Makefile: replace which(1) with more portable command -v (#6784)

The `which(1)` program is not provided by the POSIX base system and causes the Makefile to misbehave when it is missing on the system. `command -v` is a portable replacement that is provided by the shell as a builtin and that is guaranteed to exist by POSIX.
aio-libs · Jun 12, 2022 · 3a41da0 · 3a41da0
1 parent 944482f
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diff --git a/CHANGES/6784.misc b/CHANGES/6784.misc
@@ -0,0 +1 @@
+Remove the dependency on `which(1)` program in favor of the shell built-in `command -v` whose presence is guaranteed by POSIX.
diff --git a/Makefile b/Makefile
@@ -25,7 +25,7 @@ FORCE:
 # check_sum.py works perfectly fine but slow when called for every file from $(ALLS)
 # (perhaps even several times for each file).
 # That is why much less readable but faster solution exists
-ifneq (, $(shell which sha256sum))
+ifneq (, $(shell command -v sha256sum))
 %.hash: FORCE
 	$(eval $@_ABS := $(abspath $@))
 	$(eval $@_NAME := $($@_ABS))
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Remove the dependency on `which(1)` program in favor of the shell built-in `command -v` whose presence is guaranteed by POSIX.