Hello, I have ported the GCC-4.5.3 for a 32-bit CPU. Building GCC works like charm, even assembling several tests I wrote myself works. After porting the Gnu-Binutils I took my first approach of building libgcc. Poorly it runs into an error. ../../../gcc-4.5.3/libgcc/../gcc/libgcc2.c: In function '__powidf2': ../../../gcc-4.5.3/libgcc/../gcc/libgcc2.c:1739:1: internal compiler error: in use_type, at var-tracking.c:4903 On var-tracking.c line 4903: gcc_assert (REGNO (loc) < FIRST_PSEUDO_REGISTER); loc is an RTX. Can someone please give me pointer where the problem might be. If additional information is I will provide them. With best Regards Jens