poky/meta/recipes-devtools/rust/files/revert-link-std-statically-in-rustc_driver-feature.patch

rust: oe-selftest issue fix with v1.82

A new feature "Link std statically in rustc_driver" was introduced 
in rust_1.82 [https://github.com/rust-lang/rust/pull/122362],and 
which is causing the below failure in oe-selftest.

Running unittests src/main.rs (build/x86_64-unknown-linux-gnu/stage1-rustc/
x86_64-poky-linux-gnu/release/deps/rustc_main-92223b15c9f2d827)
uploaded ".../build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-poky-linux-gnu/
release/deps/rustc_main-92223b15c9f2d827", waiting for result
/tmp/work/test4056/rustc_main-92223b15c9f2d827: error while loading shared 
libraries: librustc_driver-fb0866b1cd913c20.so: cannot open shared object file: No 
such file or directory

The rustc_main binary depends on the librustc_driver-*.so file. However, 
this file has not been copied to QEMU. If we manually copy the file into 
QEMU and export the LD_LIBRARY_PATH, the issue does not occur. Issue 
reprorted to upstream and reverted the buggy code as a workaround.

Upstream-Status: Inappropriate [reported at https://github.com/rust-lang/rust/issues/136237]

Signed-off-by: Deepesh Varatharajan <Deepesh.Varatharajan@windriver.com>
diff --git a/compiler/rustc/src/main.rs b/compiler/rustc/src/main.rs
index e9a7397557..29766fc9d8 100644
--- a/compiler/rustc/src/main.rs
+++ b/compiler/rustc/src/main.rs
@@ -1,6 +1,3 @@
-// We need this feature as it changes `dylib` linking behavior and allows us to link to `rustc_driver`.
-#![feature(rustc_private)]
-
 // A note about jemalloc: rustc uses jemalloc when built for CI and
 // distribution. The obvious way to do this is with the `#[global_allocator]`
 // mechanism. However, for complicated reasons (see
diff --git a/compiler/rustc_metadata/src/dependency_format.rs b/compiler/rustc_metadata/src/dependency_format.rs
index 39fa23766b..51d86b4009 100644
--- a/compiler/rustc_metadata/src/dependency_format.rs
+++ b/compiler/rustc_metadata/src/dependency_format.rs
@@ -51,7 +51,7 @@
 //! Additionally, the algorithm is geared towards finding *any* solution rather
 //! than finding a number of solutions (there are normally quite a few).

-use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_data_structures::fx::FxHashMap;
 use rustc_hir::def_id::CrateNum;
 use rustc_middle::bug;
 use rustc_middle::middle::dependency_format::{Dependencies, DependencyList, Linkage};
@@ -162,43 +162,18 @@ fn calculate_type(tcx: TyCtxt<'_>, ty: CrateType) -> DependencyList {
         Linkage::Dynamic | Linkage::IncludedFromDylib => {}
     }

-    let all_dylibs = || {
-        tcx.crates(()).iter().filter(|&&cnum| {
-            !tcx.dep_kind(cnum).macros_only() && tcx.used_crate_source(cnum).dylib.is_some()
-        })
-    };
-
-    let mut upstream_in_dylibs = FxHashSet::default();
-
-    if tcx.features().rustc_private {
-        // We need this to prevent users of `rustc_driver` from linking dynamically to `std`
-        // which does not work as `std` is also statically linked into `rustc_driver`.
-
-        // Find all libraries statically linked to upstream dylibs.
-        for &cnum in all_dylibs() {
-            let deps = tcx.dylib_dependency_formats(cnum);
-            for &(depnum, style) in deps.iter() {
-                if let RequireStatic = style {
-                    upstream_in_dylibs.insert(depnum);
-                }
-            }
-        }
-    }
-
     let mut formats = FxHashMap::default();

     // Sweep all crates for found dylibs. Add all dylibs, as well as their
     // dependencies, ensuring there are no conflicts. The only valid case for a
     // dependency to be relied upon twice is for both cases to rely on a dylib.
-    for &cnum in all_dylibs() {
-        if upstream_in_dylibs.contains(&cnum) {
-            info!("skipping dylib: {}", tcx.crate_name(cnum));
-            // If this dylib is also available statically linked to another dylib
-            // we try to use that instead.
+    for &cnum in tcx.crates(()).iter() {
+        if tcx.dep_kind(cnum).macros_only() {
             continue;
         }
-
         let name = tcx.crate_name(cnum);
+        let src = tcx.used_crate_source(cnum);
+        if src.dylib.is_some() {
         info!("adding dylib: {}", name);
         add_library(tcx, cnum, RequireDynamic, &mut formats, &mut unavailable_as_static);
         let deps = tcx.dylib_dependency_formats(cnum);
@@ -207,6 +182,7 @@ fn calculate_type(tcx: TyCtxt<'_>, ty: CrateType) -> DependencyList {
             add_library(tcx, depnum, style, &mut formats, &mut unavailable_as_static);
         }
     }
+    }

     // Collect what we've got so far in the return vector.
     let last_crate = tcx.crates(()).len();
diff --git a/src/bootstrap/src/bin/rustc.rs b/src/bootstrap/src/bin/rustc.rs
index d04e2fbeb7..011c289d93 100644
--- a/src/bootstrap/src/bin/rustc.rs
+++ b/src/bootstrap/src/bin/rustc.rs
@@ -89,25 +89,6 @@ fn main() {
         rustc_real
     };

-    // Get the name of the crate we're compiling, if any.
-    let crate_name = parse_value_from_args(&orig_args, "--crate-name");
-
-    // When statically linking `std` into `rustc_driver`, remove `-C prefer-dynamic`
-    if env::var("RUSTC_LINK_STD_INTO_RUSTC_DRIVER").unwrap() == "1"
-        && crate_name == Some("rustc_driver")
-        && stage != "0"
-    {
-        if let Some(pos) = args.iter().enumerate().position(|(i, a)| {
-            a == "-C" && args.get(i + 1).map(|a| a == "prefer-dynamic").unwrap_or(false)
-        }) {
-            args.remove(pos);
-            args.remove(pos);
-        }
-        if let Some(pos) = args.iter().position(|a| a == "-Cprefer-dynamic") {
-            args.remove(pos);
-        }
-    }
-
     let mut cmd = match env::var_os("RUSTC_WRAPPER_REAL") {
         Some(wrapper) if !wrapper.is_empty() => {
             let mut cmd = Command::new(wrapper);
@@ -118,6 +99,9 @@ fn main() {
     };
     cmd.args(&args).env(dylib_path_var(), env::join_paths(&dylib_path).unwrap());

+    // Get the name of the crate we're compiling, if any.
+    let crate_name = parse_value_from_args(&orig_args, "--crate-name");
+
     if let Some(crate_name) = crate_name {
         if let Some(target) = env::var_os("RUSTC_TIME") {
             if target == "all"
diff --git a/src/bootstrap/src/core/builder.rs b/src/bootstrap/src/core/builder.rs
index ff0d1f3a72..b2c9602e57 100644
--- a/src/bootstrap/src/core/builder.rs
+++ b/src/bootstrap/src/core/builder.rs
@@ -2153,7 +2153,7 @@ impl<'a> Builder<'a> {
         // When we build Rust dylibs they're all intended for intermediate
         // usage, so make sure we pass the -Cprefer-dynamic flag instead of
         // linking all deps statically into the dylib.
-        if matches!(mode, Mode::Std) {
+        if matches!(mode, Mode::Std | Mode::Rustc) {
             rustflags.arg("-Cprefer-dynamic");
         }
         if matches!(mode, Mode::Rustc) && !self.link_std_into_rustc_driver(target) {
diff --git a/src/tools/clippy/src/main.rs b/src/tools/clippy/src/main.rs
index c9853e53f3..c9af2138a7 100644
--- a/src/tools/clippy/src/main.rs
+++ b/src/tools/clippy/src/main.rs
@@ -1,6 +1,3 @@
-// We need this feature as it changes `dylib` linking behavior and allows us to link to
-// `rustc_driver`.
-#![feature(rustc_private)]
 // warn on lints, that are included in `rust-lang/rust`s bootstrap
 #![warn(rust_2018_idioms, unused_lifetimes)]

diff --git a/src/tools/clippy/tests/compile-test.rs b/src/tools/clippy/tests/compile-test.rs
index 9754254cdd..dd95cc71cd 100644
--- a/src/tools/clippy/tests/compile-test.rs
+++ b/src/tools/clippy/tests/compile-test.rs
@@ -1,4 +1,4 @@
-#![feature(rustc_private, let_chains)]
+#![feature(let_chains)]
 #![warn(rust_2018_idioms, unused_lifetimes)]
 #![allow(unused_extern_crates)]

diff --git a/src/tools/rustdoc/main.rs b/src/tools/rustdoc/main.rs
index d4099cafe5..5b499a1fa1 100644
--- a/src/tools/rustdoc/main.rs
+++ b/src/tools/rustdoc/main.rs
@@ -1,6 +1,3 @@
-// We need this feature as it changes `dylib` linking behavior and allows us to link to `rustc_driver`.
-#![feature(rustc_private)]
-
 fn main() {
     rustdoc::main()
 }
diff --git a/src/tools/rustfmt/src/git-rustfmt/main.rs b/src/tools/rustfmt/src/git-rustfmt/main.rs
index b8b0432aa9..b5bd71e015 100644
--- a/src/tools/rustfmt/src/git-rustfmt/main.rs
+++ b/src/tools/rustfmt/src/git-rustfmt/main.rs
@@ -1,7 +1,3 @@
-// We need this feature as it changes `dylib` linking behavior and allows us to link to
-// `rustc_driver`.
-#![feature(rustc_private)]
-
 use std::env;
 use std::io::stdout;
 use std::path::{Path, PathBuf};