how to get debugging symbols in automake c project

See more:

C

Cygwin

debugging

GNU

I want to debug a automake c project. and I am doing it with Cygwin in windows.
I can compile it correctly, by doing

aclocal
automake --add-missing
autoreconf
./configure
make

for use gdb debugger, I want to generate debug , so I did like

...
./configure CFALGS=-g3    (or ./configure CFLAGS="-g -o0")
make

after that, when I load execitable by using

gdb ./slim.exe

it says:

no debug symbols found

how can I get debug symbols in executable in order to use gdb debugger for c project?
I am new at those , so please answer a bit specific.
Thanks in advance