What's the right way to do this? I currently have: AC_ARG_VAR([WORD_SIZE], [value of WORD_SIZE register [default: sizeof(long)]]) if "$ac_cv_env_WORD_SIZE_set" != set; then AC_CHECK_SIZEOF([long]) ac_cv_env_WORD_SIZE_value=SIZEOF_LONG fi
which seems to work, but I'm conscious that I'm relying on undocumented variable names (ac_cv_env_*). I can't seem to get the same effect with, for example: AC_CHECK_SIZEOF([long]) AC_SUBST([WORD_SIZE], [SIZEOF_LONG]) AC_ARG_VAR([WORD_SIZE], [value of WORD_SIZE register [default: sizeof(long)]]) (the AC_SUBST overrides whatever AC_ARG_VAR does, it seems). -- https://rrt.sc3d.org
