improve implementation

.cargo/config.toml

@@ -1,2 +1,11 @@
 [build]
-rustflags = ["-C", "target-feature=+crt-static"]
+rustflags = [
+  "-C",
+  "target-feature=+crt-static",
+
+  # Enable unstable cfg options:
+  # "--cfg", "wdk_build_unstable",
+
+  # Unstable cfg options:
+  # "--cfg", "skip_umdf_static_crt_check",
+]

Cargo.toml

@@ -41,6 +41,7 @@ bindgen = "0.69.4"
 camino = "1.1.7"
 cargo_metadata = "0.18.1"
 cc = "1.1.0"
+cfg-if = "1.0.0"
 clap = "4.5.9"
 clap-cargo = "0.14.0"
 itertools = "0.13.0"

crates/wdk-build/Cargo.toml

@@ -17,6 +17,7 @@ anyhow.workspace = true
 bindgen.workspace = true
 camino.workspace = true
 cargo_metadata.workspace = true
+cfg-if.workspace = true
 clap = { workspace = true, features = ["derive"] }
 clap-cargo.workspace = true
 lazy_static.workspace = true
@@ -33,6 +34,10 @@ windows = { workspace = true, features = [
 [dev-dependencies]
 windows = { workspace = true, features = ["Win32_UI_Shell"] }
 
+[lints.rust.unexpected_cfgs]
+level = "warn"
+check-cfg = ["cfg(wdk_build_unstable)", "cfg(skip_umdf_static_crt_check)"]
+
 # Cannot inherit workspace lints since overriding them is not supported yet: https://github.com/rust-lang/cargo/issues/13157
 # [lints]
 # workspace = true

crates/wdk-build/src/lib.rs

@@ -174,7 +174,14 @@ pub enum ConfigError {
     /// Error returned when the c runtime is not configured to be statically
     /// linked
     #[error(
-        "the C runtime is not properly configured to be statically linked. This is required for building kernel mode WDK drivers. The recommended solution is to add the following snippiet to a `.config.toml` file: [build]\n rustflags = [\"-C\", \"target-feature=+crt-static\"]\n\nSee https://doc.rust-lang.org/reference/linkage.html#static-and-dynamic-c-runtimes for more ways to enable static crt linkage."
+        "the C runtime is not properly configured to be statically linked. This is required for building WDK drivers. The recommended solution is to add the following snippet to a \
+        `.config.toml` file:
+[build]
+rustflags = [\"-C\", \"target-feature=+crt-static\"]
+
+\
+        See https://doc.rust-lang.org/reference/linkage.html#static-and-dynamic-c-runtimes for more ways \
+        to enable static crt linkage."
     )]
     StaticCrtNotEnabled,
 
@@ -665,8 +672,16 @@ impl Config {
     ///
     /// Panics if the invoked from outside a Cargo build environment
     pub fn configure_binary_build(&self) -> Result<(), ConfigError> {
-        if !Self::is_crt_static_linked() && matches!(self.driver_config, DriverConfig::Umdf(_)) {
-            return Err(ConfigError::StaticCrtNotEnabled);
+        if !Self::is_crt_static_linked() {
+            cfg_if::cfg_if! {
+                if #[cfg(all(wdk_build_unstable, skip_umdf_static_crt_check))] {
+                    if !matches!(self.driver_config, DriverConfig::Umdf(_)) {
+                        return Err(ConfigError::StaticCrtNotEnabled);
+                    }
+                } else {
+                    return Err(ConfigError::StaticCrtNotEnabled);
+                }
+            };
         }
 
         let library_paths: Vec<PathBuf> = self.get_library_paths()?;