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-rw-r--r--Makefile.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile.in b/Makefile.in
index 3d042e33..988f56a6 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -14,7 +14,7 @@ CFG_INFO := $(info cfg: building on $(CFG_OSTYPE) $(CFG_CPUTYPE))
CFG_GCC_CFLAGS :=
CFG_GCC_LINK_FLAGS :=
CFG_BOOT_FLAGS := $(BOOT_FLAGS)
-CFG_RUSTC_FLAGS := -nowarn
+CFG_RUSTC_FLAGS := -nowarn -O
# On Darwin, we need to run dsymutil so the debugging information ends
# up in the right place. On other platforms, it automatically gets