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Re: Trouble controlling linking if many library versions are installed

From: Bob Friesenhahn
Subject: Re: Trouble controlling linking if many library versions are installed
Date: Tue, 19 Mar 2002 08:53:33 -0600 (CST)

The foo-config type scripts are fraught with problems.  They attempt
to be a complete solution rather than expressing only the dependencies
they directly contribute.  Unfortunately, eliminating -L/usr/lib
-L/lib and -I/usr/include is not an appropriate solution because it
may be that library dependencies dictate that a library in this
directory is required prior to another library.  The only solution may
be explicit linkage.

Working CPPFLAGS and LDFLAGS options for complex packages are
generally hand-crafted based on detailed analysis and experience.


On Tue, 19 Mar 2002, Rob Browning wrote:

> Steve Tell <address@hidden> writes:
> > In additional experimention, I found that simply removing -L/usr/lib
> > altogether works in this case, perhaps because of the --rpath.
> > "Correct" for me here is building a that depends
> > explicitly on the versioned name (which I guess will
> > be searched for at runtime)
> We've had a similar ongoing problem with the foo-config type scripts,
> i.e. "foo-config --libs".  If any one of them that you're using to
> compile a given project produces -I/usr/include or -L/usr/lib, and if
> its flags appear on your compile/link line ahead of some other lib,
> then its impossible to build your project using a non /usr/lib install
> of some library that's also installed in /usr/lib.  For example, if
> you have guile 1.4 installed in /usr/lib, and you install the guile
> 1.5 beta into /opt/guile-1.5, you will be unable to compile or link a
> gtk app against guile 1.5 if any of the gtk config scripts output
> -L/usr/lib and those flags appear before -lguile on the link line.
> On Linux and similar systems, could libtool, foo-config scripts,
> etc. just special case (and omit) -L/usr/lib -L/lib and
> -I/usr/include?
> Thanks
> -- 
> Rob Browning
> rlb,, and
> Previously
> GPG=1C58 8B2C FB5E 3F64 EA5C  64AE 78FE E5FE F0CB A0AD
> _______________________________________________
> Libtool mailing list
> address@hidden

Bob Friesenhahn

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