Linphone 5.2.6+dfsg-1 crashes during startup:

$ linphone
linphone: error while loading shared libraries: libapp-plugin.so: cannot
open shared object file: No such file or directory

The file exists in the same location as for previous versions, on my
amd64 system at
/usr/lib/x86_64-linux-gnu/linphone-desktop/libapp-plugin.so. Setting
LD_LIBRARY_PATH to include the directory passes that, but then segfaults:

$ LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu/linphone-desktop linphone
QObject::connect: No such signal
App::applicationStateChanged(Qt::ApplicationState) in
./linphone-app/src/app/App.cpp:271
Set TimeZone to  "Europe/Berlin"
Speicherzugriffsfehler

Backtrace when running the same command in GDB:

Reading symbols from linphone...
Reading symbols from
/usr/lib/debug/.build-id/c0/10f0a4cfdba7d00b7fe025b8ca8561b99d60d1.debug...
(gdb) run
Starting program: /usr/bin/linphone
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
QObject::connect: No such signal
App::applicationStateChanged(Qt::ApplicationState) in
./linphone-app/src/app/App.cpp:271
Set TimeZone to  "Europe/Berlin"

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff5639974 in registerFont (fnt=0x7fffffffdb50)
     at text/qfontdatabase.cpp:1051
warning: 1051	text/qfontdatabase.cpp: Datei oder Verzeichnis nicht gefunden
(gdb) bt
#0  0x00007ffff5639974 in registerFont (fnt=0x7fffffffdb50)
     at text/qfontdatabase.cpp:1051
#1  QFontDatabasePrivate::addAppFont
     (this=this@entry=0x7ffff5b0e5c0 <(anonymous
namespace)::Q_QGS_privateDb::innerFunction()::holder>, fontData=...,
fileName=...)
     at text/qfontdatabase.cpp:2482
#2  0x00007ffff563d113 in QFontDatabase::addApplicationFont (fileName=...)
     at text/qfontdatabase.cpp:2534
#3  0x0000555555682bb3 in AppController::AppController
     (this=this@entry=0x7fffffffddc8, argc=@0x7fffffffddbc: 1,
     argc@entry=@0x7fffffffddbc: <optimized out>, argv=0x7fffffffdf58)
     at ./linphone-app/src/app/AppController.cpp:99
#4  0x00005555556003d9 in main (argc=<optimized out>, argv=<optimized out>)
     at ./linphone-app/src/app/main.cpp:78

i can confirm the problem. Same behavior with current state of the software. The qml and qt libraries are mainly unchanged since the original bug report.

It seems that it searches the wrong locations:

m@ryz:~$ LANG=C strace linphone 2>&1 |grep libapp
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/glibc-hwcaps/x86-64-v3/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/glibc-hwcaps/x86-64-v2/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/glibc-hwcaps/x86-64-v3/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/glibc-hwcaps/x86-64-v2/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/glibc-hwcaps/x86-64-v3/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/glibc-hwcaps/x86-64-v2/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/glibc-hwcaps/x86-64-v3/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/glibc-hwcaps/x86-64-v2/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/libapp-plugin.so", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
writev(2, [{iov_base="linphone", iov_len=8}, {iov_base=": ", iov_len=2}, {iov_base="error while loading shared libra"..., iov_len=36}, {iov_base=": ", iov_len=2}, {iov_base="libapp-plugin.so", iov_len=16}, {iov_base=": ", iov_len=2}, {iov_base="cannot open shared object file", iov_len=30}, {iov_base=": ", iov_len=2}, {iov_base="No such file or directory", iov_len=25}, {iov_base="\n", iov_len=1}], 10linphone: error while loading shared libraries: libapp-plugin.so: cannot open shared object file: No such file or directory
m@ryz:~$

This most likely needs to be fixed at compilation time.