Re: mtime of installed files

[ludo@gnu.org (Ludovic Courtès)]

Hello!

Ralf Wildenhues <Ralf.Wildenhues@gmx.de> writes:

> Now I need to ask in more detail: do you actually need "newer" or just
> "not older"?  Because if the latter, then you could just let the rule to
> install $(nodist_foobar_DATA) depend on the rule to install
> $(dist_foobar_SOURCES), the latter of which I assume you still need to
> write, and hook to install-data-local.  Or you do something like
>   mod_DATA = $(dist_foobar_SOURCES)
>   ccache_DATA = $(nodist_foobar_DATA)
>
> The install rules then still have internal names
> (install-nodist_foobarDATA or install-ccacheDATA or so) but at least the
> right thing happens, as long as the same $(INSTALL_DATA) command is used
> in both cases.
>
> And if you need "newer" then you could "sleep 1" as last bit of your
> hand-written rule to install $(dist_foobar_SOURCES), or let the
> install-ccacheDATA depend on a guile-install-sleep helper rule which
> itself depends on the install-nodist_foobarDATA rule or so.
> However, that doesn't help you when "install -C" is used.
>
> Now, there's one more technical complication for adding the dependency:
> automake will not put out its own install-ccacheDATA rule if you use it
> as target anywhere (on the grounds that it's the only method to override
> an automake-provided target), which you don't want here; you can trick
> automake by assigning the name to some variable though:
>   guile_install_ccacheDATA = install-ccacheDATA
>   $(guile_install_ccacheDATA): install-modDATA

For the record, this was fixed along these lines.  The auto-compile
mtime checks were also changed to checked for >= instead of ==:

  http://git.savannah.gnu.org/cgit/guile.git/commit/?id=fefd60ba4ba751712c45c95362bbc2f858890678

Ralf: can you formally state that the rule names (‘install-ccacheDATA’,
etc.) are not going to change?  :-)

Thank you!

Ludo’.