std: Remove the `wasm_syscall` feature

This commit removes the `wasm_syscall` feature from the
wasm32-unknown-unknown build of the standard library. This feature was
originally intended to allow an opt-in way to interact with the
operating system in a posix-like way but it was never stabilized.
Nowadays with the advent of the `wasm32-wasi` target that should
entirely replace the intentions of the `wasm_syscall` feature.

3 files changed, 0 insertions, 16 deletions

diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
index a5bfafdfdb4..43d9264eaca 100644
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -122,7 +122,6 @@ pub struct Config {
 
     // libstd features
     pub backtrace: bool, // support for RUST_BACKTRACE
-    pub wasm_syscall: bool,
 
     // misc
     pub low_priority: bool,
@@ -318,7 +317,6 @@ struct Rust {
     save_toolstates: Option<String>,
     codegen_backends: Option<Vec<String>>,
     codegen_backends_dir: Option<String>,
-    wasm_syscall: Option<bool>,
     lld: Option<bool>,
     lldb: Option<bool>,
     llvm_tools: Option<bool>,
@@ -558,7 +556,6 @@ impl Config {
             if let Some(true) = rust.incremental {
                 config.incremental = true;
             }
-            set(&mut config.wasm_syscall, rust.wasm_syscall);
             set(&mut config.lld_enabled, rust.lld);
             set(&mut config.lldb_enabled, rust.lldb);
             set(&mut config.llvm_tools_enabled, rust.llvm_tools);
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index c0e0ad1a857..0982f224733 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -498,9 +498,6 @@ impl Build {
         if self.config.profiler {
             features.push_str(" profiler");
         }
-        if self.config.wasm_syscall {
-            features.push_str(" wasm_syscall");
-        }
         features
     }
 
diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
index 2bb053cc2b0..97b28ed9e96 100644
--- a/src/bootstrap/test.rs
+++ b/src/bootstrap/test.rs
@@ -1811,16 +1811,6 @@ impl Step for Crate {
                     .expect("nodejs not configured"),
             );
         } else if target.starts_with("wasm32") {
-            // Warn about running tests without the `wasm_syscall` feature enabled.
-            // The javascript shim implements the syscall interface so that test
-            // output can be correctly reported.
-            if !builder.config.wasm_syscall {
-                builder.info(
-                    "Libstd was built without `wasm_syscall` feature enabled: \
-                     test output may not be visible."
-                );
-            }
-
             // On the wasm32-unknown-unknown target we're using LTO which is
             // incompatible with `-C prefer-dynamic`, so disable that here
             cargo.env("RUSTC_NO_PREFER_DYNAMIC", "1");