Re: [Starpu-devel] StarPU

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

Hello,

Thilo Kogge, le Wed 25 Jun 2014 18:43:29 +0200, a écrit :
> I was not able to install the gcc extension on my machine

This is not a problem here, the example program you took doesn't use any
language extension.

>     gcc `pkg-config --cflags libstarpu`  `pkg-config --libs libstarpu`
> hello_world.c -o hello_world

[...]

> hello_world.c:(.text+0x31): undefined reference to `starpu_init'

[...]

> user@machine:~/starpu/test$ pkg-config --libs libstarpu
> -L/home/user/starpu-install/lib -L/usr/local/cuda/lib64 -L/home/user/
> hwloc-install/lib -lstarpu-1.1 -lcudart -lcublas -lcuda -lstdc++ -lOpenCL
> -lhwloc

Well, I don't see how it could ever happen that starpu_init is missing
while -lstarpu-1.1 is passed, as libstarpu always contains the
starpu_init function.  Could you make sure that nothing odd is happening
by calling both

gcc `pkg-config --cflags libstarpu`  `pkg-config --libs libstarpu` 
hello_world.c -o hello_world
echo `pkg-config --cflags libstarpu`  `pkg-config --libs libstarpu` 
hello_world.c -o hello_world

in the same shell, and check that the echo output contains -lstarpu-1.1

Also, perhaps for some reason your linking toolchain prefers -l flags to
be appended after C files using their symbols, i.e. rather this:

gcc hello_world.c -o hello_world `pkg-config --cflags libstarpu`  `pkg-config 
--libs libstarpu` 
echo `pkg-config --cflags libstarpu`  `pkg-config --libs libstarpu` 
hello_world.c -o hello_world

> It looks like if the examples are made for plugin-support.

No, only examples inside the gcc-plugin directory are made for plugin
support.

Samuel