On 10/18/2010 04:54 PM, Sergio Belkin wrote:
Hi,
Let's say we have the check:
AC_SEARCH_LIBS([ns_get16],[resolv])
How can I do to detect library directory path based on host
architecture, I mean, I want that if is an x86_64 bit looks on
${prefix}/lib64 and if is 32-bit look on /usr/lib. I'd want to avoid
that user has to provide manually LDFLAGS. Is that possible? If I am
thinking something wrong, correct me.
Why should you want to offload the responsibility for the user setting
up their system correctly in the first place? And you can't blindly
assume that ${prefix}/lib64 is the correct spelling, as there are 64-bit
OSs that install their libraries directly in /usr/lib. And, per the GNU
Coding Standards, a user should feel free to install libraries in ~/lib
(if they don't have write access to /usr) rather than /usr/local/lib
(autoconf's default, good for installing optional packages above what
the distro includes); as it is, libraries installed in /usr/lib64 is
already a case of distros using the GCS-mandated ability to specify an
alternate $prefix of /usr instead of the default /usr/local.
In my opinion, the solution to the 32- vs. 64-bit library question
SHOULD be answered by the user (and not by the configure author).
Obviously, this can be done by setting LDFLAGS for every configure run
of every package, but that gets tiresome. But more efficiently, this
can be done by installing an appropriate config.site to answer the
question up front. And the manual already mentions how to do that:
http://www.gnu.org/software/autoconf/manual/autoconf.html#Site-Defaults
If a distro wants to ship 64-bit libraries in /usr/lib64, then they
should also ship a config.site that automatically uses that directory
any time a configure script targets ${prefix} of /usr, so that users
automatically get this default without having to set LDFLAGS themselves.
But that's in the realm of the distro, not of autoconf.
As a package author, you shouldn't have to care about the distro's
choice of spelling for preferred library location.
--
Eric Blake eblake@xxxxxxxxxx +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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