8000 nrf/Makefile: Enable LTO by default only on newer gcc. · micropython/micropython@cca1e08 · GitHub
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nrf/Makefile: Enable LTO by default only on newer gcc.
Older gcc/binutils linker does not support lto with wrap. Signed-off-by: Andrew Leech <andrew@alelec.net>
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‎ports/nrf/Makefile

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@@ -129,7 +129,15 @@ CFLAGS_MCU_m4 = $(CFLAGS_CORTEX_M) -mtune=cortex-m4 -mcpu=cortex-m4 -mfpu=fpv4-s
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CFLAGS_MCU_m0 = $(CFLAGS_CORTEX_M) -fshort-enums -mtune=cortex-m0 -mcpu=cortex-m0 -mfloat-abi=soft
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# linker wrap does not work with lto on older gcc/binutils: https://sourceware.org/bugzilla/show_bug.cgi?id=24406
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GCC_VERSION = $(shell arm-none-eabi-gcc --version | sed -n -E 's:^arm.*([0-9]+\.[0-9]+\.[0-9]+).*$$:\1:p')
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GCC_MAJOR_VERS = $(word 1,$(subst ., ,$(GCC_VERSION)))
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ifeq ($(shell test $(GCC_MAJOR_VERS) -ge 10; echo $$?),0)
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LTO ?= 1
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else
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LTO ?= 0
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endif
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ifeq ($(LTO),1)
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CFLAGS += -flto
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else

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