Persistent gcc linker error

[petrux]

Hi there,

I installed POCO on my Debian Etch, build the package with no problem using "make" but I could not compile the DateTimeSample.cpp example. Using the bach command:

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>> g++ DateTimeSample.cpp -o DateTimeSample -I /usr/local/poco/Foundation/include -l /usr/local/poco/lib/Linux/i686/libPocoFoundation.so


I have a linker error:

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>> cannot find -l /usr/local/poco/lib/Linux/i686/libPocoFoundation.so


It happened also on Windows (using cygwin). It's quite strange!
Does anybody have any siggestion?

thanks in advance,
petrux

[alex]

> I have a linker error:
>

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> >> cannot find -l /usr/local/poco/lib/Linux/i686/libPocoFoundation.so
>

> It happened also on Windows (using cygwin). It's quite strange!
> Does anybody have any siggestion?

I have three (first being a fish, second and third fishing lessons):

1) try

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g++ DateTimeSample.cpp -o DateTimeSample -I/usr/local/poco/Foundation/include -L/usr/local/poco/lib/Linux/i686 -lPocoFoundation


2) when in doubt, use 'man g++' and 'man make'

3) use POCO build system to simplify your life. There is excellent documentation available.

Alex

[petrux]

Hi alex,

thanks four your reply (as usual (:wink:) )


> I have three (first being a fish, second and third fishing lessons):

Ehrm... as you have noticed my english is not so good, so I'm asking... what about "fish"?

> 1) try
>

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> g++ DateTimeSample.cpp -o DateTimeSample -I/usr/local/poco/Foundation/include -L/usr/local/poco/lib/Linux/i686 -lPocoFoundation
>

Did it, and got a run-time error:

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./DateTimeSample: error while loading shared libraries: libPocoFoundation.so.4: cannot open shared object file: No such file or directory


> 3) use POCO build system to simplify your life. There is excellent documentation available.

Ok, I'm taking a look.

Thanks and have a nice day,
petrux

[alex]

> > I have three (first being a fish, second and third fishing lessons):
>
> Ehrm... as you have noticed my english is not so good, so I'm asking... what about "fish"?

There is an old Chinese proverb that says if you give man a fish you have fed him for a day but if you teach him how to fish, you have fed him for life.
So, although I gave you a fish already, I would also like you to learn how to fish.

BTW, do not worry about your English, you're doing fine. It is gmake you need to work on (:wink:)

> Ok, I'm taking a look.

Good. Keep on fishing (:wink:)

Alex

[petrux]

> There is an old Chinese proverb
[cut]

Oh my God... it's true! And there is a similar proverd in Italian too...

> BTW, do not worry about your English, you're doing fine. It is gmake you need to
> work on (:wink:)

LOL! It's true! I should google around to find some for-dummies documentation in order to learn to do my make file. BTW: also following the POCO build documentation the linker goes crasy... I think it's a more general (and serious) problem...

> Good. Keep on fishing (:wink:)

Let's hope to have something to eat tonight!
;-)

Thanks,
petrux

[alex]

> LOL! It's true! I should google around to find some for-dummies documentation in order to learn to do my make file. BTW: also following the POCO build documentation the linker goes crasy... I think it's a more general (and serious) problem...

Hm. Few clues:

1) Did you set $POCO_BASE?

2) Is your project under $POCO_BASE?

3) If not 2) then did you set [$http://www.appinf.com/poco/wiki/tiki-index.php?page=BuildSystem#PROJECT_BASE|$PROJECT_BASE]

Alex

[petrux]

Hi alex,

> Hm. Few clues:
[cut]

I've solved my problems on the Linux platform changing the LD_LIBRARY_PATH environment variable (or the /etc/ld.so.conf file, then running /sbin/ldconfig). Everything now seems to work properly!

Next steps (fishing lessons!) will be:
1 - compile everything on WinXP (__without__ using VisualStudio)
2 - build both under Linux and Win the POCO library and using __static__ libraries;

Meanwhile: thanks a lot!
petrux