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make: use system printf for gpio cdev support tests

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some shells (e.g. dash) don't support the `-e` switch with their
built-in echo for interpreting escape sequences. also, the `-e` switch
is technically not POSIX compliant. so use system (e.g. coreutils,
busybox) printf instead.

resolves #56.
This commit is contained in:
Vanya A. Sergeev
2025-02-28 05:11:37 -06:00
parent 024a25d18e
commit d7d426ea69
1 changed files with 2 additions and 2 deletions
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Makefile
+2 -2
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@@ -11,8 +11,8 @@ TEST_PROGRAMS = $(basename $(wildcard tests/*.c))
OBJECTS = $(patsubst $(SRCDIR)/%.c,$(OBJDIR)/%.o,$(SRCS))
NULL := $(if $(filter Windows_NT,$(OS)),NUL,/dev/null)
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_V1_SUPPORT := $(shell ! env printf "\x23include <linux/gpio.h>\n\x23ifndef GPIO_GET_LINEEVENT_IOCTL\n\x23error\n\x23endif" | $(CC) -E - >$(NULL) 2>&1; echo $$?)
GPIO_CDEV_V2_SUPPORT := $(shell ! env printf "\x23include <linux/gpio.h>\nint main(void) { GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME; return 0; }" | $(CC) -x c - >$(NULL) 2>&1; echo $$?)
GPIO_CDEV_SUPPORT = $(if $(filter 1,$(GPIO_CDEV_V2_SUPPORT)),2,$(if $(filter 1,$(GPIO_CDEV_V1_SUPPORT)),1,0))
COMMIT_ID := $(shell git describe --abbrev --always --tags --dirty 2>$(NULL) || echo "")