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Enhance makefile portability #55

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Enhance makefile portability #55

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12 changes: 9 additions & 3 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -10,11 +10,17 @@ TEST_PROGRAMS = $(basename $(wildcard tests/*.c))

OBJECTS = $(patsubst $(SRCDIR)/%.c,$(OBJDIR)/%.o,$(SRCS))

GPIO_CDEV_V1_SUPPORT := $(shell ! echo -e "#include <linux/gpio.h>\n#ifndef GPIO_GET_LINEEVENT_IOCTL\n#error\n#endif" | $(CC) -E - >/dev/null 2>&1; echo $$?)
GPIO_CDEV_V2_SUPPORT := $(shell ! echo -e "#include <linux/gpio.h>\nint main(void) { GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME; return 0; }" | $(CC) -x c - >/dev/null 2>&1; echo $$?)
ifeq ($(OS),Windows_NT)
NULL := NUL
else
NULL := /dev/null
endif

GPIO_CDEV_V1_SUPPORT := $(shell ! echo -e "\x23include <linux/gpio.h>\n\x23ifndef GPIO_GET_LINEEVENT_IOCTL\n\x23error\n\x23endif" | $(CC) -E - >$(NULL) 2>&1; echo $$?)
GPIO_CDEV_V2_SUPPORT := $(shell ! echo -e "\x23include <linux/gpio.h>\nint main(void) { GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME; return 0; }" | $(CC) -x c - >$(NULL) 2>&1; echo $$?)
GPIO_CDEV_SUPPORT = $(if $(filter 1,$(GPIO_CDEV_V2_SUPPORT)),2,$(if $(filter 1,$(GPIO_CDEV_V1_SUPPORT)),1,0))

COMMIT_ID := $(shell git describe --abbrev --always --tags --dirty 2>/dev/null || echo "")
COMMIT_ID := $(shell git describe --abbrev --always --tags --dirty 2>$(NULL) || echo "")

OPT ?= -O3
CFLAGS += -std=gnu99 -pedantic
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