Re: Aw: git equivalent to pulling the most recent date from ChangeLog?

[sfeam <sf...@us...>]

On Monday, 25 December 2017 22:08:24 Bastian Märkisch wrote:
> > Building from git tip fails to insert a valid date into
> > the "last modified" field.   This used to be pulled from the
> > top of ChangeLog and inserted into timestamp.h but that 
> > mechanism does not track the date of git commits.
> 
> That might do the trick:
>   git log -1 --format=%ci | cut -b-10
> 
>   Bastian

That looks promising.
Can someone wrap that in the appropriate Makefile syntax to
substitute for the rule currently in src/Makefile.am?

timestamp.h: $(top_srcdir)/ChangeLog Makefile
        @echo Making $@
        @echo "#ifndef GNUPLOT_TIMEBASE_H_INCLUDED" >$@t
        @echo "#define GNUPLOT_TIMEBASE_H_INCLUDED" >>$@t
        @head -1 $< | sed -e 's,\(^[0-9-]* \).*$$,const char gnuplot_date[] = "\1";,' >>$@t
        @echo "#endif /* GNUPLOT_TIMEBASE_H_INCLUDED */" >> $@t
        @if cmp -s $@ $@t; then rm -f $@t; else mv $@t $@; fi



I suppose the dependency rule would become something like

timestamp.h: $(top_srcdir)/.git/objects Makefile

but how does one get "make" to track the change status of .git/objects ?

	Ethan