Something

gentoo-sources::
(11:32) < Astinus>   CC      mm/fremap.o
(11:32) < Astinus> mm/fremap.c: In function `install_page':
(11:32) < Astinus> include/asm/pgtable.h:237: error: invalid `asm': operand number missing after %-letter
(11:32) < Astinus> {standard input}: Assembler messages:
(11:32) < Astinus> {standard input}:229: Error: Illegal operands
(11:32) < Astinus> make[1]: *** [mm/fremap.o] Error 1
(11:32) < Astinus> make: *** [mm] Error 2

vanilla-sources::
  CC      scripts/mod/empty.o
  HOSTCC  scripts/mod/mk_elfconfig
cc1: error: invalid option `medlow'
cc1: error: unrecognized command line option "-fno-stack-protector-all"
cc1: error: unrecognized command line option "-fno-stack-protector"
make[2]: *** [scripts/mod/empty.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [scripts/mod] Error 2
make[1]: *** Waiting for unfinished jobs....
  HOSTLD  scripts/genksyms/genksyms
make: *** [scripts] Error 2