Fix endianness detection with gcc 4.6 -flto -fwhole-program

Trying to build Qt with gcc 4.6 and the -flto optimization enabled
fails at ./configure state because the endianness can't be detected.
With -flto in QMAKE_CFLAGS and -fwhole-program in QMAKE_LFLAGS_APP,
gcc 4.6 manages to compute msb_bigendian[1] == lsb_littleendian[1] at
build time and reduces main() to "return 1;", throwing away the bits
being looked for.

Treating the short[] arrays as "code" and trying to actually run them
prevents even the -fwhole-program optimizer from kicking them out, and
since the endian test isn't actually run, doesn't break anything.

Merge-request: 1130
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

0 files changed, 0 insertions, 0 deletions