Automatic Make variables, part 2 #20
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Check their status using && instead of assuming they succeed. Always execute them in a subshell. Some flavors of make allow all commands to run in the same shell.
$< should only be used in suffix rules for portability. Replace the all-scripts target with targets for each .awk file.
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This contains a few replacements that didn't make it into #17:
$@and$<in the rules (particularly suffix rules), except don't use$<outside of pattern/suffix rules since it isn't portable (a GNU Make extension for the first prerequisite).cd dir; cmdwith(cd dir && cmd).makewith$(MAKE).Three other small changes that help when using these automatic variables:
$@as appropriate. Removes the need totouch all-scriptsto prevent unnecessarily rebuilding these.chmod +xcommands to where the target file is created so these can also use$@..nw.osuffix rule from src/c/Makefile, instead relying on the.nw.crule followed by the usually built-in.c.orule.