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Joseph
Guest
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 Posted: Mon Feb 27, 2006 3:06 pm Post subject: variables & method naming conflicts |
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Hi Gurus,
I got a problem, I am trying to port a win32 prog to Linux. It was all
one big program.cpp and I have to split the functions into separate
init_pxi6052e.cpp,func1.cpp and func2.cpp in order to compile them
separately and debug them. In both cpp file I have to include a common
header file lets call it here as "datatype.h" which is included in both
"init_pxi6052e.cpp" and "test_init_boards.cpp". Both these object
compiles ok. SEe here
%g++ -c test_init_boards.cpp
%g++ -c init_pxi6052e.cpp
However it screws up where I try to link them together to an
executable.
%g++ -o test_init_boards test_init_boards.o init_pxi6052e.o
callback_everyn.o -lnidaqmx
init_pxi6052e.o(.bss+0x20): multiple definition of `InputDataBuffer'
test_init_boards.o(.bss+0x20): first defined here
init_pxi6052e.o(.bss+0x24): multiple definition of `OutputDataBuffer'
test_init_boards.o(.bss+0x24): first defined here
init_pxi6052e.o(.bss+0x40): multiple definition of `msg'
test_init_boards.o(.bss+0x40): first defined here
.... [many lines more here]
I am mixing some C header files in the "datatype.h" files. What is the
best ways to handle this? Please help! |
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Rolf Magnus
Guest
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| Posted: Mon Feb 27, 2006 3:06 pm Post subject: Re: variables & method naming conflicts |
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Joseph wrote:
| Quote: | Hi Gurus,
I got a problem, I am trying to port a win32 prog to Linux. It was all
one big program.cpp and I have to split the functions into separate
init_pxi6052e.cpp,func1.cpp and func2.cpp in order to compile them
separately and debug them. In both cpp file I have to include a common
header file lets call it here as "datatype.h" which is included in both
"init_pxi6052e.cpp" and "test_init_boards.cpp". Both these object
compiles ok. SEe here
%g++ -c test_init_boards.cpp
%g++ -c init_pxi6052e.cpp
However it screws up where I try to link them together to an
executable.
%g++ -o test_init_boards test_init_boards.o init_pxi6052e.o
callback_everyn.o -lnidaqmx
init_pxi6052e.o(.bss+0x20): multiple definition of `InputDataBuffer'
test_init_boards.o(.bss+0x20): first defined here
init_pxi6052e.o(.bss+0x24): multiple definition of `OutputDataBuffer'
test_init_boards.o(.bss+0x24): first defined here
init_pxi6052e.o(.bss+0x40): multiple definition of `msg'
test_init_boards.o(.bss+0x40): first defined here
... [many lines more here]
I am mixing some C header files in the "datatype.h" files. What is the
best ways to handle this? Please help!
|
What are InputDataBuffer, OutputDataBuffer and msg? Are they types? Global
variables? Where are they defined? In the cpp files or in the header? Where
is their declaration? |
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JE
Guest
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| Posted: Mon Feb 27, 2006 5:06 pm Post subject: Re: variables & method naming conflicts |
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Joseph wrote:
<snip>
| Quote: | I have to include a common
header file lets call it here as "datatype.h" which is included in both
"init_pxi6052e.cpp" and "test_init_boards.cpp".
snip
multiple definition of
snip whatever |
Maybe you've got globals that violate the "One Definition Rule" in
header(s)? Make sure you've got extern whatever in the header (_not_
initialized, because that would be a definition) for your declaration,
and _one_ definition in one of your .cpp files...
JE |
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