Revert "Make the `c` feature for `compiler-builtins` opt-in instead of inferred"

[rust.git] / src / bootstrap / config.rs

diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
index 635823b958b18b50bb045988e2baafaabf35c3e6..34d5504827cfb37def8f20498f8ae511f5d82e34 100644 (file)
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -73,8 +73,6 @@ pub struct Config {
     pub color: Color,
     pub patch_binaries_for_nix: bool,
     pub stage0_metadata: Stage0Metadata,
-    /// Whether to use the `c` feature of the `compiler_builtins` crate.
-    pub optimized_compiler_builtins: bool,
 
     pub on_fail: Option<String>,
     pub stage: u32,
@@ -158,6 +156,7 @@ pub struct Config {
     pub rust_new_symbol_mangling: Option<bool>,
     pub rust_profile_use: Option<String>,
     pub rust_profile_generate: Option<String>,
+    pub rust_lto: RustcLto,
     pub llvm_profile_use: Option<String>,
     pub llvm_profile_generate: bool,
     pub llvm_libunwind_default: Option<LlvmLibunwind>,
@@ -319,6 +318,28 @@ fn default_for_platform(target: &str) -> Self {
     }
 }
 
+/// LTO mode used for compiling rustc itself.
+#[derive(Default, Clone)]
+pub enum RustcLto {
+    #[default]
+    ThinLocal,
+    Thin,
+    Fat,
+}
+
+impl std::str::FromStr for RustcLto {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "thin-local" => Ok(RustcLto::ThinLocal),
+            "thin" => Ok(RustcLto::Thin),
+            "fat" => Ok(RustcLto::Fat),
+            _ => Err(format!("Invalid value for rustc LTO: {}", s)),
+        }
+    }
+}
+
 #[derive(Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct TargetSelection {
     pub triple: Interned<String>,
@@ -601,7 +622,6 @@ struct Build {
         bench_stage: Option<u32> = "bench-stage",
         patch_binaries_for_nix: Option<bool> = "patch-binaries-for-nix",
         metrics: Option<bool> = "metrics",
-        optimized_compiler_builtins: Option<bool> = "optimized-compiler-builtins",
     }
 }
 
@@ -726,6 +746,7 @@ struct Rust {
         profile_use: Option<String> = "profile-use",
         // ignored; this is set from an env var set by bootstrap.py
         download_rustc: Option<StringOrBool> = "download-rustc",
+        lto: Option<String> = "lto",
     }
 }
 
@@ -989,7 +1010,6 @@ pub fn parse(args: &[String]) -> Config {
         set(&mut config.print_step_timings, build.print_step_timings);
         set(&mut config.print_step_rusage, build.print_step_rusage);
         set(&mut config.patch_binaries_for_nix, build.patch_binaries_for_nix);
-        set(&mut config.optimized_compiler_builtins, build.optimized_compiler_builtins);
 
         config.verbose = cmp::max(config.verbose, flags.verbose);
 
@@ -1173,6 +1193,12 @@ pub fn parse(args: &[String]) -> Config {
             config.rust_profile_use = flags.rust_profile_use.or(rust.profile_use);
             config.rust_profile_generate = flags.rust_profile_generate.or(rust.profile_generate);
             config.download_rustc_commit = download_ci_rustc_commit(&config, rust.download_rustc);
+
+            config.rust_lto = rust
+                .lto
+                .as_deref()
+                .map(|value| RustcLto::from_str(value).unwrap())
+                .unwrap_or_default();
         } else {
             config.rust_profile_use = flags.rust_profile_use;
             config.rust_profile_generate = flags.rust_profile_generate;