s3: make unresolved symbols in libs throw errors

[nivanova/samba-autobuild/.git] / source3 / configure.in

diff --git a/source3/configure.in b/source3/configure.in
index 69596df46c4c10f4818a3c4aeac2f0a494c90a65..80a347cd4e1461e161813571695e006eba2804f6 100644 (file)
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -377,6 +377,10 @@ esac
 
 DYNEXP=
 AC_SUBST(DYNEXP)
+LDSHFLAGS_Z_DEFS=
+AC_SUBST(LDSHFLAGS_Z_DEFS)
+LDSHFLAGS_Z_NODEFS=
+AC_SUBST(LDSHFLAGS_Z_NODEFS)
 
 dnl Add modules that have to be built by default here
 dnl These have to be built static:
@@ -1557,10 +1561,9 @@ DSO_EXPORTS=""
                                AC_DEFINE(LINUX,1,[Whether the host os is linux]) ;;
                        esac
                        BLDSHARED="true"
+                       LDSHFLAGS="-shared -Wl,-Bsymbolic"
                        if test "${ac_cv_gnu_ld_no_default_allow_shlib_undefined}" = "yes"; then
-                               LDSHFLAGS="-shared -Wl,-Bsymbolic -Wl,--allow-shlib-undefined"
-                       else
-                               LDSHFLAGS="-shared -Wl,-Bsymbolic"
+                               LDSHFLAGS_Z_NODEFS="-Wl,--allow-shlib-undefined"
                        fi
                        DYNEXP="-Wl,--export-dynamic"
                        PICFLAG="-fPIC"
@@ -1772,6 +1775,27 @@ if test x"${ac_cv_prog_gnu_ld}" = x"yes"; then
        LDFLAGS="$LD_AS_NEEDED_FLAG $saved_ldflags"
 fi
 
+# for historical reasons almost all linkers don't complain about unresolved
+# symbols in shared libs. Except for the internal samba modules we want to get
+# errors when we produce a shared lib with unresolved symbols. On some
+# platforms unresolved symbols might be intended, so we might have to add
+# platform specific exceptions here.
+
+for flags in "-Wl,-z,defs" "-error_unresolved" "-Wl,-error_unresolved" ; do
+       saved_ldflags="$LDFLAGS"
+       AC_MSG_CHECKING([if $flags works])
+       LDFLAGS="$flags $saved_ldflags"
+       AC_TRY_LINK([],[],
+       [AC_MSG_RESULT([yes])
+       LDSHFLAGS_Z_DEFS=$flags
+       ldshflags_z_defs_found=yes],
+       AC_MSG_RESULT([no]))
+       LDFLAGS=$saved_ldflags
+       test x"$ldshflags_z_defs_found" = xyes && break
+done
+
+AC_MSG_CHECKING([LDSHFLAGS_Z_DEFS])
+AC_MSG_RESULT([$LDSHFLAGS_Z_DEFS])
 AC_MSG_CHECKING([LDFLAGS])
 AC_MSG_RESULT([$LDFLAGS])
 AC_MSG_CHECKING([DYNEXP])