From e3b7d2e3d3b4fcbc6591de606957c0fd59b5e547 Mon Sep 17 00:00:00 2001
From: Josh Stone <jistone@redhat.com>
Date: Thu, 28 Sep 2023 18:18:16 -0700
Subject: [PATCH 2/2] set an external library path for wasm32-wasi

---
 compiler/rustc_codegen_ssa/src/back/link.rs             | 9 +++++++++
 compiler/rustc_target/src/spec/mod.rs                   | 4 ++++
 compiler/rustc_target/src/spec/targets/wasm32_wasip1.rs | 7 ++++---
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index f5e8d5fc92a9..f4ad3f725427 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -1563,6 +1563,12 @@ fn get_object_file_path(sess: &Session, name: &str, self_contained: bool) -> Pat
             return file_path;
         }
     }
+    if let Some(lib_path) = &sess.target.options.external_lib_path {
+        let file_path = Path::new(lib_path.as_ref()).join(name);
+        if file_path.exists() {
+            return file_path;
+        }
+    }
     for search_path in fs.search_paths() {
         let file_path = search_path.dir.join(name);
         if file_path.exists() {
@@ -2049,6 +2055,9 @@ fn add_library_search_dirs(cmd: &mut dyn Linker, sess: &Session, self_contained:
         let lib_path = sess.target_filesearch(PathKind::All).get_self_contained_lib_path();
         cmd.include_path(&fix_windows_verbatim_for_gcc(&lib_path));
     }
+    if let Some(lib_path) = &sess.target.options.external_lib_path {
+        cmd.include_path(Path::new(lib_path.as_ref()));
+    }
 }
 
 /// Add options making relocation sections in the produced ELF files read-only
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 941d767b850d..cd0a2ce51989 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -1881,6 +1881,7 @@ pub struct TargetOptions {
     /// Objects to link before and after all other object code.
     pub pre_link_objects: CrtObjects,
     pub post_link_objects: CrtObjects,
+    pub external_lib_path: Option<StaticCow<str>>,
     /// Same as `(pre|post)_link_objects`, but when self-contained linking mode is enabled.
     pub pre_link_objects_self_contained: CrtObjects,
     pub post_link_objects_self_contained: CrtObjects,
@@ -2368,6 +2369,7 @@ fn default() -> TargetOptions {
             relro_level: RelroLevel::None,
             pre_link_objects: Default::default(),
             post_link_objects: Default::default(),
+            external_lib_path: None,
             pre_link_objects_self_contained: Default::default(),
             post_link_objects_self_contained: Default::default(),
             link_self_contained: LinkSelfContainedDefault::False,
@@ -3064,6 +3066,7 @@ macro_rules! key {
         key!(linker_is_gnu_json = "linker-is-gnu", bool);
         key!(pre_link_objects = "pre-link-objects", link_objects);
         key!(post_link_objects = "post-link-objects", link_objects);
+        key!(external_lib_path, optional);
         key!(pre_link_objects_self_contained = "pre-link-objects-fallback", link_objects);
         key!(post_link_objects_self_contained = "post-link-objects-fallback", link_objects);
         // Deserializes the backwards-compatible variants of `-Clink-self-contained`
@@ -3327,6 +3330,7 @@ macro_rules! target_option_val {
         target_option_val!(linker_is_gnu_json, "linker-is-gnu");
         target_option_val!(pre_link_objects);
         target_option_val!(post_link_objects);
+        target_option_val!(external_lib_path);
         target_option_val!(pre_link_objects_self_contained, "pre-link-objects-fallback");
         target_option_val!(post_link_objects_self_contained, "post-link-objects-fallback");
         target_option_val!(link_args - pre_link_args_json, "pre-link-args");
diff --git a/compiler/rustc_target/src/spec/targets/wasm32_wasip1.rs b/compiler/rustc_target/src/spec/targets/wasm32_wasip1.rs
index 7cbe9f09e6ca..b524890c2ec5 100644
--- a/compiler/rustc_target/src/spec/targets/wasm32_wasip1.rs
+++ b/compiler/rustc_target/src/spec/targets/wasm32_wasip1.rs
@@ -20,11 +20,12 @@ pub fn target() -> Target {
     options.os = "wasi".into();
     options.add_pre_link_args(LinkerFlavor::WasmLld(Cc::Yes), &["--target=wasm32-wasi"]);
 
-    options.pre_link_objects_self_contained = crt_objects::pre_wasi_self_contained();
-    options.post_link_objects_self_contained = crt_objects::post_wasi_self_contained();
+    options.pre_link_objects = crt_objects::pre_wasi_self_contained();
+    options.post_link_objects = crt_objects::post_wasi_self_contained();
 
     // FIXME: Figure out cases in which WASM needs to link with a native toolchain.
-    options.link_self_contained = LinkSelfContainedDefault::True;
+    options.link_self_contained = LinkSelfContainedDefault::False;
+    options.external_lib_path = Some("/usr/wasm32-wasi/lib/wasm32-wasi".into());
 
     // Right now this is a bit of a workaround but we're currently saying that
     // the target by default has a static crt which we're taking as a signal
-- 
2.44.0