Problem with dynamically loaded 'libe-loader.so'

[alx123]

I compiled the Lazarus environment incl. FPC on a headless Parallella board with the image 01/30/2015. I want to access the functions of the Epiphany SDK via the dynamically loaded libraries libehal.so and libe-loader.so. So I converted the headers and implement the sample program of the third chronicle.
All the used functions of libe-hal.so are successful. But calling a function of the libe-loader.so gives a crash of the program with the following message:
symbol lookup error: /opt/adapteva/esdk/tools/host/lib/libe-loader.so: undefined symbol: e_alloc.
Obviously the second library needs the first one, but cannot or do not load the functions.
How can I resolve this conflict?
I do not have static libraries in order to write a wrapper with all exported functions in one library.

Thanks in advance
Alex

[olajep]

You need to pass these options to the linker somehow:
-L/opt/adapteva/esdk/host/lib
-le-hal
-le-loader

I'm not familiar with lazarus in any way but maybe this helps, seems similar to what you want to do:
http://wiki.lazarus.freepascal.org/Macros_and_Conditionals#Examples

HTH,

Ola

[alx123]

Thanks for your advice, but I can't it running. I tried to copile a wrapper library with Geany, the light C environment:
Compile:
gcc -fPIC -c epiphany.c -o epiphany.o -I /opt/adapteva/esdk/tools/host/include
Build:
gcc -shared epiphany.o -o libepiphany.so -L /opt/adapteva/esdk/tools/host/lib -le-hal -le-loader

But it cannot be loaded, nevertheless nm -D .. shows the exported functions.

I also checked the cputimer example program. An executable works, but the compiled library cannot be loaded by LoadLibrary.

But on the other side, using of the dynamic library libe-hal.so works fine. Only the three not so unimportant functions from libe-loader.so cannot access to the other library.

What about recreate these only 3 functions in the pascal code. It cannot be so much code. But where are the source of the libe-loader library?

Thanks in advance
Alex

[olajep]

Are you cross-compiling?

You probably need to add the -le-hal and -le-loader when you link your library too. Also you need to set
-L/opt/adapteva/esdk/tools/host/lib.

[alx123]

Hello,
no, I'm not cross-compiling.
By the example I know, that the not found functions are because of the non set environment variable LD_LIBRARY_PATH.
So I try to recompile the libs by build-libs.sh. But where the environment variable PARALLELLA_LINUX_HOME should set to, in order to compile not only e-loader and e-xml.
All things on the Parallella-Board with E16 and the headless image with preconfigured sdk.

Thanks
Alex

[Urhixidur]

The e-loader.c source is found in epiphany-libs/src/e-loader/src/