Re: [Cppcms-users] linking libraries (Re: Starting with DbiXX

[Daniel V. <chi...@gm...>]

You are welcome.

I recommend

http://www.network-theory.co.uk/docs/gccintro/index.html

Specially the sections:

2.7 Linking with external libraries
11 How the compiler works.

Also note that -L flag is for directories that contains statics
libraries (.a) or dynamic libraries (.so "shared object"). Not for
headers files (-L/usr/local/include/dbixx/dbixx.h).

Also note, LD_LIBRARY_PATH is for runtime linking, not for compile time
linking.

When you fully understand how the preprocessor, the compiler and linker
works, the next step is learning to use a build system such as cmake.
This save a lot of time. And finally, the next step is use a IDE. I
strongly recommend kdevelop 4.

Regards.


On Thu, 2010-07-15 at 05:23 +0800, augustin wrote:
> On Thursday 15 July 2010 12:35:24 am Daniel Vallejos wrote:
> > The problem is that you are not linking the dbixx library.
> > 
> > The command is (for gcc)
> > 
> > c++ ../sql_test.cpp -o SQL -L/path/to/dbixx_library -ldbixx
> > 
> > You should read more about linking libraries.
> > 
> 
> Thanks a lot Daniel.
> 
> It now works using the mysql backend:
> 
>     overshoot@Augustin:~/git/cppcms/build$ c++ ../sql_test.cpp -o SQL -L     
>       /usr/local/include/dbixx/dbixx.h  -ldbixx
>     overshoot@Augustin:~/git/cppcms/build$ ./SQL
>       Moshe
>       There are 2 users
>       1       Moshe
>       2       Yossi
> 
> I appreciate a lot the pointer about linked libraries. As I said earlier, I am 
> new with C++ and there are some concepts I do not fully grasp yet (the 
> compiling aspect is barely covered at all in all the tutorials and manuals I 
> have read so far. All focus on the C++ language itself).
> 
> I have been perusing such sites as:
> http://en.wikibooks.org/wiki/C++_Programming
> http://www.cplusplus.com/
> and others.
> (You're welcome to share your favourite C++ reference web site).
> 
> And now that I know what to look for, I am about to study this: 
> http://linuxmafia.com/faq/Admin/ld-lib-path.html (They say: don't use 
> LD_LIBRARY_PATH)
> http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html
> http://www.cplusplus.com/query/search.cgi?q=linking+libraries
> 
> :)
> 
> Thanks again,
> 
> Augustin.
> 
> 
>