Auto merge of #74862 - mark-i-m:mv-compiler, r=petrochenkov

Move almost all compiler crates to compiler/

This PR implements https://github.com/rust-lang/compiler-team/issues/336 and moves all `rustc_*` crates from `src` to the new `compiler` directory.

`librustc_foo` directories are renamed to `rustc_foo`.
`src` directories are introduced inside `rustc_*` directories to mirror the scheme already use for `library` crates.

1 files changed, 37 insertions, 0 deletions

diff --git a/compiler/rustc_target/src/spec/vxworks_base.rs b/compiler/rustc_target/src/spec/vxworks_base.rs
new file mode 100644
index 00000000000..777bb58d7db
--- /dev/null
+++ b/compiler/rustc_target/src/spec/vxworks_base.rs
@@ -0,0 +1,37 @@
+use crate::spec::{LinkArgs, LinkerFlavor, TargetOptions};
+
+pub fn opts() -> TargetOptions {
+    let mut args = LinkArgs::new();
+    args.insert(
+        LinkerFlavor::Gcc,
+        vec![
+            // We want to be able to strip as much executable code as possible
+            // from the linker command line, and this flag indicates to the
+            // linker that it can avoid linking in dynamic libraries that don't
+            // actually satisfy any symbols up to that point (as with many other
+            // resolutions the linker does). This option only applies to all
+            // following libraries so we're sure to pass it as one of the first
+            // arguments.
+            "-Wl,--as-needed".to_string(),
+        ],
+    );
+
+    TargetOptions {
+        linker: Some("wr-c++".to_string()),
+        exe_suffix: ".vxe".to_string(),
+        dynamic_linking: true,
+        executables: true,
+        target_family: Some("unix".to_string()),
+        linker_is_gnu: true,
+        has_rpath: true,
+        pre_link_args: args,
+        position_independent_executables: false,
+        has_elf_tls: true,
+        crt_static_default: true,
+        crt_static_respected: true,
+        crt_static_allows_dylibs: true,
+        // VxWorks needs to implement this to support profiling
+        target_mcount: "_mcount".to_string(),
+        ..Default::default()
+    }
+}