s3:configure: use --aѕ-needed linker option when supported

Based on a patch from Andreas Schneider but modified that --aѕ-needed is also
used when own libs are not build shared (--enable-shared). Also change order of
options so that user supplied LDFLAGS are put *after* the automatic --aѕ-needed
flag. This way it's pollible to force not use as-needed by setting LDFLAGS
environment variable to "-Wl,--no-as-needed".

diff --git a/source3/configure.in b/source3/configure.in
index 93de38dcc84a2576c0e2fb568811973c7dbdda5f..7e4ae87757f66bccec0fb2f044f34c52c2f18eda 100644 (file)
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -1706,6 +1706,23 @@ fi
 
 AC_MSG_RESULT($BLDSHARED)
 
+if test x"${ac_cv_prog_gnu_ld}" = x"yes"; then
+       saved_ldflags="$LDFLAGS"
+       AC_MSG_CHECKING([if --as-needed works])
+       LDFLAGS="--as-needed $saved_ldflags"
+       AC_TRY_LINK([],[],
+               [AC_MSG_RESULT([yes])
+               LD_AS_NEEDED_FLAG=--as-needed],
+               AC_MSG_RESULT([no]))
+       AC_MSG_CHECKING([if -Wl,--as-needed works])
+       LDFLAGS="-Wl,--as-needed $saved_ldflags"
+       AC_TRY_LINK([],[],
+               [AC_MSG_RESULT([yes])
+               LD_AS_NEEDED_FLAG=-Wl,--as-needed],
+               AC_MSG_RESULT([no]))
+       LDFLAGS="$LD_AS_NEEDED_FLAG $saved_ldflags"
+fi
+
 AC_MSG_CHECKING([LDFLAGS])
 AC_MSG_RESULT([$LDFLAGS])
 AC_MSG_CHECKING([DYNEXP])