[RFC/PATCH] newlib: enable automatic dependency generation

[Sebastian Huber]

On 17/03/2022 03:16, Mike Frysinger wrote:
> This was disabled as part of the migration away from the cygnus option
> as that implied no-dependencies.
> 
> We currently have 1-to-1 updates enabled -- if you touch a .c file,
> the corresponding .o file will be rebuilt.  But if you touch a header
> file, none of the files using that get rebuilt.
> 
> Not sure how much we care.  I think we want this since it's probably
> what people are expecting.  It increases the size of the Makefile a
> bit, and adds a little build overhead to generate & process.

I think the proper dependency tracking should be enabled. This helps 
everyone doing changes in Newlib. The dependency files generated by GCC 
are also sometimes helpful to figure out what is actually used to build 
a file.

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