acinclude.m4 (GLIBCXX_CHECK_LINKER_FEATURES): Verbose ld version reporting.

2006-01-20  Benjamin Kosnik  <bkoz@redhat.com>

	* acinclude.m4 (GLIBCXX_CHECK_LINKER_FEATURES): Verbose ld version
	reporting.  Disable --gc-sections for old binutils, by version.
	* configure: Regenerate.

From-SVN: r110045

libstdc++-v3/ChangeLog

+2006-01-20  Benjamin Kosnik  <bkoz@redhat.com>
+
+	* acinclude.m4 (GLIBCXX_CHECK_LINKER_FEATURES): Verbose ld version
+	reporting.  Disable --gc-sections for old binutils, by version.
+	* configure: Regenerate.
+
 2006-01-20  Joseph S. Myers  <joseph@codesourcery.com>
 
 	PR libstdc++/25524

libstdc++-v3/acinclude.m4

@@ -222,16 +222,23 @@ AC_DEFUN([GLIBCXX_CHECK_LINKER_FEATURES], [
 
   # Start by getting the version number.  I think the libtool test already
   # does some of this, but throws away the result.
+  AC_MSG_CHECKING([for ld version])
   changequote(,)
   ldver=`$LD --version 2>/dev/null | head -1 | \
          sed -e 's/GNU ld version \([0-9.][0-9.]*\).*/\1/'`
   changequote([,])
   glibcxx_gnu_ld_version=`echo $ldver | \
          $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
+  AC_MSG_RESULT($glibcxx_gnu_ld_version)
 
   # Set --gc-sections.
-  if test x"$with_gnu_ld" = x"yes"; then
-    # GNU ld it is!  Joy and bunny rabbits!
+  glibcxx_gcsections_min_ld=21602
+  if test x"$with_gnu_ld" = x"yes" && 
+	test $glibcxx_gnu_ld_version -gt $glibcxx_gcsections_min_ld ; then
+
+    # Sufficiently young GNU ld it is!  Joy and bunny rabbits!
+    # NB: This flag only works reliably after 2.16.1. Configure tests
+    # for this are difficult, so hard wire a value that should work.
 
     # All these tests are for C++, but run with the "C" compiler driver.
     # Need to do this so that g++ won't try to link in libstdc++/libsupc++.