Remove `compiler_builtins_lib` documentation

Fixes #67593

2 files changed, 1 insertions, 40 deletions

diff --git a/src/doc/unstable-book/src/language-features/lang-items.md b/src/doc/unstable-book/src/language-features/lang-items.md
index d4ad65e84b7..6f096e582f5 100644
--- a/src/doc/unstable-book/src/language-features/lang-items.md
+++ b/src/doc/unstable-book/src/language-features/lang-items.md
@@ -188,11 +188,7 @@ pub extern fn rust_begin_panic(info: &PanicInfo) -> ! {
 
 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.md
+such as "```undefined reference to `__rust_probestack'```".
 
 ## More about the language items
 
diff --git a/src/doc/unstable-book/src/library-features/compiler-builtins-lib.md b/src/doc/unstable-book/src/library-features/compiler-builtins-lib.md
deleted file mode 100644
index 6c71c3f2ce1..00000000000
--- a/src/doc/unstable-book/src/library-features/compiler-builtins-lib.md
+++ /dev/null
@@ -1,35 +0,0 @@
-# `compiler_builtins_lib`
-
-The tracking issue for this feature is: None.
-
-------------------------
-
-This feature is required to link to the `compiler_builtins` crate which contains
-"compiler intrinsics". Compiler intrinsics are software implementations of basic
-operations like multiplication of `u64`s. These intrinsics are only required on
-platforms where these operations don't directly map to a hardware instruction.
-
-You should never need to explicitly link to the `compiler_builtins` crate when
-building "std" programs as `compiler_builtins` is already in the dependency
-graph of `std`. But you may need it when building `no_std` **binary** crates. If
-you get a *linker* error like:
-
-``` text
-$PWD/src/main.rs:11: undefined reference to `__aeabi_lmul'
-$PWD/src/main.rs:11: undefined reference to `__aeabi_uldivmod'
-```
-
-That means that you need to link to this crate.
-
-When you link to this crate, make sure it only appears once in your crate
-dependency graph. Also, it doesn't matter where in the dependency graph you
-place the `compiler_builtins` crate.
-
-<!-- NOTE(ignore) doctests don't support `no_std` binaries -->
-
-``` rust,ignore
-#![feature(compiler_builtins_lib)]
-#![no_std]
-
-extern crate compiler_builtins;
-```