Merge pull request #8096 from jepler/lto-parallel

Speed LTO builds by using multiple threads

Author: dhalbert

py/circuitpy_defns.mk

@@ -70,7 +70,7 @@ endif
 CIRCUITPY_LTO ?= 0
 CIRCUITPY_LTO_PARTITION ?= balanced
 ifeq ($(CIRCUITPY_LTO),1)
-CFLAGS += -flto -flto-partition=$(CIRCUITPY_LTO_PARTITION) -DCIRCUITPY_LTO=1
+CFLAGS += -flto=jobserver -flto-partition=$(CIRCUITPY_LTO_PARTITION) -DCIRCUITPY_LTO=1
 else
 CFLAGS += -DCIRCUITPY_LTO=0
 endif