dnl Check signed right shift implementation AC_MSG_CHECKING([whether signed right shift is sign extended]) AC_TRY_RUN([int main(void){int a=-1;int b=a>>1;return(a!=b);}], [have_signed_rightshift_extended=yes], [have_signed_rightshift_extended=no], [have_signed_rightshift_extended=no]) if test $have_signed_rightshift_extended = yes; then AC_DEFINE([HAVE_SAR], 1, [Define signed right shift implementation]) fi AC_MSG_RESULT([$have_signed_rightshift_extended]);