Generate porting.info in build tree rather than source tree

[Mike Frysinger]

On 28 Oct 2022 17:40, Torbjorn SVENSSON wrote:
> With the recent improvements in the build system by Mike Frysinger, I've 
> noticed a minor regression.

this is not new behavior.  you can check out newlib-4.1.0 which doesn't
contain any of my build changes and it does the same thing.

> When building newlib, the file libgloss/doc/porting.info is always 
> created in the source tree rather than the build tree. Looking at the 
> libgloss/Makefile.* files, it appears that this is derived from the 
> libgloss/doc/Makefile.inc line:
> info_TEXINFOS += %D%/porting.texi
> 
> To my knowledge (no automake wiz...), %D% is a relative path, so I 
> suppose the generated path should not use $(srcdir), yet the Makefile.in 
> does contain $(srcdir)/doc/porting.info.
> 
> Would it be possible to have this porting.info file generated in the 
> build tree rather than the source tree to avoid having the source tree 
> in a dirty state after a build?

this is WAI.  info files are distributed with releases, so it should be
generated in the source tree.  this is documented here:
https://www.gnu.org/prep/standards/html_node/Standard-Targets.html#Standard-Targets
> 'info'
> Normally a GNU distribution comes with Info files, and that means the Info
> files are present in the source directory. Therefore, the Make rule for an
> info file should update it in the source directory. When users build the
> package, ordinarily Make will not update the Info files because they will
> already be up to date.
-mike
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