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Fw: "Advanced Auto-Dependency Generation" question

From: Angel Tsankov
Subject: Fw: "Advanced Auto-Dependency Generation" question
Date: Tue, 16 Aug 2005 19:07:44 +0300

----- Original Message ----- From: "Anna Olsson" <address@hidden>
To: <address@hidden>
Sent: Tuesday, August 16, 2005 11:28 AM
Subject: "Advanced Auto-Dependency Generation" question

I've read the "Advanced Auto-Dependency Generation" article - but I'm
wondering about this:
The solution to the second problem (make reports an error when the
dependecy file does not exist) is to make make not care about whether or not dependency files exist. But what if a dependency file is accidentaly deleted? Make doesn't care, but the corresponding target will never be
rebuilt until the corresponding .c file is altered or the .o file is

You could fix this by adding a Rule without Commands or Prerequisites
for any of the dependency files. You also need to add each dependency
file on the list of prerequisites of the respective .o file. This will
trigger rebuild of the object and dependency file if the depenency
file is missing. One can think of this as the penalty for deleting
dependency files :)

Btw, I had to add an empy @echo command in the list of commands of
each dependency file. Otherwise, make 3.80 would not "image" the
missing dependency file is up-to-date as explained in the article you
mention (and in the GNU make manual, as well).

I would consider that to be a serious error! Did I miss something?

No, you didn't!

Angel Tsankov

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