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unwind: make build.rs do clean rebuilds #87977

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unwind: make build.rs do clean rebuilds #87977

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14 changes: 11 additions & 3 deletions library/unwind/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -65,8 +65,8 @@ fn main() {
}

mod llvm_libunwind {
use std::env;
use std::path::Path;
use std::path::{Path, PathBuf};
use std::{env, fs, io};

/// Compile the libunwind C/C++ source code.
pub fn compile() {
Expand All @@ -76,6 +76,14 @@ mod llvm_libunwind {
let mut cpp_cfg = cc::Build::new();
let root = Path::new("../../src/llvm-project/libunwind");

// We depend on starting with a fresh build directory each time.
let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
if let Err(x) = fs::remove_dir_all(&out_dir) {
if x.kind() != io::ErrorKind::NotFound {
panic!("Failed removing OUT_DIR at {}: {}", out_dir.display(), x);
}
}

cpp_cfg.cpp(true);
cpp_cfg.cpp_set_stdlib(None);
cpp_cfg.flag("-nostdinc++");
Expand Down Expand Up @@ -137,7 +145,7 @@ mod llvm_libunwind {
"UnwindRegistersSave.S",
];

let cpp_sources = vec!["Unwind-EHABI.cpp", "Unwind-seh.cpp", "libunwind.cpp"];
let cpp_sources = &["Unwind-EHABI.cpp", "Unwind-seh.cpp", "libunwind.cpp"];
let cpp_len = cpp_sources.len();

if target.contains("x86_64-fortanix-unknown-sgx") {
Expand Down