On Fri, Sep 2, 2022, at 2:03 PM, aotto wrote: > Hi, > > I use autoconf to config my application. My problem is that I require a > macro with > > #define NAME 1 > > or > > #define NAME 0 > > autoconf / autoheader uses for '#define NAME 0' the value '#undef NAME' This ought to work: AS_IF([test x"$ac_cv_condition_for_NAME" = xyes], [AC_DEFINE([NAME], [1], [Explanation of NAME.])], [AC_DEFINE([NAME], [0], [Explanation of NAME.])]) And so should this: AS_IF([test x"$ac_cv_condition_for_NAME" = xyes], [value_NAME=1], [value_NAME=0]) AC_DEFINE_UNQUOTED([NAME], [$value_NAME], [Explanation of NAME.]) If neither of those works, we're going to need to see a self-contained configure.ac that demonstrates exactly what you're trying to do, because the problem must be more complicated than just how you're using AC_DEFINE. zw
