esp-idf/components/esp_event/component.mk

#
# Component Makefile
#
COMPONENT_ADD_INCLUDEDIRS := include
COMPONENT_PRIV_INCLUDEDIRS := private_include
COMPONENT_SRCDIRS := .

ifdef CONFIG_EVENT_LOOP_PROFILING
	PROFILING_ENABLED := 1
else
	PROFILING_ENABLED := 0
endif

ifeq ($(and $(GCC_NOT_5_2_0),$(PROFILING_ENABLED)), 1)
# uses C11 atomic feature
esp_event.o: CFLAGS += -std=gnu11
endif