nostd support with c-scape

mustang/Cargo.toml

@@ -34,6 +34,7 @@ features = [
 [target.'cfg(target_vendor = "mustang")'.dependencies]
 origin = { path = "../origin", default-features = false, version = "^0.6.1" }
 c-gull = { path = "../c-gull", version = "^0.6.1", optional = true }
+c-scape = { path = "../c-scape", version = "^0.6.1", default-features = false, optional = true }
 
 # A general-purpose `global_allocator` implementation.
 dlmalloc = { version = "0.2", features = ["global"], optional = true }
@@ -42,9 +43,12 @@ wee_alloc = { version = "0.4", optional = true }
 
 [features]
 default = ["default-alloc", "threads", "std"]
+default-nostd = ["default-alloc", "nostd-threads", "nostd"]
 default-alloc = ["dlmalloc"]
 threads = ["origin/threads", "c-gull/threads"]
 env_logger = ["origin/env_logger"]
 log = ["origin/log"]
 max_level_off = ["origin/max_level_off"]
 std = ["c-gull"]
+nostd-threads = ["origin/threads", "c-scape/threads"]
+nostd = ["c-scape"]

mustang/src/lib.rs

@@ -28,6 +28,9 @@ macro_rules! can_run_this {
 #[cfg(feature = "std")]
 #[cfg(target_vendor = "mustang")]
 extern crate c_gull;
+#[cfg(feature = "nostd")]
+#[cfg(target_vendor = "mustang")]
+extern crate c_scape;
 #[cfg(target_vendor = "mustang")]
 extern crate origin;
 #[cfg(not(target_arch = "arm"))]
@@ -50,3 +53,8 @@ static GLOBAL_ALLOCATOR: wee_alloc::WeeAlloc<'static> = wee_alloc::WeeAlloc::INI
 #[cfg(target_vendor = "mustang")]
 #[cfg(not(any(feature = "dlmalloc", feature = "wee_alloc")))]
 compile_error!("Either feature \"dlmalloc\" or \"wee_alloc\" must be enabled for this crate.");
+
+// `c-gull` contains `c-scape`, thus do not want to extern both crates
+#[cfg(target_vendor = "mustang")]
+#[cfg(all(feature = "std", feature = "nostd"))]
+compile_error!("\"std\" and \"nostd\" cannot both be enabled for this crate.");