Comments (4)
Thalhammer
commented on July 21, 2024
1
@Niko9911 dl is used for loading shared libraries at runtime. Jwt-cpp does not directly do this, however OpenSSL might.
I would not consider this ugly, as it allows for a lot of opzimizations which would be hard or impossible without it. Also unless you did some extra steps you already use the dynamic linker anyway. If you really want it to be gone it might be possible to compile a version of OpenSSL without Support for dynamic libs but I dont know for sure and would strongly recommend against it unless you know exactly what you are doing. Linking against dl really does not harm (except for a few k of binary Size if At all).
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Thalhammer
commented on July 21, 2024
Make sure you link against libssl and libcrypto.
The errors tell you that they were not linked.
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NikoGrano
commented on July 21, 2024
Hi!
Thank you for your reply. I did manage to fix this. However, as I'm just playing with C++ and have not much expirence with it, would ask your opinion about this:
GameTactic/CPP-Echo@8651f86#diff-95e351a3805a1dafa85bf20b81d086e6R14
The "Fix" on line 14 is containing -ldl at end. This is pretty dirty, do you think there would be any better way to do it?
Otherwise it will crash while compiling into
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): in function `dlfcn_globallookup':
(.text+0x11): undefined reference to `dlopen'
/usr/bin/ld: (.text+0x24): undefined reference to `dlsym'
/usr/bin/ld: (.text+0x2f): undefined reference to `dlclose'
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): in function `dlfcn_bind_func':
(.text+0x1a8): undefined reference to `dlsym'
/usr/bin/ld: (.text+0x272): undefined reference to `dlerror'
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): in function `dlfcn_load':
(.text+0x2e1): undefined reference to `dlopen'
/usr/bin/ld: (.text+0x359): undefined reference to `dlclose'
/usr/bin/ld: (.text+0x395): undefined reference to `dlerror'
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): in function `dlfcn_pathbyaddr':
(.text+0x451): undefined reference to `dladdr'
/usr/bin/ld: (.text+0x4b6): undefined reference to `dlerror'
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libcrypto.a(dso_dlfcn.o): in function `dlfcn_unload':
(.text+0x682): undefined reference to `dlclose'
collect2: error: ld returned 1 exit status
make[2]: *** [src/CMakeFiles/server.dir/build.make:85: src/server] Error 1
make[1]: *** [CMakeFiles/Makefile2:1032: src/CMakeFiles/server.dir/all] Error 2
make: *** [Makefile:130: all] Error 2
Thank you for your advice 🏅 !
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NikoGrano
commented on July 21, 2024
Thank you for your opinion. Makes sense.
Closing issue as resolved question. 👍
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