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use std::env;
include!("src/dist/triple.rs");
fn from_build() -> Result<PartialTargetTriple, String> {
let triple = if let Ok(triple) = env::var("RUSTUP_OVERRIDE_BUILD_TRIPLE") {
triple
} else {
env::var("TARGET").unwrap()
};
PartialTargetTriple::new(&triple).ok_or(triple)
}
fn main() {
println!("cargo:rerun-if-env-changed=RUSTUP_OVERRIDE_BUILD_TRIPLE");
println!("cargo:rerun-if-env-changed=TARGET");
match from_build() {
Ok(triple) => eprintln!("Computed build based partial target triple: {triple:#?}"),
Err(s) => {
eprintln!("Unable to parse target '{s}' as a PartialTargetTriple");
eprintln!(
"If you are attempting to bootstrap a new target you may need to adjust the\n\
permitted values found in src/dist/triple.rs"
);
std::process::abort();
}
}
let target = env::var("TARGET").unwrap();
println!("cargo:rustc-env=TARGET={target}");
// Set linker options specific to Windows MSVC.
let target_os = env::var("CARGO_CFG_TARGET_OS");
let target_env = env::var("CARGO_CFG_TARGET_ENV");
if !(target_os.as_deref() == Ok("windows") && target_env.as_deref() == Ok("msvc")) {
return;
}
// # Only search system32 for DLLs
//
// This applies to DLLs loaded at load time. However, this setting is ignored
// before Windows 10 RS1 (aka 1601).
// https://learn.microsoft.com/en-us/cpp/build/reference/dependentloadflag?view=msvc-170
println!("cargo:cargo:rustc-link-arg-bin=rustup-init=/DEPENDENTLOADFLAG:0x800");
// # Delay load
//
// Delay load dlls that are not "known DLLs"[1].
// Known DLLs are always loaded from the system directory whereas other DLLs
// are loaded from the application directory. By delay loading the latter
// we can ensure they are instead loaded from the system directory.
// [1]: https://learn.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-search-order#factors-that-affect-searching
//
// This will work on all supported Windows versions but it relies on
// us using `SetDefaultDllDirectories` before any libraries are loaded.
// See also: src/bin/rustup-init.rs
let delay_load_dlls = ["bcrypt", "powrprof", "secur32"];
for dll in delay_load_dlls {
println!("cargo:rustc-link-arg-bin=rustup-init=/delayload:{dll}.dll");
}
// When using delayload, it's necessary to also link delayimp.lib
// https://learn.microsoft.com/en-us/cpp/build/reference/dependentloadflag?view=msvc-170
println!("cargo:rustc-link-arg-bin=rustup-init=delayimp.lib");
// # Turn linker warnings into errors
//
// Rust hides linker warnings meaning mistakes may go unnoticed.
// Turning them into errors forces them to be displayed (and the build to fail).
// If we do want to ignore specific warnings then `/IGNORE:` should be used.
println!("cargo:cargo:rustc-link-arg-bin=rustup-init=/WX");
}
|
