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Allow turning off LTO #673

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Allow turning off LTO #673

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15 changes: 11 additions & 4 deletions Arduino.mk
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Original file line number Diff line number Diff line change
Expand Up @@ -1243,13 +1243,20 @@ CXXFLAGS += -fpermissive -fno-exceptions $(CXXFLAGS_STD)
ASFLAGS += -x assembler-with-cpp
DIAGNOSTICS_COLOR_WHEN ?= always

LTO ?= y
# Flags for AVR
ifeq ($(findstring avr, $(strip $(CC_NAME))), avr)
ifeq ($(shell expr $(CC_VERNUM) '>' 490), 1)
ASFLAGS += -flto
CXXFLAGS += -fno-threadsafe-statics -flto -fno-devirtualize -fdiagnostics-color=$(DIAGNOSTICS_COLOR_WHEN)
CFLAGS += -flto -fno-fat-lto-objects -fdiagnostics-color=$(DIAGNOSTICS_COLOR_WHEN)
LDFLAGS += -flto -fuse-linker-plugin
ifeq ($(LTO), y)
LTO_ASFLAGS = -flto
LTO_CXXFLAGS = -flto
LTO_CFLAGS = -flto -fno-fat-lto-objects
LTO_LDFLAGS = -flto
endif
ASFLAGS += $(LTO_ASFLAGS)
CXXFLAGS += -fno-threadsafe-statics $(LTO_CXXFLAGS) -fno-devirtualize -fdiagnostics-color=$(DIAGNOSTICS_COLOR_WHEN)
CFLAGS += $(LTO_CFLAGS) -fdiagnostics-color=$(DIAGNOSTICS_COLOR_WHEN)
LDFLAGS += $(LTO_LDFLAGS) -fuse-linker-plugin
endif
# Flags for ARM (most set in Sam.mk)
else
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