libtelldus.so exports no symbols

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bbb
Posts: 3
Joined: Fri Mar 17, 2023 9:45 am

libtelldus.so exports no symbols

Post by bbb »

I get the following errors when linking:

Code: Select all

>>> g++ -o priv/telldus -ltelldus-core src/telldus.o
src/telldus.o: In function `main':
telldus.cpp:(.text+0x5e): undefined reference to `tdTurnOff'
telldus.cpp:(.text+0x70): undefined reference to `tdDim'
collect2: ld returned 1 exit status
Inspecting further with nm:

Code: Select all

>>> nm -g /usr/lib/libtelldus-core.so
nm: /usr/lib/libtelldus-core.so: no symbols
This can't be right, can it? :)
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bbb
Posts: 3
Joined: Fri Mar 17, 2023 9:45 am

Re: libtelldus.so exports no symbols

Post by bbb »

Ok, my Linux-fu failed me a bit. It seems symbols are indeed exported. However, I still get the linker error.

Output from

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readelf -Ws /usr/lib/libtelldus-core.so
:

Code: Select all

Symbol table '.dynsym' contains 158 entries:
   Num:    Value          Size Type    Bind   Vis      Ndx Name
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   114: 00000000000094d0   210 FUNC    GLOBAL DEFAULT   12 tdStop
   115: 0000000000008900    53 FUNC    GLOBAL DEFAULT   12 tdRegisterDeviceChangeEvent
   116: 000000000000a5c0   258 FUNC    GLOBAL DEFAULT   12 tdSetDeviceParameter
   117: 0000000000008c80   325 FUNC    GLOBAL DEFAULT   12 tdConnectTellStickController
   118: 000000000000ecc8     0 FUNC    GLOBAL DEFAULT   13 _fini
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   121: 0000000000009de0   447 FUNC    GLOBAL DEFAULT   12 tdGetModel
   122: 0000000000009230   197 FUNC    GLOBAL DEFAULT   12 tdGetNumberOfDevices
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   126: 000000000000dcd0   223 FUNC    WEAK   DEFAULT   12 _ZNSs12_S_constructIPcEES0_T_S1_RKSaIcESt20forward_iterator_tag
   127: 00000000000088c0    53 FUNC    GLOBAL DEFAULT   12 tdRegisterSensorEvent
   128: 0000000000008dd0   232 FUNC    GLOBAL DEFAULT   12 tdSendRawCommand
   129: 0000000000009150   210 FUNC    GLOBAL DEFAULT   12 tdGetDeviceId
   130: 00000000000093f0   210 FUNC    GLOBAL DEFAULT   12 tdLearn
   131: 000000000000a7c0   232 FUNC    GLOBAL DEFAULT   12 tdSetName
   132: 0000000000008880     5 FUNC    GLOBAL DEFAULT   12 tdReleaseString
   133: 000000000000a160   447 FUNC    GLOBAL DEFAULT   12 tdGetName
   134: 0000000000009be0   499 FUNC    GLOBAL DEFAULT   12 tdGetDeviceParameter
   135: 0000000000009070   210 FUNC    GLOBAL DEFAULT   12 tdGetDeviceType
   136: 000000000000a8b0   232 FUNC    GLOBAL DEFAULT   12 tdSetProtocol
   137: 000000000000a9a0   733 FUNC    GLOBAL DEFAULT   12 tdSensorValue
   138: 0000000000009850   233 FUNC    GLOBAL DEFAULT   12 tdDim
   139: 00000000000087f0     5 FUNC    GLOBAL DEFAULT   12 tdInit
   140: 0000000000008940    53 FUNC    GLOBAL DEFAULT   12 tdRegisterRawDeviceEvent
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   143: 0000000000008890     5 FUNC    GLOBAL DEFAULT   12 tdClose
   144: 0000000000213b18     0 NOTYPE  GLOBAL DEFAULT  ABS _end
   145: 0000000000008ec0   232 FUNC    GLOBAL DEFAULT   12 tdMethods
   146: 0000000000009fa0   447 FUNC    GLOBAL DEFAULT   12 tdGetProtocol
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   148: 0000000000008800   117 FUNC    GLOBAL DEFAULT   12 tdSensor
   149: 0000000000213b00     0 NOTYPE  GLOBAL DEFAULT  ABS _edata
   150: 0000000000009a20   210 FUNC    GLOBAL DEFAULT   12 tdTurnOff
   151: 00000000000089c0   357 FUNC    GLOBAL DEFAULT   12 tdGetErrorString
   152: 0000000000008980    53 FUNC    GLOBAL DEFAULT   12 tdRegisterDeviceEvent
   153: 000000000000a6d0   232 FUNC    GLOBAL DEFAULT   12 tdSetModel
   154: 0000000000009300   232 FUNC    GLOBAL DEFAULT   12 tdLastSentCommand
   155: 0000000000009690   210 FUNC    GLOBAL DEFAULT   12 tdUp
   156: 00000000000095b0   210 FUNC    GLOBAL DEFAULT   12 tdDown
   157: 0000000000003d40     0 FUNC    GLOBAL DEFAULT   10 _init
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bbb
Posts: 3
Joined: Fri Mar 17, 2023 9:45 am

Re: libtelldus.so exports no symbols

Post by bbb »

Whoa. Unexpected difference between GCC in Ubuntu 11.10 vs Ubuntu 11.04.

Formerly, this worked:

Code: Select all

g++ -o priv/telldus -ltelldus-core src/telldus.o
Now, I need to put -ltelldus-core at the end:

Code: Select all

g++ -o priv/telldus src/telldus.o -ltelldus-core
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micke.prag
Site Admin
Posts: 2243
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Location: Lund
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Re: libtelldus.so exports no symbols

Post by micke.prag »

Interesting. I have never seen that "requirement" in gcc before. Good to know!
Micke Prag
Software
Telldus Technologies
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davka003
Posts: 187
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Location: Sweden
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Re: libtelldus.so exports no symbols

Post by davka003 »

Order of the linking command arguments can be a nightmare. On my last company we compiled same code base to a handful of target architectures and randomly we needed to reorder the list of libraries. It was even the case that the order needed to be different for some architectures. All compiled with gcc.
My home automation software: Automagically @ Raspberry Pi http://automagically.weebly.com
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