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Patch PRECIOUS and echo #2

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@mgates3 mgates3 commented May 7, 2022

Nice utility. This fixes 2 minor issues. See commits for details.

Nice utility. Here's a minor fix.

# Incorrect behavior, deleting intermediate .dephash files
> make
Updating hash file: .dephash/a1.dephash
cp       a1 b1
rm .dephash/a1.dephash

# Correct behavior, keeping intermediate .dephash files
> make
Updating hash file: .dephash/a1.dephash
cp       a1 b1

> cat Makefile
HASHDEPS_HASH_TREE_DIR := .dephash
-include hashdeps/hashdeps.mk

.DEFAULT_GOAL := b1

b%: $(call hash_deps,a%)
	cp $(call unhash_deps,$<) $@

clean:
	-rm -rf b* .dephash
On macOS, echo -n in sh doesn't work as desired, but /bin/echo -n does.

# Wrong output includes -n. Cf. https://pubs.opengroup.org/onlinepubs/009604599/utilities/echo.html
prompt> echo -n foo
-n foo
prompt> 

# Correct output suppresses trailing newline
prompt> /bin/echo -n foo
fooprompt>
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