Error when linking against libtoxcore: undefined reference to symbol 'crypto_hash_sha256'

[anthonybilinski]

Follow up from qTox/qTox#4695

I'm trying to package to toxcore and qTox. When linking qTox, I get the following error:

[  224s] [ 85%] Linking CXX executable qtox
[  224s] /usr/bin/cmake -E cmake_link_script CMakeFiles/qtox.dir/link.txt --verbose=1
[  224s] /usr/bin/x86_64-linux-gnu-g++   -g -O2 -fdebug-prefix-map=/usr/src/packages/BUILD=. -fstack-protector-strong -Wformat -Werror=format-security  -std=c++11 -fno-exceptions -fno-rtti -fPIE -Wstrict-overflow -Wstrict-aliasing -fstack-protector-all -Wstack-protector -pthread -pthread   -Wl,-Bsymbolic-functions -Wl,-z,relro -pie -Wl,-z,now -Wl,-z,relro CMakeFiles/qtox.dir/qrc_res.cpp.o CMakeFiles/qtox.dir/qrc_translations.cpp.o CMakeFiles/qtox.dir/qrc_emojione.cpp.o CMakeFiles/qtox.dir/qrc_smileys.cpp.o CMakeFiles/qtox.dir/src/main.cpp.o CMakeFiles/qtox.dir/qtox_automoc.cpp.o  -o qtox -rdynamic libqtox_static.a /usr/lib/x86_64-linux-gnu/libQt5Network.so.5.6.1 /usr/lib/x86_64-linux-gnu/libQt5OpenGL.so.5.6.1 /usr/lib/x86_64-linux-gnu/libQt5Svg.so.5.6.1 /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.6.1 /usr/lib/x86_64-linux-gnu/libQt5Xml.so.5.6.1 -lavcodec -lavdevice -lavformat -lavutil -lexif -lqrencode -lsodium -lswscale -lsqlcipher -lvpx -lm -ltoxcore -ltoxdns -ltoxencryptsave -lm -lpthread -ltoxav -lopus -lvpx -lm -ltoxcore -ltoxdns -ltoxencryptsave -lm -lpthread -lopenal -lX11 -lXss -lgdk_pixbuf-2.0 -lgobject-2.0 -lglib-2.0 -lglib-2.0 -lgtk-x11-2.0 -lgdk-x11-2.0 -lpangocairo-1.0 -latk-1.0 -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lfontconfig -lfreetype /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.6.1 /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.6.1 -ltoxav -lopus -lopenal -lX11 -lXss -lgdk_pixbuf-2.0 -lgobject-2.0 -lglib-2.0 -lgtk-x11-2.0 -lgdk-x11-2.0 -lpangocairo-1.0 -latk-1.0 -lcairo -lgio-2.0 -lpangoft2-1.0 -lpango-1.0 -lgdk_pixbuf-2.0 -lgobject-2.0 -lglib-2.0 -lgtk-x11-2.0 -lgdk-x11-2.0 -lpangocairo-1.0 -latk-1.0 -lcairo -lgio-2.0 -lpangoft2-1.0 -lpango-1.0 -lfontconfig -lfreetype 
[  225s] /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/6/../../../../lib/libtoxcore.a(libtoxcore_la-crypto_core.o): undefined reference to symbol 'crypto_hash_sha256'
[  225s] //usr/lib/x86_64-linux-gnu/libsodium.so.18: error adding symbols: DSO missing from command line
[  225s] collect2: error: ld returned 1 exit status
[  225s] CMakeFiles/qtox.dir/build.make:3305: recipe for target 'qtox' failed

I can workaround this by adding the link libraries twice so that -lsodium comes after -ltoxcore, but it's a little hacky and would only fix the issue for qTox.

If I build toxcore with cmake instead of automake, it links correctly, and it was suggested on the qTox ticket that this might be a packaging issue with toxcore.

Since toxcore recommends building with automake, I'm wondering if there's a simple fix available.

[cringeops]

make install & ldconfig won’t do as far as I understand?

[SkyzohKey]

See also https://stackoverflow.com/questions/19901934/strange-linking-error-dso-missing-from-command-line

[iphydf]

@anthonybilinski does this still happen after #442?

[iphydf]

Static linking works now.