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cpu/cortexm_common: enable LTO by default #14795

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cpu/cortexm_common: enable LTO by default #14795

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5dd8d89
makefiles/cflags.inc.mk: remove LTO warning
benpicco Aug 19, 2020
4a40535
cpu/cortexm_common: enable LTO by default
benpicco Aug 19, 2020
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3 changes: 3 additions & 0 deletions makefiles/arch/cortexm.inc.mk
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Expand Up @@ -9,6 +9,9 @@ TARGET_ARCH ?= arm-none-eabi
CFLAGS_CPU = -mcpu=$(MCPU) -mlittle-endian -mthumb $(CFLAGS_FPU)

ifneq (llvm,$(TOOLCHAIN))
# enable LTO by default
LTO ?= 1

# Clang (observed with v3.7) does not understand -mno-thumb-interwork, only add if
# not building with LLVM
CFLAGS += -mno-thumb-interwork
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1 change: 0 additions & 1 deletion makefiles/cflags.inc.mk
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Expand Up @@ -30,7 +30,6 @@ CXXUWFLAGS += -std=%
CXXUWFLAGS += -Wstrict-prototypes -Wold-style-definition

ifeq ($(LTO),1)
$(warning Building with Link-Time-Optimizations is currently an experimental feature. Expect broken binaries.)
LTOFLAGS = -flto
LINKFLAGS += $(LTOFLAGS)
endif
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