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The error suggests some issue with the C library.For building the GCC compiler, you need prebuilt binutils + prebuilt C library.In case of cross compiler, one possible route is:. Ensure that you have prebuilt binutils (cross compile build). Gentoo install unknown host list.

Cross compile GCC:Add Configure option -without-headers. Now compile (see make targets in the link below).

Compile your C library and point to it when compiling your program for the targetSee some instructions for cross-compiling gcc here. Then 'install' the appropriate C library (glibc / newlib).Also, (if you are not already doing it) it may be worthwhile to ensure that the -prefix for bintutils and the gcc cross compile build are the same location.