OpenE2K/rust
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

bootstrap: build compiler-builtins with -Z emit-stack-sizes

Browse Source
This commit is contained in:
Jorge Aparicio 2019-03-24 17:49:49 +01:00
parent fb5ed488ff
commit 8b8488ce8f
1 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
src/bootstrap/bin/rustc.rs
View File

@ -181,6 +181,30 @@ fn main() {
cmd.arg("-C").arg(format!("debug-assertions={}", debug_assertions));
}
// Build `compiler_builtins` with `-Z emit-stack-sizes` to add stack usage information.
//
// When you use this flag with Cargo you get stack usage information on all crates compiled
// from source, and when you are using LTO you also get information on pre-compiled crates
// like `core` and `std`. However, there's an exception: `compiler_builtins`. This crate
// is special and doesn't participate in LTO because it's always linked as a separate object
// file. Due to this it's impossible to get information about this crate using `RUSTFLAGS`
// + Cargo, or `cargo rustc`.
//
// To make the stack usage information of this crate available to Cargo based stack usage
// analysis tools we compile `compiler_builtins` with the `-Z emit-stack-sizes` flag. The
// flag is known to currently work with targets that produce ELF files so we limit the use
// of the flag to those targets.
//
// NOTE(japaric) if this ever causes problem with an LLVM upgrade or any PR feel free to
// remove it or comment it out
if crate_name == "compiler_builtins"
&& (target.contains("-linux-")
|| target.contains("-none-eabi")
|| target.ends_with("-none-elf"))
{
cmd.arg("-Z").arg("emit-stack-sizes");
}
if let Ok(s) = env::var("RUSTC_CODEGEN_UNITS") {
cmd.arg("-C").arg(format!("codegen-units={}", s));
}