bjoernager/rust
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thinlto: only build summary file if needed

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If we don't do this, some versions of LLVM (at least 17, experimentally)
will double-emit some error messages, which is how I noticed this. Given
that it seems to be costing some extra work, let's only request the
summary bitcode production if we'll actually bother writing it down,
otherwise skip it.
This commit is contained in:
Augie Fackler 2024-05-23 14:58:30 -04:00
parent 03d5556ced
commit de8200c5a4
7 changed files with 17 additions and 14 deletions
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2
compiler/rustc_codegen_ssa/src/back/write.rs
View file

@ -891,7 +891,7 @@ fn execute_optimize_work_item<B: ExtraBackendMethods>(
match lto_type {
ComputedLtoType::No => finish_intra_module_work(cgcx, module, module_config),
ComputedLtoType::Thin => {
let (name, thin_buffer) = B::prepare_thin(module);
let (name, thin_buffer) = B::prepare_thin(module, false);
if let Some(path) = bitcode {
fs::write(&path, thin_buffer.data()).unwrap_or_else(|e| {
panic!("Error writing pre-lto-bitcode file `{}`: {}", path.display(), e);

2
compiler/rustc_codegen_ssa/src/traits/write.rs
View file

@ -56,7 +56,7 @@ pub trait WriteBackendMethods: 'static + Sized + Clone {
module: ModuleCodegen<Self::Module>,
config: &ModuleConfig,
) -> Result<CompiledModule, FatalError>;
fn prepare_thin(module: ModuleCodegen<Self::Module>) -> (String, Self::ThinBuffer);
fn prepare_thin(module: ModuleCodegen<Self::Module>, want_summary: bool) -> (String, Self::ThinBuffer);
fn serialize_module(module: ModuleCodegen<Self::Module>) -> (String, Self::ModuleBuffer);
}