This might increase build and lto times a bit,
but may result in faster and better optimized result.
It also honors resource limits properly.

Signed-off-by: Georgy Yakovlev <gyakovlev@gentoo.org>
---
eclass/cargo.eclass | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/eclass/cargo.eclass b/eclass/cargo.eclass
index a7c7bffd3c0c..00b8078f80ea 100644
--- a/eclass/cargo.eclass
+++ b/eclass/cargo.eclass
@@ -279,6 +279,11 @@ cargo_gen_config() {
$(usex debug 'opt-level = 0' '')
$(usex debug 'lto = false' '')

+ # https://doc.rust-lang.org/rustc/codegen-options/index.html#codegen-units
+ # We use single codegen unit for most optimized code and to honor -j from MAKEOPTS.
+ # Users can override via e.g. CARGO_PROFILE_gentoo_CODEGEN_UNITS="16" in make.conf.
+ codegen-units = 1
+
[build]
jobs = $(makeopts_jobs)
incremental = false
--
2.39.1

--- SoupGate-Win32 v1.05
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