linker problem with libstdc++.so.6 in connection with cuda
today i encountered a problem with linking my compiled cuda stuff.
i have a uptodate debian testing w/ 2.6.32-3-amd64.
i worked all day on my code. compiling from time to time. had no problem. but then after a minor code change i got following error:
gcc -o pa CUDA.o histogram256.o histogram64.o main.o -lrt -lm -lcudart -I. -I/data/cuda/include -I/data/cuda/C/common/inc -L/data/cuda/lib64
/usr/bin/ld: main.o: undefined reference to symbol 'std::basic_ifstream<char, std::char_traits<char> >::close()@@GLIBCXX_3.4'
/usr/bin/ld: note: 'std::basic_ifstream<char, std::char_traits<char> >::close()@@GLIBCXX_3.4' is defined in DSO /usr/lib64/libstdc++.so.6 so try adding it to the linker command line
/usr/lib64/libstdc++.so.6: could not read symbols: Invalid operation
collect2: ld returned 1 exit status
i changed the code back but the error stayed.
the lib is where it should be. (/usr/lib64 is linked to /usr/lib)
ldd /usr/lib/libstdc++.so.6
linux-vdso.so.1 => (0x00007fff31fff000)
libm.so.6 => /lib/libm.so.6 (0x00007f15f625a000)
libc.so.6 => /lib/libc.so.6 (0x00007f15f5ef9000)
/lib64/ld-linux-x86-64.so.2 (0x00007f15f680d000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f15f5ce2000)
hopefully someone has a good advice.
adding
-L/usr/lib64 -lstdc++
to my makefile/commandlineparameters fixed it.
You could also use g++ instead of gcc. This will automatically link against stdc++ without you having to specify it explicitly.
What is the difference between g++ and gcc?
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