On Tue, Aug 24, 2021 at 2:52 PM Richard W.M. Jones <[email protected]> wrote: > > There's a problem here ... > > For background see: > https://lists.fedoraproject.org/archives/list/[email protected]/thread/7R3H3RWXC2FEJ6MRTFFUZY5KRYKPL2TQ/ > (You have to click the "..." in that email) > > If libc_malloc_debug.so.0 isn't installed then LD_PRELOAD generates > lots of warning messages and this actually breaks some tests. > > If ./configure is used without --libdir then we try to set > LD_PRELOAD=/usr/local/lib/libc_malloc_debug.so.0 which causes the > warnings/failures. > > My first idea was to test in ./configure if $libdir/libc_malloc_debug.so.0 > exists and only set LD_PRELOAD if so. However that doesn't work > because of $!"£% exec_prefix (a.k.a. the most useless GNU feature that > no one uses but causes all the trouble). > > Also if you have glibc.i686 and glibc.x86_64 installed then both > /lib64/libc_malloc_debug.so.0 and /lib/libc_malloc_debug.so.0 exist > and you must choose the correct one. On other distros the path will > be different, eg. the 64 bit one in /lib/libc_malloc_debug.so.0 or > /lib/x86_64-linux-gnu/... etc.
ld.so has a new --list-diagnostics option (since 2.34 AFAICT, backported to at least 2.33) that lists the system directories; maybe that could help? $ /lib64/ld-linux-x86-64.so.2 --list-diagnostics | grep system_dirs path.system_dirs[0x0]="/lib64/" path.system_dirs[0x1]="/usr/lib64/" libc_malloc_debug.so.0 will always be in one of these directories unless a distribution has misconfigured their glibc and not added their multilib paths into system_dirs. > So I don't know how to solve any of this. It would be nicer if glibc > handled the details and automatically loaded the right library if > GLIBC_TUNABLES was set. It is not impossible to implement; tunable parsing happens early enough that if any tunable requires a preloaded module then we can make it happen as long as the module is in path.system_dirs. We could fail silently too; it's certainly better than ignoring silently. Do you see any gotchas here Florian? Siddhesh _______________________________________________ Libguestfs mailing list [email protected] https://listman.redhat.com/mailman/listinfo/libguestfs
