Discussion:
Compile Qt program on Ubuntu 18.04 which will run on Ubuntu 14.04
(too old to reply)
r***@logikalsolutions.com
2018-11-16 16:02:29 UTC
Permalink
bundle stdlib++ etc with your app
Thank you Vlad.

You are correct that, traditionally, going backwards, that is about
all you need, as long as there are no ABI changes to the C/C++
language which force one to bring ld-2.27.so and repoint the 32-bit
loader on 64-bit systems.

if [ ! -f /lib/ld-linux.so.2 ]
then
logger ipos postinst changing loader file
# We know the file the symbolic link should point to
doesn't exists
# but do we have a stale symbolic link?
#
if [ -h /lib/ld-linux.so.2 ]
then
logger ipos postinst unlinking /lib/ld-linux.so.2
unlink /lib/ld-linux.so.2
fi
# find returns files with ./ prefix so we use sed to remove it.
# loader_file=$(find /lib/i386-linux-gnu/ -type f -iname
ld-2.* -print |sed "s/\.\///g")
loader_file=$(find /lib/i386-linux-gnu -type f -iname
ld-2.* -print |sed "s/\.\///g")
if [ ! -z "$loader_file" ]
then
logger ipos postinst new loader file "$loader_file"
ln -s "$loader_file" /lib/ld-linux.so.2
fi
fi

The ABI changes to C/C++ were to severe this time. Even when forcing
C++11 compilation the differing systems would not recognize the
binaries as executables. Even ldd refused to work on them.

For the year end release, due to time, it was built on 14.04 and still
had to bring its own little universe of libraries routed through via
RPATH. Not really that many less than going backwards. Not in the
grand scheme of things anyway. Next year, when 14.04's repos get
turned off and nobody can spin up a 14.04 build environment with all
updates applied, someone will have to take the time to find their way
around this little ABI debacle, or, most hopefully, one of the Ubuntu
developers will fix ld-linux so it can recognize and work with
multiple ABIs. Right now that is really the scrambled egg, ld-linux is
far to picky. The rest of the libraries have multi-ABI support
compiled in, but, ld-linux isn't playing nice with those who are
different.
--
Roland Hughes, President
Logikal Solutions
(630) 205-1593

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