I am attempting to add an existing library to Eclipse. I use a [cross compiler](http://hertaville.com/2012/09/28/development-environment-raspberry-pi-cross-compiler/) for C++ with the Eclipse IDE, installed on a virtual linux debian machine.

The `mmapGpio` lib is found [here](http://hertaville.com/OTHERFILES).

`/mmapGpioBasicRev1.tar.gz` has a `cpp` and an `h` file with a small demo program.

I have compiled this code without a problem. A `.o` file is generated. I've archived the file successfully with `ar -q libmmapGpio.a mmapgpio.o`

I've placed my `libmmapGpio.a` in `~/.../UserLib directory`
I've placed my `mmapGpio.h` in `~/.../UserInclude`

At this point all is OK.

I open a new project that uses the `mmapGpio` library: 

```
#include "mmapGpio.h"
#include "stdio.h"

int main(void){
    mmapGpio rpiGpio; // instantiate an instance of the mmapGpio class
    rpiGpio.setPinDir(17,mmapGpio::OUTPUT); // set GPIO17 to output
    while(1) {// toggle pin as fast as possible
           rpiGpio.writePinHigh(17);
           rpiGpio.writePinLow(17); 
    }

    return 0;
}

```

So cross-compilation is done, but linker say `cannot find -llibmapGpio`!

I have made declaration in the properties project; C/C++ General 

* includes path : `/home/octopuss/rpi/UserInclude` (the mmapGpio.h file)
* Library path : `/home/octopuss/rpi/UserLib` (the libmmapGpio.a file)
* Libraries : `libmmapGpio`

Why do I receive this message? 

for detail -> console view 

```
03:16:30 **** Build of configuration Debug for project Gpio1 ****
make all 
Building file: ../Gpio1.cpp
Invoking: Cross G++ Compiler
arm-linux-gnueabihf-g++ -I/home/octopuss/rpi/UserInclude -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"Gpio1.d" -MT"Gpio1.d" -o "Gpio1.o" "../Gpio1.cpp"
Finished building: ../Gpio1.cpp

Building target: Gpio1
Invoking: Cross G++ Linker
arm-linux-gnueabihf-g++ -L/home/octopuss/rpi/UserLib -o "Gpio1"  ./Gpio1.o   -lmmapGpio
/home/octopuss/rpi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/../lib/gcc/arm-linux-gnueabihf/4.8.3/../../../../arm-linux-gnueabihf/bin/ld: skipping incompatible /home/octopuss/rpi/UserLib/libmmapGpio.so when searching for -lmmapGpio
/home/octopuss/rpi/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/../lib/gcc/arm-linux-gnueabihf/4.8.3/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lmmapGpio
collect2: error: ld returned 1 exit status
make: *** [Gpio1] Erreur 1

```

error :

* skipping incompatible /home/.../UserLib/libmmapGpio.so when searching for -lmmapGpio
* ld: cannot find -lmmapGpio