[Scons-users] max-drift vs. Decider

[Alexander Tsvetkov]

Then how max-drift=0 different from MD5-timestamp? To my understanding both
will check the timestamp, if the timestamp has changed, both will
recalculate checksums.

On the other hand, the description you pasted clearly says that "a value of
0 means to always use the cached signature". This statement implies all the
changes will be ignored - which is probably the case, but I wonder why one
could want to ignore the changes.




On Sat, Mar 30, 2013 at 9:19 PM, Bill Deegan <bill at baddogconsulting.com>wrote:


>

> Alexander,

>

> From the SCons man page:

> http://www.scons.org/doc/production/HTML/scons-man.html

>  --max-drift=*SECONDS* Set the maximum expected drift in the modification

> time of files to *SECONDS*. This value determines how long a file must be

> unmodified before its cached content signature will be used instead of

> calculating a new content signature (MD5 checksum) of the file's contents.

> The default value is 2 days, which means a file must have a modification

> time of at least two days ago in order to have its cached content signature

> used. A negative value means to never cache the content signature and to

> ignore the cached value if there already is one. A value of 0 means to

> always use the cached signature, no matter how old the file is.

>

>

> -Bill

>

>

>

> On Sat, Mar 30, 2013 at 11:22 AM, Alexander Tsvetkov <xflower at gmail.com>wrote:

>

>>

>> Dear Scons!

>>

>> I'm (unsuccessfully) trying to understand the subtle relationship between

>> max-drift parameter, MD5 decider and MD5-timestamp decider.

>>

>> To be specific, how comes that after setting max-drift=0, changing the

>> file does not cause recompiling?

>>

>> Thank you!

>>

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>>

>

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