Use Cargo's target information when possible

dev-tools/gen-target-info/src/main.rs

@@ -1,41 +1,11 @@
-use gen_target_info::{get_target_specs_from_json, write_target_tuple_mapping, RustcTargetSpecs};
-use std::{collections::BTreeMap, fs::File, io::Write as _};
+use std::{fs::File, io::Write as _};
 
 const PRELUDE: &str = r#"//! This file is generated code. Please edit the generator
 //! in dev-tools/gen-target-info if you need to make changes.
 
 "#;
 
-fn generate_riscv_arch_mapping(f: &mut File, target_specs: &RustcTargetSpecs) {
- let riscv_target_mapping = target_specs
- .0
- .iter()
- .filter_map(|(target, target_spec)| {
- let arch = target.split_once('-').unwrap().0;
- (arch.contains("riscv") && arch != target_spec.arch)
- .then_some((arch, &*target_spec.arch))
- })
- .collect::<BTreeMap<_, _>>();
- write_target_tuple_mapping(f, "RISCV_ARCH_MAPPING", &riscv_target_mapping);
-}
-
-fn generate_windows_triple_mapping(f: &mut File, target_specs: &RustcTargetSpecs) {
- let windows_target_mapping = target_specs
- .0
- .iter()
- .filter_map(|(target, target_spec)| {
- let rust_target_parts = target.splitn(4, '-').collect::<Vec<_>>();
- let os = *rust_target_parts.get(2)?;
- (os.contains("windows") && target != &*target_spec.llvm_target)
- .then_some((&**target, &*target_spec.llvm_target))
- })
- .collect::<BTreeMap<_, _>>();
- write_target_tuple_mapping(f, "WINDOWS_TRIPLE_MAPPING", &windows_target_mapping);
-}
-
 fn main() {
- let target_specs = get_target_specs_from_json();
-
  // Open file to write to
  let manifest_dir = env!("CARGO_MANIFEST_DIR");
 
@@ -45,8 +15,7 @@ fn main() {
  f.write_all(PRELUDE.as_bytes()).unwrap();
 
  // Start generating
- generate_riscv_arch_mapping(&mut f, &target_specs);
- generate_windows_triple_mapping(&mut f, &target_specs);
+ // TODO
 
  // Flush the data onto disk
  f.flush().unwrap();