[yocto] Problems building util-linux when wide character support is disabled in distro

[Hans Beckérus]

Hi. We are having som problems building our rootfs now that our custom
distro (based on poky-tiny) no longer includes wide character support
in libc.
Here is an example of the errors we get:

| arm-poky-linux-gnueabi-libtool: link: arm-poky-linux-gnueabi-gcc
-march=armv7-a -mthumb-interwork -mfloat-abi=softfp -mtune=cortex-a9
--sysroot=/home/qhanbec/poky/build/tmp/sysroots/zynq-zc706 -std=gnu99
-fsigned-char -fno-common -Wall -Werror=sequence-point -Wextra
-Wmissing-declarations -Wmissing-parameter-type -Wmissing-prototypes
-Wno-missing-field-initializers -Wredundant-decls -Wsign-compare
-Wtype-limits -Wuninitialized -Wunused-but-set-parameter
-Wunused-but-set-variable -Wunused-parameter -Wunused-result
-Wunused-variable -O2 -pipe -g -feliminate-unused-debug-types -Wl,-O1
-Wl,--hash-style=gnu -Wl,--as-needed -o ul text-utils/ul.o  -ltinfo
| text-utils/rev.o: In function `main':
| /home/poky/build/tmp/work/cortexa9-vfp-poky-linux-gnueabi/util-linux/2.22.2-r3/util-linux-2.22.2/text-utils/rev.c:139:
undefined reference to `fgetws'
| /home/poky/build/tmp/work/cortexa9-vfp-poky-linux-gnueabi/util-linux/2.22.2-r3/util-linux-2.22.2/text-utils/rev.c:151:
undefined reference to `fgetws'
| /home//poky/build/tmp/work/cortexa9-vfp-poky-linux-gnueabi/util-linux/2.22.2-r3/util-linux-2.22.2/text-utils/rev.c:154:
undefined reference to `wcslen'
| /home/poky/build/tmp/work/cortexa9-vfp-poky-linux-gnueabi/util-linux/2.22.2-r3/util-linux-2.22.2/text-utils/rev.c:160:
undefined reference to `putwchar'
| /home/poky/build/tmp/work/cortexa9-vfp-poky-linux-gnueabi/util-linux/2.22.2-r3/util-linux-2.22.2/text-utils/rev.c:162:
undefined reference to `putwchar'
| collect2: error: ld returned 1 exit status

The problem is that util-linux still thinks we have wide character
support (from configure.ac):

AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <wchar.h>
#include <wctype.h>
#include <stdio.h>
]], [[
  wchar_t wc;
  wint_t w;
  w = fgetwc(stdin);
  if (w == WEOF) exit(1);
  wc = w;
  fputwc(wc,stdout);
]])],
[AC_DEFINE(HAVE_WIDECHAR,1,Do we have wide character support?)
])

Since no linking is performed due to x-compilation, all that this does
is basically checking if wchar.h exists or not.
And that is also were the problem is. Even if we have disabled wide
character support in eglibc, the wchar.h header files is still copied
to our sysroot!?
Is that really how it should be when DISTRO_FEATURES_LIBC does not
include 'libc-posix-clang-wchar libc-posix-wchar-io'?
Here is our DISTRO_FEATURES (as reported by bitbake -e) and build environment:

DISTRO_FEATURES="ipv4 usbhost usbgadget ${DISTRO_FEATURES_WIFI}
libc-libm libc-crypt libc-utmp libc-getlogin libc-posix-regexp
libc-inet libc-nis   sysvinit largefile nfs"

Build Configuration:
BB_VERSION        = "1.19.0"
BUILD_SYS         = "x86_64-linux"
NATIVELSBSTRING   = "SUSE-LINUX-11"
TARGET_SYS        = "arm-poky-linux-gnueabi"
MACHINE           = "zynq-zc706"
DISTRO            = "poky-chris"
DISTRO_VERSION    = "1.4+snapshot-20130917"
TUNE_FEATURES     = "armv7a vfp cortexa9"
TARGET_FPU        = "vfp"
meta
meta-yocto
meta-yocto-bsp    = "master:3b38c898a4647c6a639d0dbd416b0bbacbf278f5"
meta-oe           = "master:7c292ce28756824b1fa377d516aedd979fa41f19"

Any ideas how what might be wrong here?

Thanks.
Hans