Disable Ctrl-C handling on WASM

WASM fundamentally doesn't support signals. If WASI ever gets support
for notifying the guest process of a Ctrl-C that happened, this would
have to be done through the guest process polling for the signal, which
will require thread support in WASI too to be compatible with the api
provided by the ctrlc crate.

remove linker wrapper script

Author: bjorn3

comment.txt

@@ -19,7 +19,7 @@ Hello World!
 
 use LLVM
 Install example:
-WASI_SDK_PATH=`pwd`/wasi-sdk-22.0 WASI_SYSROOT=`pwd`/wasi-sdk-22.0/share/wasi-sysroot WASI_CLANG_WRAPPER_LINKER="`pwd`/wrapper_linker_clang++.sh" ./x.py install
+WASI_SDK_PATH=`pwd`/wasi-sdk-22.0 WASI_SYSROOT=`pwd`/wasi-sdk-22.0/share/wasi-sysroot ./x.py install
 
 If you just want to run it, https://github.com/oligamiq/rust_wasm/tree/main/rustc_llvm
 ```

compiler/rustc_driver_impl/Cargo.toml

@@ -5,7 +5,6 @@ edition = "2021"
 
 [dependencies]
 # tidy-alphabetical-start
-ctrlc = "3.4.4"
 rustc_ast = { path = "../rustc_ast" }
 rustc_ast_lowering = { path = "../rustc_ast_lowering" }
 rustc_ast_passes = { path = "../rustc_ast_passes" }
@@ -66,6 +65,9 @@ features = [
     "Win32_System_Diagnostics_Debug",
 ]
 
+[target.'cfg(not(target_family = "wasm"))'.dependencies]
+ctrlc = "3.4.4"
+
 [features]
 # tidy-alphabetical-start
 llvm = ['rustc_interface/llvm']

compiler/rustc_driver_impl/src/lib.rs

@@ -1500,6 +1500,7 @@ pub fn init_logger(early_dcx: &EarlyDiagCtxt, cfg: rustc_log::LoggerConfig) {
 /// Install our usual `ctrlc` handler, which sets [`rustc_const_eval::CTRL_C_RECEIVED`].
 /// Making this handler optional lets tools can install a different handler, if they wish.
 pub fn install_ctrlc_handler() {
+    #[cfg(not(target_family = "wasm"))]
     ctrlc::set_handler(move || {
         // Indicate that we have been signaled to stop. If we were already signaled, exit
         // immediately. In our interpreter loop we try to consult this value often, but if for

compiler/rustc_target/src/spec/targets/wasm32_wasip1_threads.rs

@@ -16,7 +16,7 @@ pub fn target() -> Target {
 
     options.add_pre_link_args(
         LinkerFlavor::WasmLld(Cc::No),
-        &["--import-memory", "--export-memory", "--shared-memory"],
+        &["--import-memory", "--export-memory", "--shared-memory", "-Wl,--max-memory=1073741824", "-lwasi-emulated-mman"],
     );
     options.add_pre_link_args(
         LinkerFlavor::WasmLld(Cc::Yes),
@@ -25,6 +25,8 @@ pub fn target() -> Target {
             "-Wl,--import-memory",
             "-Wl,--export-memory,",
             "-Wl,--shared-memory",
+            "-Wl,--max-memory=1073741824",
+            "-lwasi-emulated-mman",
         ],
     );
 

config.llvm.toml

@@ -32,9 +32,8 @@ sysconfdir = "etc"
 
 [target.'wasm32-wasip1-threads']
 wasi-root = "wasi-sdk-22.0/share/wasi-sysroot"
-# linker = "wasi-sdk-22.0/bin/wasm-ld"
-linker = "./wrapper_linker_clang.sh"
 # codegen-backends = ["cranelift"]
+linker = "wasi-sdk-22.0/bin/clang"
 codegen-backends = ["llvm"]
 
 [target.'x86_64-unknown-linux-gnu']