[SCM] GNU Libtool branch, master, updated. v2.4.3-38-g1acee63

[Gary V. Vaughan]

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- Log -----------------------------------------------------------------
commit 1acee63da4b98fecdb59b3ce4b67a4d5fbd21323
Author: Gary V. Vaughan <address@hidden>
Date:   Wed Nov 26 19:36:47 2014 +0000

    ltdl: fix a long standing duplicate `-ldl' bug in the link line.
    
    * m4/ltdl.m4 (LT_LIB_DLLOAD): Save contents of LIBS before
    calling AC_SEARCH_LIBS, which prepends to LIBS by default, and
    restore afterwards.  We set LIBADD_DLOPEN and LIBADD_SHL_LOAD
    so that dynamic loader libraries can be added selectively only
    where they are needed.
    * NEWS: Update.
    
    Signed-off-by: Gary V. Vaughan <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 NEWS       |   11 +++++++++++
 m4/ltdl.m4 |    2 ++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/NEWS b/NEWS
index 75da6ea..2782511 100644
--- a/NEWS
+++ b/NEWS
@@ -12,10 +12,21 @@ NEWS - list of user-visible changes between releases of GNU 
Libtool
 
   - Installation of 'libtoolize' once again obeys '--program-prefix',
     '--program-suffix' and '--program-transform-name' configure options.
+
   - `libtoolize` doesn't remove any files that it can't reinstall,
     including old versions of the snippet directory, and gnulib's
     version of the argz module and supporting files.
 
+** Important incompatible changes:
+
+  - LT_LIB_DLLOAD no longer prepends -ldl or -ldld to LIBS, causing
+    duplicate occurrences in libltdl link lines.  If you need to
+    add a library for dlopen() or shl_load() in your Makefile, then
+    use $(LIBADD_DLOPEN) or $(LIBADD_SHL_LOAD) respectively.  If you
+    are using libltdl, this all happens automatically, and the only
+    difference you'll see is no more duplicated library names in the
+    verbose link line.
+
 ** Changes in supported systems or compilers:
 
   - Preliminary support for tcc on linux*.  Although it already worked
diff --git a/m4/ltdl.m4 b/m4/ltdl.m4
index eeb37ac..4119844 100644
--- a/m4/ltdl.m4
+++ b/m4/ltdl.m4
@@ -651,6 +651,7 @@ LT_DLLOADERS=
 AC_SUBST([LT_DLLOADERS])
 
 AC_LANG_PUSH([C])
+lt_dlload_save_LIBS=$LIBS
 
 LIBADD_DLOPEN=
 AC_SEARCH_LIBS([dlopen], [dl],
@@ -734,6 +735,7 @@ dnl This isn't used anymore, but set it for backwards 
compatibility
 LIBADD_DL="$LIBADD_DLOPEN $LIBADD_SHL_LOAD"
 AC_SUBST([LIBADD_DL])
 
+LIBS=$lt_dlload_save_LIBS
 AC_LANG_POP
 ])# LT_LIB_DLLOAD
 


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