Re: generated version numbers

[Peter Johansson]

On 02/27/2014 04:47 AM, Harlan Stenn wrote:
> So while the filestamps are technically correct, the generated Makefile
> *will*  see that version.m4 is newer than config.h.in and regenerate it
> via Makefile dependencies.
>
> I suspect the answer is that at the end of the bootstrap script, if the
> aclocal.m4 file is newer than the config.h.in file we need to touch
> the config.h.in file.
Hi Harlan

File 'config.h.in' is generated by autoheader [I assume]. Autoheader 
will not touch the time-stamp of 'config.h.in' if the content doesn't 
change. This can be annoying, and is the reason Automake generated rule 
has a 'touch $@' after autoheader is called

$(srcdir)/config.h.in:  $(am__configure_deps)
    ($(am__cd) $(top_srcdir) && $(AUTOHEADER))
    rm -f stamp-h1
    touch $@

In my bootstrap script I issue autoreconf with option '--force', so I 
don't see this problem. If you think that is too expensive, you could 
set environment
variable AUTOHEADER with something like:

AUTOHEADER="autoheader -f" autoreconf -vi

Changing the behaviour of autoheader, I suspect will be met by some 
significant resistance.


Cheers,

--
Peter Johansson