Disable docs for `compiler-builtins` and `sysroot`

Bootstrap already had a manual doc filter for the `sysroot` crate, but
other library crates keep themselves out of the public docs by setting
`[lib] doc = false` in their manifest. This seems like a better solution
to hide `compiler-builtins` docs, and removes the `sysroot` hack too.

3 files changed, 6 insertions, 4 deletions

diff --git a/library/compiler-builtins/compiler-builtins/Cargo.toml b/library/compiler-builtins/compiler-builtins/Cargo.toml
index c5446cd76e3..3ccb05f73fb 100644
--- a/library/compiler-builtins/compiler-builtins/Cargo.toml
+++ b/library/compiler-builtins/compiler-builtins/Cargo.toml
@@ -19,6 +19,8 @@ links = "compiler-rt"
 bench = false
 doctest = false
 test = false
+# make sure this crate isn't included in public standard library docs
+doc = false
 
 [dependencies]
 core = { path = "../../core", optional = true }
diff --git a/library/sysroot/Cargo.toml b/library/sysroot/Cargo.toml
index 3adc0224971..514728887fb 100644
--- a/library/sysroot/Cargo.toml
+++ b/library/sysroot/Cargo.toml
@@ -5,6 +5,10 @@ name = "sysroot"
 version = "0.0.0"
 edition = "2024"
 
+[lib]
+# make sure this crate isn't included in public standard library docs
+doc = false
+
 # this is a dummy crate to ensure that all required crates appear in the sysroot
 [dependencies]
 proc_macro = { path = "../proc_macro", public = true }
diff --git a/src/bootstrap/src/core/build_steps/doc.rs b/src/bootstrap/src/core/build_steps/doc.rs
index f7c4c5ad0bb..9e839b11c08 100644
--- a/src/bootstrap/src/core/build_steps/doc.rs
+++ b/src/bootstrap/src/core/build_steps/doc.rs
@@ -739,10 +739,6 @@ fn doc_std(
     }
 
     for krate in requested_crates {
-        if krate == "sysroot" {
-            // The sysroot crate is an implementation detail, don't include it in public docs.
-            continue;
-        }
         cargo.arg("-p").arg(krate);
     }