[Scons-users] Emitters vs. Scanners

[Plunket, Tom]

I am struggling with an issue where an intermediate file is getting scanned for targets even though it is about to get regenerated.  I'm curious if I need to change my Scanner into an Emitter or if there's something else I should be considering?

The flow is A->B->C, A is the input file which creates B. B is the primary source for C but (B) also lists a bunch of other files that need to go into C.  filename.a gets processed into filename.b and that, along with the results of the scan get bundled up into filename.c. The closest software construction analogy would be that A is like a "premake" or "makefile.in" file, B would be the makefile and would list the source files to be compiled, and C is the executable that results.

If B exists, it gets scanned during dependency generation by the scanner, even if A has changed. This is a problem if B refers to invalid or otherwise broken dependencies that have been fixed by the changes to A, since I will not be able to build nor clean these items without manually deleting B.

I'm looking at https://bitbucket.org/scons/scons/wiki/DynamicSourceGenerator but I'm not yet sure that it'll fix my problem (or maybe it's overkill) since B exists, it just needs to get recreated before getting scanned. (Could/should it be considered a deficiency to scan a file that's scheduled for replacement in the first place?)

Thanks and sorry for the corporate junk that the email gateway sticks on the end of this message.

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