Initial wasm support

crates/lld-sys/Cargo.toml

@@ -1,12 +1,11 @@
 [package]
 name = "lld-sys"
-version.workspace = true
-license.workspace = true
-edition.workspace = true
-repository.workspace = true
-authors.workspace = true
+version = "0.1.0"
+edition = "2021"
 build = "build.rs"
-description = "bindings for ld.lld core"
+
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 libc = { workspace = true }

crates/lld-sys/build.rs

@@ -1,5 +1,19 @@
-fn llvm_config(arg: &str) -> String {
-    let output = std::process::Command::new("llvm-config")
+use std::{
+    env,
+    path::{Path, PathBuf},
+};
+
+const LLVM_LINK_PREFIX: &str = "LLVM_LINK_PREFIX";
+
+fn locate_llvm_config() -> PathBuf {
+    let prefix = env::var_os(LLVM_LINK_PREFIX)
+        .map(|p| PathBuf::from(p).join("bin"))
+        .unwrap_or_default();
+    prefix.join("llvm-config")
+}
+
+fn llvm_config(llvm_config_path: &Path, arg: &str) -> String {
+    let output = std::process::Command::new(llvm_config_path)
         .args([arg])
         .output()
         .unwrap_or_else(|_| panic!("`llvm-config {arg}` failed"));
@@ -8,8 +22,11 @@ fn llvm_config(arg: &str) -> String {
         .unwrap_or_else(|_| panic!("output of `llvm-config {arg}` should be utf8"))
 }
 
-fn set_rustc_link_flags() {
-    println!("cargo:rustc-link-search=native={}", llvm_config("--libdir"));
+fn set_rustc_link_flags(llvm_config_path: &Path) {
+    println!(
+        "cargo:rustc-link-search=native={}",
+        llvm_config(llvm_config_path, "--libdir")
+    );
 
     for lib in [
         "lldELF",
@@ -22,6 +39,90 @@ fn set_rustc_link_flags() {
         "LLVMTargetParser",
         "LLVMBinaryFormat",
         "LLVMDemangle",
+        // Required by `llvm-sys`
+        "LLVMWindowsManifest",
+        "LLVMXRay",
+        "LLVMLibDriver",
+        "LLVMDlltoolDriver",
+        "LLVMTextAPIBinaryReader",
+        "LLVMCoverage",
+        "LLVMLineEditor",
+        "LLVMRISCVTargetMCA",
+        "LLVMRISCVDisassembler",
+        "LLVMRISCVAsmParser",
+        "LLVMRISCVCodeGen",
+        "LLVMRISCVDesc",
+        "LLVMRISCVInfo",
+        "LLVMOrcDebugging",
+        "LLVMOrcJIT",
+        "LLVMWindowsDriver",
+        "LLVMMCJIT",
+        "LLVMJITLink",
+        "LLVMInterpreter",
+        "LLVMExecutionEngine",
+        "LLVMRuntimeDyld",
+        "LLVMOrcTargetProcess",
+        "LLVMOrcShared",
+        "LLVMDWP",
+        "LLVMDebugInfoLogicalView",
+        "LLVMDebugInfoGSYM",
+        "LLVMOption",
+        "LLVMObjectYAML",
+        "LLVMObjCopy",
+        "LLVMMCA",
+        "LLVMMCDisassembler",
+        "LLVMPasses",
+        "LLVMHipStdPar",
+        "LLVMCFGuard",
+        "LLVMCoroutines",
+        "LLVMipo",
+        "LLVMVectorize",
+        "LLVMInstrumentation",
+        "LLVMFrontendOpenMP",
+        "LLVMFrontendOffloading",
+        "LLVMFrontendOpenACC",
+        "LLVMFrontendHLSL",
+        "LLVMFrontendDriver",
+        "LLVMExtensions",
+        "LLVMDWARFLinkerParallel",
+        "LLVMDWARFLinkerClassic",
+        "LLVMDWARFLinker",
+        "LLVMGlobalISel",
+        "LLVMMIRParser",
+        "LLVMAsmPrinter",
+        "LLVMSelectionDAG",
+        "LLVMCodeGen",
+        "LLVMTarget",
+        "LLVMObjCARCOpts",
+        "LLVMCodeGenTypes",
+        "LLVMIRPrinter",
+        "LLVMInterfaceStub",
+        "LLVMFileCheck",
+        "LLVMFuzzMutate",
+        "LLVMScalarOpts",
+        "LLVMInstCombine",
+        "LLVMAggressiveInstCombine",
+        "LLVMTransformUtils",
+        "LLVMBitWriter",
+        "LLVMAnalysis",
+        "LLVMProfileData",
+        "LLVMSymbolize",
+        "LLVMDebugInfoBTF",
+        "LLVMDebugInfoPDB",
+        "LLVMDebugInfoMSF",
+        "LLVMDebugInfoDWARF",
+        "LLVMObject",
+        "LLVMTextAPI",
+        "LLVMMCParser",
+        "LLVMIRReader",
+        "LLVMAsmParser",
+        "LLVMMC",
+        "LLVMDebugInfoCodeView",
+        "LLVMBitReader",
+        "LLVMFuzzerCLI",
+        "LLVMRemarks",
+        "LLVMBitstreamReader",
+        "LLVMTableGen",
     ] {
         println!("cargo:rustc-link-lib=static={lib}");
     }
@@ -34,7 +135,11 @@ fn set_rustc_link_flags() {
 }
 
 fn main() {
-    llvm_config("--cxxflags")
+    println!("cargo:rerun-if-env-changed={}", LLVM_LINK_PREFIX);
+
+    let llvm_config_path = locate_llvm_config();
+
+    llvm_config(&llvm_config_path, "--cxxflags")
         .split_whitespace()
         .fold(&mut cc::Build::new(), |builder, flag| builder.flag(flag))
         .flag("-Wno-unused-parameter")
@@ -42,7 +147,7 @@ fn main() {
         .file("src/linker.cpp")
         .compile("liblinker.a");
 
-    set_rustc_link_flags();
+    set_rustc_link_flags(&llvm_config_path);
 
     println!("cargo:rerun-if-changed=build.rs");
 }