gnulib-tool and line length: gl_LIBOBJS

[Ralf Wildenhues]

The combined length of object names in gl_LIBOBJS can get pretty close
to the line limit of some 'make' implementations, or, FWIW, the portable
text file format limit.

As Autoconf 2.60 allows newlines in substituted values, there's an easy
fix for users of new Autoconf.  WDYT?

Cheers,
Ralf

2007-01-28  Ralf Wildenhues  <address@hidden>

        * gnulib-tool (func_emit_initmacro_end): If Autoconf-2.60 or
        newer is required anyway, line-wrap gl_LIBOBJS and gl_LTLIBOBJS
        to prevent exceeding portable line length limitations.

Index: gnulib-tool
===================================================================
RCS file: /cvsroot/gnulib/gnulib/gnulib-tool,v
retrieving revision 1.218
diff -u -r1.218 gnulib-tool
--- gnulib-tool 27 Jan 2007 13:53:54 -0000      1.218
+++ gnulib-tool 28 Jan 2007 12:18:21 -0000
@@ -1471,8 +1471,18 @@
   echo "      # Remove the extension."
   echo "      sed_drop_objext='s/\\.o\$//;s/\\.obj\$//'"
   echo "      for i in \`for i in \$${macro_prefix}_LIBOBJS; do echo \"\$i\"; 
done | sed \"\$sed_drop_objext\" | sort | uniq\`; do"
-  echo "        ${macro_prefix}_libobjs=\"\$${macro_prefix}_libobjs 
\$i.\$ac_objext\""
-  echo "        ${macro_prefix}_ltlibobjs=\"\$${macro_prefix}_ltlibobjs 
\$i.lo\""
+  case $autoconf_minversion in
+  2.[6-9][0-9] | [3-9].*)
+    echo "        ${macro_prefix}_libobjs=\"\$${macro_prefix}_libobjs \\\\
+ \$i.\$ac_objext\""
+    echo "        ${macro_prefix}_ltlibobjs=\"\$${macro_prefix}_ltlibobjs \\\\
+ \$i.lo\""
+    ;;
+  *)
+    echo "        ${macro_prefix}_libobjs=\"\$${macro_prefix}_libobjs 
\$i.\$ac_objext\""
+    echo "        ${macro_prefix}_ltlibobjs=\"\$${macro_prefix}_ltlibobjs 
\$i.lo\""
+    ;;
+  esac
   echo "      done"
   echo "    fi"
   echo "    AC_SUBST([${macro_prefix}_LIBOBJS], [\$${macro_prefix}_libobjs])"