[RFC/PATCH] newlib: enable automatic dependency generation

[RFC/PATCH] newlib: enable automatic dependency generation

[Mike Frysinger]

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.
---
 newlib/Makefile.in  | 38502 ++++++++++++++++++++++++++++++++++--------
 newlib/acinclude.m4 |     2 +-
 newlib/aclocal.m4   |   316 +
 newlib/configure    |   442 +
 4 files changed, 32111 insertions(+), 7151 deletions(-)

diff --git a/newlib/acinclude.m4 b/newlib/acinclude.m4
index 424460dc76a8..9e4834987716 100644
--- a/newlib/acinclude.m4
+++ b/newlib/acinclude.m4
@@ -114,7 +114,7 @@ AC_SUBST(abs_newlib_basedir)
 
 AC_CANONICAL_HOST
 
-AM_INIT_AUTOMAKE([foreign no-installinfo no-dependencies no-dist no-define subdir-objects 1.15.1])
+AM_INIT_AUTOMAKE([foreign no-installinfo no-dist no-define subdir-objects 1.15.1])
 AM_MAINTAINER_MODE
 AM_SILENT_RULES(yes)
 
-- 
2.34.1

Re: [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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Re: [RFC/PATCH] newlib: enable automatic dependency generation

[Corinna Vinschen]

On Mar 17 07:25, Sebastian Huber wrote:
> 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.

Right, we want that.


Corinna