[WIP]

Author: bjorn3

build_system/prepare.rs

@@ -18,6 +18,8 @@ pub(crate) fn prepare(dirs: &Dirs) {
 }
 
 pub(crate) fn prepare_stdlib(dirs: &Dirs, rustc: &Path) {
+    // FIXME don't recreate from scratch each time to preserve mtime as used by cargo to determine
+    // if a crate needs to be rebuilt
     let sysroot_src_orig = get_default_sysroot(rustc).join("lib/rustlib/src/rust");
     assert!(sysroot_src_orig.exists());
 

build_system/tests.rs

@@ -395,6 +395,7 @@ impl<'a> TestRunner<'a> {
                     );
                 }
                 TestCaseCmd::JitBin { source, args } => {
+                    // FIXME skip if --no-unstable-options
                     let mut jit_cmd = self.rustc_command([
                         "-Zunstable-options",
                         "-Cllvm-args=mode=jit",