MinGW GNAT and GCC specs strings

["Hibou57 (Yannick Duchêne)" <yannick_duchene@yahoo.fr>]

Hello all of you,

I've builded a custom MinGW environnemen. I've tried it on a C file :
Ok. Then I've tried it on an Ada file : Failed. gnat1 failed to find
system.ads. So I attempted to pass an "-Imydir" option to gnat1 adding
a "*gnat1: -Imydir." specs string in the GCC specs file, but it does
not seems to work. As a check, if I invok "gcc -v -c test.adb", then I
can see that the arguments I want to pass to gnat1 via the GCC specs
file is not given to the gnat1 command line. So I suppose GCC does not
know the gnat1 specs string (although is perfectly knows the cc1 specs
string).

Is it possible to pass the "-Imydir" command line option to gnat1
using the GCC specs file ?

Or is there another way, without using environnement variables, to
tell gnat1 where Ada includes and libs are located ?

Have a nice day