[asterisk-bugs] [JIRA] (ASTERISK-26909) Libdir defaults to /usr/lib64 on systems that have a stray lib64 directory

[Rusty Newton (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-26909?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rusty Newton updated ASTERISK-26909:
------------------------------------

    Status: Open  (was: Triage)

> Libdir defaults to /usr/lib64 on systems that have a stray lib64 directory
> --------------------------------------------------------------------------
>
>                 Key: ASTERISK-26909
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26909
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Core/BuildSystem
>    Affects Versions: 13.15.0
>            Reporter: Walter Doekes
>
> For ASTERISK-26705, commit bee55aaf2cc2936100b16f5a4acb87a3ea1235cd (branch 13) added this:
> {noformat}
>      * Fedora has a /usr/share/config.site that automatically tells
>        autoconf to use /usr/lib64 but CentOS does not. This logic was
>        copied to configure.ac and modified so systems like Ubuntu,
>        which still use /usr/lib for 64-bit systems, aren't affected.
> {noformat}
> {noformat}
> #
> # The following code for detecting lib64 was taken from Fedora's
> # /usr/share/config.site with a modification to check that the
> # /usr/lib64 directory actually exists.  This prevents libdir from
> # being set to /usr/lib64 on 64-bit systems that still use /usr/lib.
> #
> if test "$prefix" = /usr ||\
>      { test "$prefix" = NONE && test "$ac_default_prefix" = /usr ; }
> then
>      for i in x86_64 ppc64 s390x aarch64; do
>         if test $host_cpu = $i; then
>            if test "$libdir" = '${exec_prefix}/lib' &&\
>               { test -d "${exec_prefix}/lib64" || test -d "${ac_default_prefix}/lib64" ; } ; then
>               libdir='${exec_prefix}/lib64'
>               AC_MSG_NOTICE([ Setting libdir=${libdir} ])
>            fi
>            break
>         fi
>      done
> fi
> {noformat}
> The comment is not entirely correct. Debian and Ubuntu are not systems that "still use /usr/lib", they're systems using a different schema ("multiarch" and /usr/lib/x86_64-linux-gnu, but not /usr/lib64).
> However, if some installer at one point has created a /usr/lib64 directory on this system (I blame opensips), the asterisk libraries will also get placed into that wrong directory. The matters get worse if you create a debian package on a build OS that accidentally has a lib64 dir: now the binary archive package introduces libraries in /usr/lib64 onto other machines, propagating the existence of the lib64 directory that's not supposed to exist.
> I propose to change the check from merely checking the existence, to checking for libc.so.*.
> For example:
> {noformat}
> # head -n4 /etc/os-release 
> NAME="CentOS Linux"
> VERSION="7 (Core)"
> ID="centos"
> ID_LIKE="rhel fedora"
> # if [ -e /usr/lib64/libc.so ] || [ -e /usr/lib64/libc.so.? ]; then echo we want lib64; fi
> we want lib64
> {noformat}
> The above will be a bit more conservative in returning true but still return true for all systems which intentionally use /usr/lib64 (everyone has libc, right?).
> We could change the comment to:
> {noformat}
> # The following code for detecting lib64 was taken from Fedora's
> # /usr/share/config.site with a modification to check that the
> # /usr/lib64/libc.so shared library actually exists.  This prevents
> # libdir from being set to /usr/lib64 on 64-bit systems that do not
> # use /usr/lib64.
> {noformat}



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