On Sun, 2002-05-26 08:46:52 +0800, bert <[EMAIL PROTECTED]> wrote in message <[EMAIL PROTECTED]>: > When I test the sample code given by manpage of libipq, I use the fallowing command >to compile. > "g++ sample.cpp -o sample -lipq" > but there are some link errors. > why?? > I have downloaded the ipchains and using "make ,make install ,make install-devel" to >build it. > How to deal with problems? > Thanks > > [root@ir kern]# g++ sample.cpp -lipq
First, never ever compile as user "root". Root privileges have never
been required to compile some C code...
Second, you're using a C++ compiler and C++ sources. This means that all
identifers (variables and functions and so on) are in C++ namespace
(which means that basically they get their type added to their name;
> /tmp/cczHtLb0.o: In function `die(ipq_handle *)':
> /tmp/cczHtLb0.o(.text+0xf): undefined reference to `ipq_perror(char const *)'
...this is why the linker says "undefined reference to
`ipq_perror(char const *)'"
^^^^^^^^^^^^^^
However, libipq functions are C functions which are within C namespace.
So you can't access them from C++ [1].
MfG, JBG
[1] You can, of course, put "#ifdev __cplusplus ... extern C { ... }"
around the libipq header files so that the C++ compiler knows that
these functions are written in C, not in C++...
--
Jan-Benedict Glaw . [EMAIL PROTECTED] . +49-172-7608481
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