ef89cc8f04
This commit is an attempted resurrection of #70458 where LLVM bitcode emitted by rustc into rlibs is stored into object file sections rather than in a separate file. The main rationale for doing this is that when rustc emits bitcode it will no longer use a custom compression scheme which makes it both easier to interoperate with existing tools and also cuts down on compile time since this compression isn't happening. The blocker for this in #70458 turned out to be that native linkers didn't handle the new sections well, causing the sections to either trigger bugs in the linker or actually end up in the final linked artifact. This commit attempts to address these issues by ensuring that native linkers ignore the new sections by inserting custom flags with module-level inline assembly. Note that this does not currently change the API of the compiler at all. The pre-existing `-C bitcode-in-rlib` flag is co-opted to indicate whether the bitcode should be present in the object file or not. Finally, note that an important consequence of this commit, which is also one of its primary purposes, is to enable rustc's `-Clto` bitcode loading to load rlibs produced with `-Clinker-plugin-lto`. The goal here is that when you're building with LTO Cargo will tell rustc to skip codegen of all intermediate crates and only generate LLVM IR. Today rustc will generate both object code and LLVM IR, but the object code is later simply thrown away, wastefully.
14 lines
304 B
Rust
14 lines
304 B
Rust
// compile-flags: -C lto=thin
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// aux-build:lto-rustc-loads-linker-plugin.rs
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// run-pass
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// no-prefer-dynamic
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// Same as the adjacent `lto-thin-rustc-loads-linker-plugin.rs` test, only with
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// ThinLTO.
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extern crate lto_rustc_loads_linker_plugin;
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fn main() {
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lto_rustc_loads_linker_plugin::foo();
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}
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