Allow to override rust LTO flag

Gbp-Pq: Topic debian-hacks
Gbp-Pq: Name Allow-to-override-rust-LTO-flag.patch

diff --git a/config/makefiles/rust.mk b/config/makefiles/rust.mk
index 524bc436fdf361a0f6bca339393392786efe070c..d97b94c495e31244d8c57c31179957a5464510fe 100644 (file)
--- a/config/makefiles/rust.mk
+++ b/config/makefiles/rust.mk
@@ -92,8 +92,9 @@ ifndef rustflags_sancov
 # Never enable when coverage is enabled to work around https://github.com/rust-lang/rust/issues/90045.
 ifndef MOZ_CODE_COVERAGE
 ifeq (,$(findstring gkrust_gtest,$(RUST_LIBRARY_FILE)))
-cargo_rustc_flags += -Clto$(if $(filter full,$(MOZ_LTO_RUST_CROSS)),=fat)
+cargo_rustc_flags += $(or $(DEBIAN_RUST_LTO),-Clto$(if $(filter full,$(MOZ_LTO_RUST_CROSS)),=fat))
 endif
+ifneq (-Clto=off,$(DEBIAN_RUST_LTO))
 # We need -Cembed-bitcode=yes for all crates when using -Clto.
 RUSTFLAGS += -Cembed-bitcode=yes
 endif
@@ -101,6 +102,7 @@ endif
 endif
 endif
 endif
+endif
 
 ifdef CARGO_INCREMENTAL
 export CARGO_INCREMENTAL