stdbuf: add external_libstdbuf cfg alias

Author: xtqqczze

Cargo.lock

@@ -19,6 +19,9 @@ workspace = true
 [lib]
 path = "src/stdbuf.rs"
 
+[build-dependencies]
+cfg_aliases.workspace = true
+
 [dependencies]
 clap = { workspace = true }
 libstdbuf = { package = "uu_stdbuf_libstdbuf", version = "0.6.0", path = "src/libstdbuf" }

src/uu/stdbuf/Cargo.toml

@@ -9,6 +9,8 @@ use std::fs;
 use std::path::Path;
 use std::process::Command;
 
+use cfg_aliases::cfg_aliases;
+
 #[cfg(any(
     target_os = "linux",
     target_os = "android",
@@ -32,6 +34,10 @@ mod platform {
 }
 
 fn main() {
+    cfg_aliases! {
+        external_libstdbuf: { feature = "feat_external_libstdbuf" },
+    }
+
     println!("cargo:rerun-if-changed=build.rs");
     println!("cargo:rerun-if-changed=src/libstdbuf/src/libstdbuf.rs");
 

src/uu/stdbuf/build.rs

@@ -30,7 +30,7 @@ mod options {
 }
 
 #[cfg(all(
-    not(feature = "feat_external_libstdbuf"),
+    not(external_libstdbuf),
     any(
         target_os = "linux",
         target_os = "android",
@@ -42,10 +42,10 @@ mod options {
 ))]
 const STDBUF_INJECT: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/libstdbuf.so"));
 
-#[cfg(all(not(feature = "feat_external_libstdbuf"), target_vendor = "apple"))]
+#[cfg(all(not(external_libstdbuf), target_vendor = "apple"))]
 const STDBUF_INJECT: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/libstdbuf.dylib"));
 
-#[cfg(all(not(feature = "feat_external_libstdbuf"), target_os = "cygwin"))]
+#[cfg(all(not(external_libstdbuf), target_os = "cygwin"))]
 const STDBUF_INJECT: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/libstdbuf.dll"));
 
 enum BufferType {
@@ -158,7 +158,7 @@ fn set_command_env(command: &mut process::Command, buffer_name: &str, buffer_typ
     }
 }
 
-#[cfg(not(feature = "feat_external_libstdbuf"))]
+#[cfg(not(external_libstdbuf))]
 fn get_preload_env(tmp_dir: &TempDir) -> UResult<(String, PathBuf)> {
     use std::fs::File;
     use std::io::Write;
@@ -172,7 +172,7 @@ fn get_preload_env(tmp_dir: &TempDir) -> UResult<(String, PathBuf)> {
     Ok((preload.to_owned(), inject_path))
 }
 
-#[cfg(feature = "feat_external_libstdbuf")]
+#[cfg(external_libstdbuf)]
 fn get_preload_env(_tmp_dir: &TempDir) -> UResult<(String, PathBuf)> {
     let (preload, extension) = preload_strings()?;