, feature = "tikv-jemallocator", feature = "allocation-tracing"))]
 #[global_allocator]
 static ALLOC: self::internal_telemetry::allocations::Allocator<tikv_jemallocator::Jemalloc> =
     self::internal_telemetry::allocations::get_grouped_tracing_allocator(

src/sources/mod.rs

@@ -17,7 +17,7 @@ pub mod aws_sqs;
 pub mod datadog_agent;
 #[cfg(feature = "sources-demo_logs")]
 pub mod demo_logs;
-#[cfg(feature = "sources-dnstap")]
+#[cfg(all(unix, feature = "sources-dnstap"))]
 pub mod dnstap;
 #[cfg(feature = "sources-docker_logs")]
 pub mod docker_logs;