Disable download-rustc for library profile

Noratrieb · web-flow · commit 9adbf6270ec8 · 2025-07-07T13:02:00.000+02:00
The feature currently completely breaks `x test`, core functionality of working on the standard library.
Therefore it should be disabled by default until that problem is fixed.
Having to wait a bit longer for a check build is nothing compared to completely mysterious build errors when testing.
diff --git a/src/bootstrap/defaults/bootstrap.library.toml b/src/bootstrap/defaults/bootstrap.library.toml
@@ -12,7 +12,8 @@ lto = "off"
 #
 # If compiler-affecting directories are not modified, use precompiled rustc to speed up
 # library development by skipping compiler builds.
-download-rustc = "if-unchanged"
+# FIXME: download-rustc is currently broken: https://github.com/rust-lang/rust/issues/142505
+download-rustc = false
 
 [llvm]
 # Will download LLVM from CI if available on your platform.

Original file line number	Diff line number	Diff line change
`@@ -12,7 +12,8 @@ lto = "off"`
`12`	`12`	`#`
`13`	`13`	`# If compiler-affecting directories are not modified, use precompiled rustc to speed up`
`14`	`14`	`# library development by skipping compiler builds.`
`15`		`-download-rustc = "if-unchanged"`
	`15`	`+# FIXME: download-rustc is currently broken: https://github.com/rust-lang/rust/issues/142505`
	`16`	`+download-rustc = false`
`16`	`17`
`17`	`18`	`[llvm]`
`18`	`19`	`# Will download LLVM from CI if available on your platform.`