Re: getline AC_LIBOBJs

[Akim Demaille]

 > A more general solution in Autoconf would be 2. writing a wrapper
 > function that checked and set a shell variable based on the argument to
 > AC_LIBOBJ or 3. writing an AC_LIBOBJ substitute that greps $LIBOBJ for
 > the argument before adding it to the variable.

I'm installing the following in Autoconf, which, hopefully, we should
be able to release RSN :(

Index: ChangeLog
from  Akim Demaille  <address@hidden>

        * lib/autoconf/general.m4 (_AC_LIBOBJ): Don't insert twice the
        same object file in $LIBOBJS.
        Reported by Alexandre Duret-Lutz & Derek Robert Price.
        * doc/autoconf.texi (Generic Functions): Adjust.


Index: NEWS
===================================================================
RCS file: /cvsroot/autoconf/autoconf/NEWS,v
retrieving revision 1.314
diff -u -u -r1.314 NEWS
--- NEWS 20 Oct 2003 16:18:26 -0000 1.314
+++ NEWS 23 Oct 2003 07:47:21 -0000
@@ -10,6 +10,10 @@
 ** New macros
   AC_LANG_WERROR
 
+** AC_LIBOBJS
+  No longer includes twice the same file in LIBOBJS if invoked
+  multiple times.
+
 * Major changes in Autoconf 2.57f
 
   Released 2003-10-01, by Akim Demaille.
Index: doc/autoconf.texi
===================================================================
RCS file: /cvsroot/autoconf/autoconf/doc/autoconf.texi,v
retrieving revision 1.770
diff -u -u -r1.770 autoconf.texi
--- doc/autoconf.texi 20 Oct 2003 16:18:26 -0000 1.770
+++ doc/autoconf.texi 23 Oct 2003 07:47:22 -0000
@@ -4261,9 +4261,9 @@
 to replace a missing or broken implementation of @var{function}.
 
 Technically, it adds @address@hidden to the output
-variable @code{LIBOBJS} and calls @code{AC_LIBSOURCE} for
address@hidden@var{function}.c}.  You should not directly change @code{LIBOBJS},
-since this is not traceable.
+variable @code{LIBOBJS} if it is not already in, and calls
address@hidden for @address@hidden  You should not
+directly change @code{LIBOBJS}, since this is not traceable.
 @end defmac
 
 @defmac AC_LIBSOURCE (@var{file})
Index: lib/autoconf/general.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/general.m4,v
retrieving revision 1.820
diff -u -u -r1.820 general.m4
--- lib/autoconf/general.m4 20 Oct 2003 16:18:26 -0000 1.820
+++ lib/autoconf/general.m4 23 Oct 2003 07:47:22 -0000
@@ -2409,7 +2409,14 @@
               [AC_LIBSOURCE([$1.c])],
               [$2])dnl
 AC_SUBST([LIB@&address@hidden)dnl
-LIB@&address@hidden"$LIB@&address@hidden $1.$ac_objext"])
+case $LIB@&address@hidden in
+    "$1.$ac_objext"   | \
+  *" $1.$ac_objext"   | \
+    "$1.$ac_objext "* | \
+  *" $1.$ac_objext "* ) ;;
+  *) LIB@&address@hidden"$LIB@&address@hidden $1.$ac_objext" ;;
+esac
+])