apenwarr-redo/t/stamp/usestamp.do

redo-ifchange stampy
echo $$ >>usestamp.log
cat stampy
Half-support for using file checksums instead of stamps. A new redo-stamp program takes whatever you give it as stdin and uses it to calculate a checksum for the current target. If that checksum is the same as last time, then we consider the target to be unchanged, and we set checked_runid and stamp, but leave changed_runid alone. That will make future callers of redo-ifchange see this target as unmodified. However, this is only "half" support because by the time we run the .do script that calls redo-stamp, it's too late; the caller is a dependant of the stamped program, which is already being rebuilt, even if redo-stamp turns out to say that this target is unchanged. The other half is coming up. 2010-12-11 02:17:51 -08:00			`redo-ifchange stampy`
			`echo $$ >>usestamp.log`
			`cat stampy`