bjoernager/rust
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Add -Z no-link flag

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Adds a compiler option to allow rustc compile a crate without linking.
With this flag, rustc serializes codegen_results into a .rlink file.
This commit is contained in:
Victor Ding 2019-12-21 21:37:15 +11:00
parent d1e594f402
commit 6a6ebb4403
11 changed files with 65 additions and 13 deletions
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14
src/librustc_codegen_llvm/lib.rs
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@ -33,6 +33,7 @@ use rustc_codegen_ssa::CompiledModule;
use rustc_errors::{FatalError, Handler};
use std::any::Any;
use std::ffi::CStr;
use std::fs;
use std::sync::Arc;
use syntax::expand::allocator::AllocatorKind;
@ -44,6 +45,7 @@ use rustc::ty::{self, TyCtxt};
use rustc::util::common::ErrorReported;
use rustc_codegen_ssa::ModuleCodegen;
use rustc_codegen_utils::codegen_backend::CodegenBackend;
use rustc_serialize::json;
mod back {
pub mod archive;
@ -298,6 +300,18 @@ impl CodegenBackend for LlvmCodegenBackend {
return Ok(());
}
if sess.opts.debugging_opts.no_link {
// FIXME: use a binary format to encode the `.rlink` file
let rlink_data = json::encode(&codegen_results).map_err(|err| {
sess.fatal(&format!("failed to encode rlink: {}", err));
})?;
let rlink_file = outputs.with_extension("rlink");
fs::write(&rlink_file, rlink_data).map_err(|err| {
sess.fatal(&format!("failed to write file {}: {}", rlink_file.display(), err));
})?;
return Ok(());
}
// Run the linker on any artifacts that resulted from the LLVM run.
// This should produce either a finished executable or library.
sess.time("link_crate", || {