Add --download-dir option to specify download dir separate from --out-dir

Author: bjorn3

build_system/mod.rs

@@ -75,6 +75,7 @@ pub(crate) fn main() {
     };
 
     let mut out_dir = PathBuf::from(".");
+    let mut download_dir = None;
     let mut channel = "release";
     let mut sysroot_kind = SysrootKind::Clif;
     let mut use_unstable_features = true;
@@ -84,7 +85,12 @@ pub(crate) fn main() {
             "--out-dir" => {
                 out_dir = PathBuf::from(args.next().unwrap_or_else(|| {
                     arg_error!("--out-dir requires argument");
-                }))
+                }));
+            }
+            "--download-dir" => {
+                download_dir = Some(PathBuf::from(args.next().unwrap_or_else(|| {
+                    arg_error!("--download-dir requires argument");
+                })));
             }
             "--debug" => channel = "debug",
             "--sysroot" => {
@@ -139,7 +145,9 @@ pub(crate) fn main() {
     out_dir = current_dir.join(out_dir);
     let dirs = path::Dirs {
         source_dir: current_dir.clone(),
-        download_dir: out_dir.join("download"),
+        download_dir: download_dir
+            .map(|dir| current_dir.join(dir))
+            .unwrap_or_else(|| out_dir.join("download")),
         build_dir: out_dir.join("build"),
         dist_dir: out_dir.join("dist"),
         frozen,

build_system/usage.txt

@@ -1,11 +1,11 @@
 The build system of cg_clif.
 
 USAGE:
-    ./y.rs prepare [--out-dir DIR]
-    ./y.rs build [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--no-unstable-features] [--frozen]
-    ./y.rs test [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--no-unstable-features] [--frozen]
-    ./y.rs abi-cafe [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--no-unstable-features] [--frozen]
-    ./y.rs bench [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--no-unstable-features] [--frozen]
+    ./y.rs prepare [--out-dir DIR] [--download-dir DIR]
+    ./y.rs build [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--download-dir DIR] [--no-unstable-features] [--frozen]
+    ./y.rs test [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--download-dir DIR] [--no-unstable-features] [--frozen]
+    ./y.rs abi-cafe [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--download-dir DIR] [--no-unstable-features] [--frozen]
+    ./y.rs bench [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--download-dir DIR] [--no-unstable-features] [--frozen]
 
 OPTIONS:
     --debug
@@ -22,6 +22,9 @@ OPTIONS:
             Specify the directory in which the download, build and dist directories are stored.
             By default this is the working directory.
 
+    --download-dir DIR
+            Specify the directory in which the download directory is stored. Overrides --out-dir.
+
     --no-unstable-features
             Some features are not yet ready for production usage. This option will disable these
             features. This includes the JIT mode and inline assembly support.