CFLAGS="-mthumb -mcpu=cortex-m3"
AC_MSG_CHECKING([if ]$ARM_CC[ supports cortex-m3])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int i;])],
[HAVE_ARM_M3_CC=yes],
[HAVE_ARM_M3_CC=no])
CFLAGS="-mthumb -mcpu=cortex-m3"
AC_MSG_CHECKING([if ]$ARM_CC[ supports cortex-m3])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int i;])],
[HAVE_ARM_M3_CC=yes],
[HAVE_ARM_M3_CC=no])