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Re: libtool, Apache 2.0, AIX
From: |
mcnichol |
Subject: |
Re: libtool, Apache 2.0, AIX |
Date: |
Fri, 30 Nov 2001 13:59:19 -0600 |
Jeff,
You can change the behavior of libtool on AIX by adding a
a flag to the LDFLAGS variable.
Try this:
export LDFLAGS="-Wl,-brtl"
before doing configure and make.
Dan
> From: Jeff Trawick <address@hidden>
>
> Apache 2.0 uses libtool and has for some time now.
>
> On AIX we're trying to use libtool 1.4.2 but are running into some
> issues that perhaps someone can shed some light on.
>
> background info:
>
> Apache 2.0 uses code in libapr and libaprutil, implicitly loaded
> with httpd.
>
> As always, Apache 2.0 does dlopen() on DSOs configured in
> httpd.conf. These DSOs reference symbols in the main executable
> (httpd), libapr, libaprutil, and anything else needed by the DSO.
>
> libtool+AIX behaviors which we don't understand:
>
> (Some of this we can work-around with AIX-specific logic in our own
> build. Some of this we might be able to patch into libtool. For all
> of this, it would be useful if the suggested behavior is inappropriate
> for some reason.)
>
> 1) after building our shared libraries, libtool is putting them in an
> archive file and that archive file is what gets installed... why
> is this? while this works on AIX, it is non-intuitive... people
> expect foo.so, particularly with Apache DSOs like mod_include...
>
> currently on AIX I need to use the Apache syntax
>
> LoadModule mod_foo libfoo.a(libfoo.so.0)
>
> and turn on the dlopen() flag that allows members to be loaded.
>
> While the libfoo isn't a major problem for libraries used
> implicitly by httpd (libapr and libaprutil), it is messy for DSOs
> because of the Apache configuration file syntax implications.
>
> So... really important for us to avoid the archive/member thing for
> Apache DSOs. nice for us to avoid the archive/member thing for
> libapr/libaprutil
>
> It seems to me that doing run-time linking will trick libtool into
> skipping the archive/member thing but we don't want run-time
> linking.
>
> 2) export file format
>
> libtool seems to be building a nice export file on AIX, but it is
> missing a small detail which would allow it to be used as an
> import file
>
> remember that on AIX, a shared library which needs symbols from
> another shared library must use import files to tell the loader
> which symbols are expected from which shared libraries...
>
> Apache builds libaprutil.a(libaprutil.so) which depends on
> libapr.a(libapr.so). It would be nice if the export file for
> libapr had "#! libapr.a(libapr.so)" at the top so it can be used as
> an import file
>
> 3) implicitly specifying import files
>
> (closely related to #2 above)
>
> libaprutil depends on libapr
>
> when I build libaprutil it would be nice for the libapr
> import/export file to be specified by libtool; it should be able to
> know that I'm building a shared library (libaprutil) which depends
> on another shared library (libapr)
>
> currently, libaprutil is not usable because the dynamic linker
> doesn't know how to resolve the symbols
>
> 4) it would be nice to get libtool-generated export files for main
> executables... libtool has the nice logic to generate the export
> files... I don't know how to get one generated for the main
> executable (e.g., .libs/httpd.exp to go with .libs/httpd)
>
> we do have logic to generate our own export files, but if we get
> libtool to implicitly use import files libtool would want to use a
> file it had generated
>
> Thanks and best wishes,
>
> Jeff
> --
> Jeff Trawick | address@hidden | PGP public key at web site:
> http://www.geocities.com/SiliconValley/Park/9289/
> Born in Roswell... married an alien...
>
> _______________________________________________
> Libtool mailing list
> address@hidden
> http://mail.gnu.org/mailman/listinfo/libtool
>
- libtool, Apache 2.0, AIX, Jeff Trawick, 2001/11/30
- Re: libtool, Apache 2.0, AIX, Marc Stephenson, 2001/11/30
- Re: libtool, Apache 2.0, AIX, Jeff Trawick, 2001/11/30
- Re: libtool, Apache 2.0, AIX, Robert Boehne, 2001/11/30
- Re: libtool, Apache 2.0, AIX, Jeff Trawick, 2001/11/30
- Re: libtool, Apache 2.0, AIX, Jeff Trawick, 2001/11/30
- Re: libtool, Apache 2.0, AIX,
mcnichol <=