I am porting GCC to a new 32bits cpu. Any idea what could be the reason that I am getting undefined references to: gt_ggc_mx_machine_function(void*) gt_pch_nx_machine_function(void*) Which macro or target-macro should I define to avoid such error ? -------------- gtype-desc.o: In function `gt_ggc_mx_function(void*)': /home/user/Documents/gcc-8.2.0-build/gcc/gtype-desc.c:1621: undefined reference to `gt_ggc_mx_machine_function(void*)' gtype-desc.o: In function `gt_pch_nx_function(void*)': /home/user/Documents/gcc-8.2.0-build/gcc/gtype-desc.c:5142: undefined reference to `gt_pch_nx_machine_function(void*)' collect2: error: ld returned 1 exit status ../../gcc-8.2.0/gcc/c/Make-lang.in:85: recipe for target 'cc1' failed make[2]: *** [cc1] Error 1 make[2]: Leaving directory '/home/user/Documents/gcc-8.2.0-build/gcc' Makefile:4246: recipe for target 'all-gcc' failed make[1]: *** [all-gcc] Error 2 make[1]: Leaving directory '/home/user/Documents/gcc-8.2.0-build' Makefile:883: recipe for target 'all' failed make: *** [all] Error 2 ----------