Remove rustc_session::config::Config

The wrapper type led to tons of target.target
across the compiler. Its ptr_width field isn't
required any more, as target_pointer_width
is already present in parsed form.

compiler/rustc_codegen_llvm/src/attributes.rs

@@ -174,7 +174,6 @@ pub fn llvm_target_features(sess: &Session) -> impl Iterator<Item = &str> {
         .split(',')
         .filter(|f| !RUSTC_SPECIFIC_FEATURES.iter().any(|s| f.contains(s)));
     sess.target
-        .target
         .options
         .features
         .split(',')

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -15,7 +15,7 @@ use rustc_session::{filesearch, Session};
 use rustc_span::symbol::Symbol;
 use rustc_target::spec::crt_objects::{CrtObjects, CrtObjectsFallback};
 use rustc_target::spec::{LinkOutputKind, LinkerFlavor, LldFlavor};
-use rustc_target::spec::{PanicStrategy, RelocModel, RelroLevel};
+use rustc_target::spec::{PanicStrategy, RelocModel, RelroLevel, Target};
 
 use super::archive::ArchiveBuilder;
 use super::command::Command;
@@ -1842,12 +1842,8 @@ fn add_upstream_rust_crates<'a, B: ArchiveBuilder<'a>>(
     }
 
     // Converts a library file-stem into a cc -l argument
-    fn unlib<'a>(config: &config::Config, stem: &'a str) -> &'a str {
-        if stem.starts_with("lib") && !config.target.options.is_like_windows {
-            &stem[3..]
-        } else {
-            stem
-        }
+    fn unlib<'a>(target: &Target, stem: &'a str) -> &'a str {
+        if stem.starts_with("lib") && !target.options.is_like_windows { &stem[3..] } else { stem }
     }
 
     // Adds the static "rlib" versions of all crates to the command line.

compiler/rustc_session/src/config.rs

@@ -34,11 +34,6 @@ use std::iter::{self, FromIterator};
 use std::path::{Path, PathBuf};
 use std::str::{self, FromStr};
 
-pub struct Config {
-    pub target: Target,
-    pub ptr_width: u32,
-}
-
 bitflags! {
     #[derive(Default, Encodable, Decodable)]
     pub struct SanitizerSet: u8 {
@@ -831,7 +826,7 @@ pub fn build_configuration(sess: &Session, mut user_cfg: CrateConfig) -> CrateCo
     user_cfg
 }
 
-pub fn build_target_config(opts: &Options, target_override: Option<Target>) -> Config {
+pub fn build_target_config(opts: &Options, target_override: Option<Target>) -> Target {
     let target_result = target_override.map_or_else(|| Target::search(&opts.target_triple), Ok);
     let target = target_result.unwrap_or_else(|e| {
         early_error(
@@ -855,9 +850,7 @@ pub fn build_target_config(opts: &Options, target_override: Option<Target>) -> C
         )
     }
 
-    let ptr_width = target.pointer_width;
-
-    Config { target, ptr_width }
+    target
 }
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]

compiler/rustc_session/src/session.rs

@@ -102,7 +102,7 @@ impl Mul<usize> for Limit {
 /// Represents the data associated with a compilation
 /// session for a single crate.
 pub struct Session {
-    pub target: config::Config,
+    pub target: Target,
     pub host: Target,
     pub opts: config::Options,
     pub host_tlib_path: SearchPath,
@@ -1258,7 +1258,7 @@ pub fn build_session(
 
     let loader = file_loader.unwrap_or(Box::new(RealFileLoader));
     let hash_kind = sopts.debugging_opts.src_hash_algorithm.unwrap_or_else(|| {
-        if target_cfg.target.options.is_like_msvc {
+        if target_cfg.options.is_like_msvc {
             SourceFileHashAlgorithm::Sha1
         } else {
             SourceFileHashAlgorithm::Md5
@@ -1368,8 +1368,8 @@ pub fn build_session(
         if candidate.join("library/std/src/lib.rs").is_file() { Some(candidate) } else { None }
     };
 
-    let asm_arch = if target_cfg.target.options.allow_asm {
-        InlineAsmArch::from_str(&target_cfg.target.arch).ok()
+    let asm_arch = if target_cfg.options.allow_asm {
+        InlineAsmArch::from_str(&target_cfg.arch).ok()
     } else {
         None
     };

src/tools/clippy/clippy_lints/src/trivially_copy_pass_by_ref.rs

@@ -9,10 +9,10 @@ use rustc_hir::intravisit::FnKind;
 use rustc_hir::{Body, FnDecl, HirId, ItemKind, MutTy, Mutability, Node};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty;
-use rustc_session::config::Config as SessionConfig;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::Span;
 use rustc_target::abi::LayoutOf;
+use rustc_target::spec::Target;
 use rustc_target::spec::abi::Abi;
 
 declare_clippy_lint! {
@@ -60,9 +60,9 @@ pub struct TriviallyCopyPassByRef {
 }
 
 impl<'tcx> TriviallyCopyPassByRef {
-    pub fn new(limit: Option<u64>, target: &SessionConfig) -> Self {
+    pub fn new(limit: Option<u64>, target: &Target) -> Self {
         let limit = limit.unwrap_or_else(|| {
-            let bit_width = u64::from(target.ptr_width);
+            let bit_width = u64::from(target.pointer_width);
             // Cap the calculated bit width at 32-bits to reduce
             // portability problems between 32 and 64-bit targets
             let bit_width = cmp::min(bit_width, 32);