On Tue, 15 Sep 2020 22:10:13 +0500
Dan Pat <danni...@gmail.com> wrote:

> "testinput.h" file contains "#include "a.h" directive. Changing
> testinput.h results in a generator run followed by a C++ compiler run.
> Changing a.h results in no action, although in this case the generator
> is intended to reprocess its input.

It's expected that the generator won't re-run, because the dependency parsing 
happens when building a cpp file, i.e. all the headers are dependencies of the 
object file, and the header files themselves are only "passed through" by the 
scanning process. Though you might be able to cheat by setting up a dummy cpp 
file that includes the top-level header and making that an input to the 
generator rule.


Christian
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