Add config file for tools enabling stage1 downloads by default

Otherwise no one will be able to find the setting.

2 files changed, 17 insertions, 2 deletions

diff --git a/src/bootstrap/defaults/config.compiler.toml b/src/bootstrap/defaults/config.compiler.toml
index 0ca928843d5..883bfead64e 100644
--- a/src/bootstrap/defaults/config.compiler.toml
+++ b/src/bootstrap/defaults/config.compiler.toml
@@ -8,6 +8,5 @@ debug-logging = true
 incremental = true
 
 [llvm]
-# Will download LLVM from CI if available on your platform (Linux only for now)
-# https://github.com/rust-lang/rust/issues/77084 tracks support for more platforms
+# Will download LLVM from CI if available on your platform.
 download-ci-llvm = "if-available"
diff --git a/src/bootstrap/defaults/config.tools.toml b/src/bootstrap/defaults/config.tools.toml
new file mode 100644
index 00000000000..182fb0fb067
--- /dev/null
+++ b/src/bootstrap/defaults/config.tools.toml
@@ -0,0 +1,16 @@
+# These defaults are meant for contributors to tools which build on the
+# compiler, but do not modify it directly.
+[rust]
+# This enables `RUSTC_LOG=debug`, avoiding confusing situations
+# where adding `debug!()` appears to do nothing.
+# However, it makes running the compiler slightly slower.
+debug-logging = true
+# This greatly increases the speed of rebuilds, especially when there are only minor changes. However, it makes the initial build slightly slower.
+incremental = true
+# Download rustc from CI instead of building it from source.
+# This cuts compile times by almost 60x, but means you can't modify the compiler.
+download-rustc = "if-unchanged"
+
+[llvm]
+# Will download LLVM from CI if available on your platform.
+download-ci-llvm = "if-available"