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Enable link-time optimization by default #253

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merged 1 commit into from
Oct 28, 2023
Merged

Enable link-time optimization by default #253

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24 changes: 23 additions & 1 deletion Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,28 @@ CFLAGS += -D DEFAULT_STACK_ADDR=0xFFFFE000
# Set the default args starting address
CFLAGS += -D DEFAULT_ARGS_ADDR=0xFFFFF000

# Enable link-time optimization (LTO)
ENABLE_LTO ?= 1
ifeq ($(call has, LTO), 1)
ifeq ("$(CC_IS_CLANG)$(CC_IS_GCC)",)
$(warning LTO is only supported in clang and gcc.)
override ENABLE_LTO := 0
endif
endif
$(call set-feature, LTO)
ifeq ($(call has, LTO), 1)
ifeq ("$(CC_IS_GCC)", "1")
CFLAGS += -flto
endif
ifeq ("$(CC_IS_CLANG)", "1")
CFLAGS += -flto=thin -fsplit-lto-unit
LDFLAGS += -flto=thin
endif
endif

# Disable Intel's Control-flow Enforcement Technology (CET)
CFLAGS += $(CFLAGS_NO_CET)

OBJS_EXT :=

# Control and Status Register (CSR)
Expand Down Expand Up @@ -90,7 +112,7 @@ endif

# For tail-call elimination, we need a specific set of build flags applied.
# FIXME: On macOS + Apple Silicon, -fno-stack-protector might have a negative impact.
$(OUT)/emulate.o: CFLAGS += $(CFLAGS_NO_CET) -foptimize-sibling-calls -fomit-frame-pointer -fno-stack-check -fno-stack-protector
$(OUT)/emulate.o: CFLAGS += -foptimize-sibling-calls -fomit-frame-pointer -fno-stack-check -fno-stack-protector

# Clear the .DEFAULT_GOAL special variable, so that the following turns
# to the first target after .DEFAULT_GOAL is not set.
Expand Down