Auto merge of #43454 - Mark-Simulacrum:rollup, r=Mark-Simulacrum

Rollup of 11 pull requests

- Successful merges: #43297, #43322, #43342, #43361, #43366, #43374, #43379, #43401, #43421, #43428, #43446
- Failed merges:

Author: bors

configure

@@ -560,8 +560,8 @@ case "$CFG_RELEASE_CHANNEL" in
           *-pc-windows-gnu)
             ;;
           *)
-            CFG_ENABLE_DEBUGINFO_LINES=1
-            CFG_ENABLE_DEBUGINFO_ONLY_STD=1
+            enable_if_not_disabled debuginfo-lines
+            enable_if_not_disabled debuginfo-only-std
             ;;
         esac
 
@@ -572,8 +572,8 @@ case "$CFG_RELEASE_CHANNEL" in
           *-pc-windows-gnu)
             ;;
           *)
-            CFG_ENABLE_DEBUGINFO_LINES=1
-            CFG_ENABLE_DEBUGINFO_ONLY_STD=1
+            enable_if_not_disabled debuginfo-lines
+            enable_if_not_disabled debuginfo-only-std
             ;;
         esac
 	;;

src/doc/unstable-book/src/language-features/lang-items.md

@@ -194,6 +194,14 @@ pub extern fn rust_begin_panic(_msg: core::fmt::Arguments,
 }
 ```
 
+In many cases, you may need to manually link to the `compiler_builtins` crate
+when building a `no_std` binary. You may observe this via linker error messages
+such as "```undefined reference to `__rust_probestack'```". Using this crate
+also requires enabling the library feature `compiler_builtins_lib`. You can read
+more about this [here][compiler-builtins-lib].
+
+[compiler-builtins-lib]: library-features/compiler-builtins-lib.html
+
 ## More about the language items
 
 The compiler currently makes a few assumptions about symbols which are