ax_c_arithmetic_rshift

Checks if the right shift operation is arithmetic.

This macro uses compile-time detection and so is cross-compile ready.

AC_DEFUN([AX_C_ARITHMETIC_RSHIFT], [
  AC_CACHE_CHECK([whether right shift operation is arithmetic],
                 [ax_cv_c_arithmetic_rshift],
                 [AC_COMPILE_IFELSE([[int dummy[((-1 >> 1) < 0) ? 1 : -1];]],
                                    [ax_cv_c_arithmetic_rshift=yes],
                                    [ax_cv_c_arithmetic_rshift=no])])
  if test "x$ax_cv_c_arithmetic_rshift" = xyes; then
    AC_DEFINE([HAVE_ARITHMETIC_RSHIFT], [1],
              [Define to 1 if the right shift operation is arithmetic.])
  fi
])

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