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Re: About libtool supporting parallel "make install"

From: Ralf Wildenhues
Subject: Re: About libtool supporting parallel "make install"
Date: Fri, 18 Mar 2011 07:40:07 +0100
User-agent: Mutt/1.5.20 (2010-08-04)

* Dan Nicholson wrote on Thu, Mar 17, 2011 at 11:47:38PM CET:
> On Thu, Mar 17, 2011 at 3:08 AM, Pacho Ramos <address@hidden> wrote:
> >
> This seems more legitimate. I looked at the's and they
> look reasonable to me. You have two libraries, one is in
> lib_LTLIBRARIES and the other is in pkglib_LTLIBRARIES. The pkglib one
> depends on the lib one.
> It seems that make is running install-libLTLIBRARIES and
> install-pkglibLTLIBRARIES in parallel. Each one of these these rules
> installs the libraries serially in a loop. However, if libtool is
> relinking the libraries, it really needs to wait until the
> prerequisite libraries from _other_ rules are installed. I'd bet if
> you do this:
> echo "install-pkglibLTLIBRARIES: install-libLTLIBRARIES" >>
> src/backend/xml/Makefile
> it will work again. This seems like a bug in automake's libtool
> support to me, but I don't know how to fix it.

Yes, it's a bug in Automake/Libtool, but the workaround isn't quite
correct: you'd need something like

install-pkglibLTLIBRARIES = install-pkglibLTLIBRARIES
$(install-pkglibLTLIBRARIES): install-libLTLIBRARIES

because your proposed workaround will cause automake to not emit its
install-pkglibLTLIBRARIES rule at all.  Yes, depending on automake not
seeing through variables when determining target names is ugly, I know.
(It's also so widespread by now that we can't easily change that issue.)

I've posted some ideas to fix the original bug before, on an automake or
libtool list; but nothing finished.  :-/


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