libopts and gnulib?

[Karl Berry]

Hi everyone,

Bruce Korb implemented a library for straightforward config file
parsing (among other things).  We thought it would make sense to use it
for GNU Hello, as an example of how it can be done.

Of course, it involves a new Autoconf macro to test whether the library
is available.  And of course again, I don't want that macro to live in
GNU Hello, since the goal is not Hello functionality, it's to be an
example.  So I want it to be in a common place.  Which I guess is
gnulib.

Does all that sound reasonable?  If so, my question is how to do this --
I guess define a new module.  I confess I am not clear on the exact
steps to do this.  Should have paid better attention in school, I know ...

Following is the macro Bruce wrote; he named the file libopts.m4, since
that's the name of the library.  http://directory.fsf.org/GNU/libopts.html
(I guess "; then" would be preferred to "<newline>then"?)

Thanks,
karl

+AC_DEFUN([ag_FIND_LIBOPTS],
+    [if test "X${ac_cv_header_autoopts_options_h}" == Xno
+    then
+      :
+    else
+      f=`autoopts-config cflags` 2>/dev/null
+      test X"${f}" = X && f=`libopts-config cflags` 2>/dev/null
+      if test X"${f}" = X
+      then
+        :
+      else
+        AC_DEFINE([HAVE_LIBOPTS],[1],[define if we can find libopts])
+        CFLAGS="${CFLAGS} ${f}"
+        f=`autoopts-config ldflags` 2>/dev/null
+        test X"${f}" = X && f=`libopts-config ldflags` 2>/dev/null
+        LIBS="${LIBS} ${f}"
+      fi
+    fi])