When I have CONFIG_DEFAULT_ENVIRONMENT=y and try to build barebox, I see
HOSTCC scripts/mod/sumversion.o
then later I see it trying to build with CC and fails. 

I don't think that its supposed to try to build sumversion.o with the cross compiler toolchain.

Jon

make -f Makefile ARCH=arm CROSS_COMPILE=/opt/crosstool-ng-1.9.0/arm-1136j-eabi/gcc-4.4.5-newlib-1.18.0-binutils-2.20.1/bin/arm-1136j-eabi- 
make[1]: Entering directory `/home/ringlej/git/barebox'
make[2]: `include/generated/mach-types.h' is up to date.
  CHK     include/generated/version.h
  CHK     include/generated/utsrelease.h
  SYMLINK include/config.h -> arch/arm/boards/isc3//config.h
  HOSTCC  scripts/mod/sumversion.o
  HOSTLD  scripts/mod/modpost
  CC      lib/ctype.o
  CC      lib/rbtree.o
  CC      lib/display_options.o
  CC      lib/string.o
  CC      lib/vsprintf.o
  CC      lib/div64.o
  CC      lib/misc.o
  CC      lib/driver.o
  CC      lib/bus.o
  CC      lib/parameter.o
  CC      lib/xfuncs.o
  CC      lib/getopt.o
  CC      lib/readkey.o
  CC      lib/kfifo.o
  CC      lib/libbb.o
  CC      lib/libgen.o
  CC      lib/stringlist.o
  CC      lib/recursive_action.o
  CC      lib/make_directory.o
  CC      lib/bzlib.o
  CC      lib/bzlib_crctable.o
  CC      lib/bzlib_decompress.o
  CC      lib/bzlib_huffman.o
  CC      lib/bzlib_randtable.o
  CC      lib/crc32.o
  CC      lib/readline.o
  CC      lib/glob.o
  CC      lib/notifier.o
  CC      lib/copy_file.o
  CC      lib/random.o
  CC      lib/show_progress.o
  CC      lib/process_escape_sequence.o
  LD      lib/built-in.o
  CC      fs/ramfs.o
  CC      fs/devfs.o
  CC      fs/fs.o
  LD      fs/built-in.o
  CC      /home/ringlej/git/barebox/fs/fs.o
  CC      /home/ringlej/git/barebox/fs/devfs.o
  CC      /home/ringlej/git/barebox/fs/ramfs.o
  CC      /home/ringlej/git/barebox/lib/rbtree.o
  CC      /home/ringlej/git/barebox/lib/libbb.o
  CC      /home/ringlej/git/barebox/lib/recursive_action.o
  CC      /home/ringlej/git/barebox/lib/libgen.o
  CC      /home/ringlej/git/barebox/lib/div64.o
  CC      /home/ringlej/git/barebox/lib/getopt.o
  CC      /home/ringlej/git/barebox/lib/notifier.o
  CC      /home/ringlej/git/barebox/lib/readline.o
  CC      /home/ringlej/git/barebox/lib/readline_simple.o
  CC      /home/ringlej/git/barebox/lib/bus.o
  CC      /home/ringlej/git/barebox/lib/readkey.o
  CC      /home/ringlej/git/barebox/lib/random.o
  CC      /home/ringlej/git/barebox/lib/bzlib.o
  CC      /home/ringlej/git/barebox/lib/kfifo.o
  CC      /home/ringlej/git/barebox/lib/stringlist.o
  CC      /home/ringlej/git/barebox/lib/ctype.o
  CC      /home/ringlej/git/barebox/lib/process_escape_sequence.o
  CC      /home/ringlej/git/barebox/lib/driver.o
  CC      /home/ringlej/git/barebox/lib/misc.o
  CC      /home/ringlej/git/barebox/lib/bzlib_crctable.o
  CC      /home/ringlej/git/barebox/lib/copy_file.o
  CC      /home/ringlej/git/barebox/lib/string.o
  CC      /home/ringlej/git/barebox/lib/bzlib_randtable.o
  CC      /home/ringlej/git/barebox/lib/glob.o
  CC      /home/ringlej/git/barebox/lib/vsprintf.o
  CC      /home/ringlej/git/barebox/lib/show_progress.o
  CC      /home/ringlej/git/barebox/lib/crc32.o
  CC      /home/ringlej/git/barebox/lib/make_directory.o
  CC      /home/ringlej/git/barebox/lib/bzlib_huffman.o
  CC      /home/ringlej/git/barebox/lib/parameter.o
  CC      /home/ringlej/git/barebox/lib/display_options.o
  CC      /home/ringlej/git/barebox/lib/bzlib_decompress.o
  CC      /home/ringlej/git/barebox/lib/xfuncs.o
  CC      /home/ringlej/git/barebox/scripts/mod/sumversion.o
/home/ringlej/git/barebox/scripts/mod/sumversion.c:1:24: error: netinet/in.h: No such file or directory
/home/ringlej/git/barebox/scripts/mod/sumversion.c:5:20: error: stdint.h: No such file or directory
/home/ringlej/git/barebox/scripts/mod/sumversion.c:7:19: error: ctype.h: No such file or directory
/home/ringlej/git/barebox/scripts/mod/sumversion.c:10:20: error: limits.h: No such file or directory
In file included from /home/ringlej/git/barebox/scripts/mod/sumversion.c:11:
/home/ringlej/git/barebox/scripts/mod/modpost.h:5:23: error: sys/types.h: No such file or directory
/home/ringlej/git/barebox/scripts/mod/modpost.h:6:22: error: sys/stat.h: No such file or directory
/home/ringlej/git/barebox/scripts/mod/modpost.h:7:22: error: sys/mman.h: No such file or directory
/home/ringlej/git/barebox/scripts/mod/modpost.h:9:20: error: unistd.h: No such file or directory
/home/ringlej/git/barebox/scripts/mod/modpost.h:21:1: warning: "ELF_ST_BIND" redefined
In file included from /home/ringlej/git/barebox/scripts/mod/modpost.h:10,
                 from /home/ringlej/git/barebox/scripts/mod/sumversion.c:11:
include/elf.h:119:1: warning: this is the location of the previous definition
In file included from /home/ringlej/git/barebox/scripts/mod/sumversion.c:11:
/home/ringlej/git/barebox/scripts/mod/modpost.h:22:1: warning: "ELF_ST_TYPE" redefined
In file included from /home/ringlej/git/barebox/scripts/mod/modpost.h:10,
                 from /home/ringlej/git/barebox/scripts/mod/sumversion.c:11:
include/elf.h:120:1: warning: this is the location of the previous definition
In file included from /home/ringlej/git/barebox/scripts/mod/sumversion.c:11:
/home/ringlej/git/barebox/scripts/mod/modpost.h:122: error: expected specifier-qualifier-list before 'Elf32_Section'
/home/ringlej/git/barebox/scripts/mod/sumversion.c: In function 'le32_to_cpu_array':
/home/ringlej/git/barebox/scripts/mod/sumversion.c:75: warning: implicit declaration of function 'ntohl'
/home/ringlej/git/barebox/scripts/mod/sumversion.c: In function 'cpu_to_le32_array':
/home/ringlej/git/barebox/scripts/mod/sumversion.c:83: warning: implicit declaration of function 'htonl'
/home/ringlej/git/barebox/scripts/mod/sumversion.c: In function 'parse_file':
/home/ringlej/git/barebox/scripts/mod/sumversion.c:273: warning: implicit declaration of function 'isspace'
/home/ringlej/git/barebox/scripts/mod/sumversion.c: In function 'parse_source_files':
/home/ringlej/git/barebox/scripts/mod/sumversion.c:303: warning: implicit declaration of function 'malloc'
/home/ringlej/git/barebox/scripts/mod/sumversion.c:303: warning: passing argument 1 of 'do_nofail' makes pointer from integer without a cast
/home/ringlej/git/barebox/scripts/mod/modpost.h:89: note: expected 'void *' but argument is of type 'int'
/home/ringlej/git/barebox/scripts/mod/sumversion.c:314: warning: passing argument 1 of 'do_nofail' makes pointer from integer without a cast
/home/ringlej/git/barebox/scripts/mod/modpost.h:89: note: expected 'void *' but argument is of type 'int'
/home/ringlej/git/barebox/scripts/mod/sumversion.c:372: warning: implicit declaration of function 'free'
/home/ringlej/git/barebox/scripts/mod/sumversion.c: In function 'get_src_version':
/home/ringlej/git/barebox/scripts/mod/sumversion.c:385: error: 'PATH_MAX' undeclared (first use in this function)
/home/ringlej/git/barebox/scripts/mod/sumversion.c:385: error: (Each undeclared identifier is reported only once
/home/ringlej/git/barebox/scripts/mod/sumversion.c:385: error: for each function it appears in.)
/home/ringlej/git/barebox/scripts/mod/sumversion.c:386: warning: implicit declaration of function 'getenv'
/home/ringlej/git/barebox/scripts/mod/sumversion.c:386: warning: initialization makes pointer from integer without a cast
/home/ringlej/git/barebox/scripts/mod/sumversion.c:385: warning: unused variable 'filelist'
/home/ringlej/git/barebox/scripts/mod/sumversion.c: In function 'write_version':
/home/ringlej/git/barebox/scripts/mod/sumversion.c:437: warning: implicit declaration of function 'open'
/home/ringlej/git/barebox/scripts/mod/sumversion.c:444: warning: implicit declaration of function 'lseek'
/home/ringlej/git/barebox/scripts/mod/sumversion.c:444: error: 'SEEK_SET' undeclared (first use in this function)
/home/ringlej/git/barebox/scripts/mod/sumversion.c:450: warning: implicit declaration of function 'write'
/home/ringlej/git/barebox/scripts/mod/sumversion.c:456: warning: implicit declaration of function 'close'
make[2]: *** [/home/ringlej/git/barebox/scripts/mod/sumversion.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [common] Error 2
make[1]: Leaving directory `/home/ringlej/git/barebox'
make: *** [all] Error 2