make optimized-compiler-builtins target configurable

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/src/core/build_steps/compile.rs

@@ -469,7 +469,7 @@ pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, car
 // If `compiler-rt` is available ensure that the `c` feature of the
 // `compiler-builtins` crate is enabled and it's configured to learn where
 // `compiler-rt` is located.
-let compiler_builtins_c_feature = if builder.config.optimized_compiler_builtins{
+let compiler_builtins_c_feature = if builder.config.optimized_compiler_builtins(target){
 // NOTE: this interacts strangely with `llvm-has-rust-patches`. In that case, we enforce `submodules = false`, so this is a no-op.
 // But, the user could still decide to manually use an in-tree submodule.
 //

src/bootstrap/src/core/config/config.rs

@@ -634,6 +634,7 @@ pub struct Target {
 pubrunner:Option<String>,
 pubno_std:bool,
 pubcodegen_backends:Option<Vec<String>>,
+puboptimized_compiler_builtins:Option<bool>,
 }
 
 implTarget{
@@ -1219,6 +1220,7 @@ define_config! {
  no_std:Option<bool> = "no-std",
  codegen_backends:Option<Vec<String>> = "codegen-backends",
  runner:Option<String> = "runner",
+ optimized_compiler_builtins:Option<bool> = "optimized-compiler-builtins",
 }
 }
 
@@ -2096,6 +2098,7 @@ impl Config {
  target.sanitizers = cfg.sanitizers;
  target.profiler = cfg.profiler;
  target.rpath = cfg.rpath;
+ target.optimized_compiler_builtins = cfg.optimized_compiler_builtins;
 
 ifletSome(ref backends) = cfg.codegen_backends{
 let available_backends = ["llvm","cranelift","gcc"];
@@ -2609,6 +2612,13 @@ impl Config {
 self.target_config.get(&target).and_then(|t| t.rpath).unwrap_or(self.rust_rpath)
 }
 
+pubfnoptimized_compiler_builtins(&self,target:TargetSelection) -> bool{
+self.target_config
+.get(&target)
+.and_then(|t| t.optimized_compiler_builtins)
+.unwrap_or(self.optimized_compiler_builtins)
+}
+
 pubfnllvm_enabled(&self,target:TargetSelection) -> bool{
 self.codegen_backends(target).contains(&"llvm".to_owned())
 }