[Scons-users] What to do when scanner is invoked for non-existing file?

[Ilya]

On 03/01/2014 02:37 AM, Dirk Bächle wrote:

> Hi Ilya,

>

> On 28.02.2014 23:18, Ilya wrote:

>> Hello,

>>

>> SCons manual in "Scanner Objects" section says the following:

>>

>>> Note that the file is not guaranteed to exist before the scanner is

>>> called, so the scanner function should check that if there's any

>>> chance that the scanned file might not exist (for example, if it's

>>> built from other files).

>>

>> I have two questions about this:

>> 1. What to do if such condition is detected? Is returning an empty list

>> sufficient?

>

> yes, this is the best you can do in such a situation.

>

>> 2. Is scanner supposed to be called again once file is created?

>>

>

> Yes, during the build phase, files can get scanned several times. In 

> fact, whenever source files get created by a builder, all internally 

> cached info about implicit dependencies gets reset (for any remaining 

> nodes!). As soon as one of these File nodes is visited again by the 

> Taskmaster, it should get rescanned.

>

> Best regards,

>

> Dirk

>

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Hi Dirk,

Thanks for the quick answer!

Ilya