[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: Strange behaviour in libtool-1.5.20

From: Пухальский Юрий Андреевич
Subject: RE: Strange behaviour in libtool-1.5.20
Date: Tue, 6 Sep 2005 10:52:57 +0400

> Oh, libtool recognizes this option fine.  It's Automake that forbids you
> to use it in *_LDFLAGS, because it adds a "-o liba.la" itself!
Actually it doesn't forbid. This option is added nicely to the command line a 
bit later, so the latter will look something like:
... -o liba.la ... -o la.o ...
So no problem with it, the problem (and with your approach as well), that there 
is no convenient way to install/uninstall the resulting object. But well, it's 
not the main problem, the main problem is that I cannot build this object at 

> Just write the rule yourself, like this:
> la_o_deps = a.lo b.lo
> la.o: $(la_o_deps)
>         --mode=link $(CC) $(AM_CFLAGS) $(CFLAGS) $(LDFLAGS) -o $@
> $(la_o_deps)
It (of course) doesn't work either (with --disable-shared). 
Actually, the line:
libtool --tag=CC   --mode=link gcc  -g -O2  -o la.o a.lo libb.la
doesn't work, when we are configured with --disable-shared. The a.o object gets 
That's what I wrote before. 

> > Then I had to make a kernel module for Solaris, which is in fact
> > partially linked object too, and I wondered whether I can specify
> > additional linker flags to it (it turned out, that I cannot specify
> > any, because partial linking is considered unportable). Now I just
> > wonder what this feature is for:)))
> Well, it's not too unportable, many systems have it in one way or
> another.  It's just not very useful either, except to work around
It's very useful to simplify the Makefiles. I ought to use the following 
workaround, which is ugly as hell:
libipsec.la: $(libipsec_la_OBJECTS) $(libipsec_la_DEPENDENCIES)
       @LD@ -r -o ipsec.o `echo $(libipsec_la_OBJECTS)|sed "s/\.lo/\.o/g"` 
`echo $(libipsec_la_LIBADD)|sed "s#lib\([^.]*\)\.la#.libs/lib\1\.a#g"`

Because I must use the same set of objects, although not from .libs/, but from 
./ directory. And I'm restricted to use the convenience libraries being 
compiled in this directory. I cannot use nested libraries, because the 
dependencies are stored in .la file (either I must parse it... recursively..., 
etc.) Which destroys the main goal of libtool - convenience.
Everything would work well - I use libtoolized Makefiles to build everything, 
and in one place I build a kernel module - if I could only make partially 
linked object from normal objects.

> command line length limits.  And for this, libtool also has -objectlist
> as a counter-measure.
> Does this help you?
Not yet:)

reply via email to

[Prev in Thread] Current Thread [Next in Thread]