waf: introduce reverse logic for allowing unknown symbols

Some os (ie OSX 10.6) forbids by default unknown symbols so in order to
allow them (for special case) we have no to remove linker option *but*
to add options to ask the linker to be more relax.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>

2 files changed, 9 insertions, 0 deletions

diff --git a/buildtools/wafsamba/samba_deps.py b/buildtools/wafsamba/samba_deps.py
index adeb3645ce..0bd2c6cf67 100644
--- a/buildtools/wafsamba/samba_deps.py
+++ b/buildtools/wafsamba/samba_deps.py
@@ -89,6 +89,10 @@ def build_dependencies(self):
             for f in self.env.undefined_ldflags:
                 self.ldflags.remove(f)
 
+        if getattr(self, 'allow_undefined_symbols', False) and self.env.undefined_ignore_ldflags:
+            for f in self.env.undefined_ignore_ldflags:
+                self.ldflags.append(f)
+
         debug('deps: computed dependencies for target %s: uselib=%s uselib_local=%s add_objects=%s',
               self.sname, self.uselib, self.uselib_local, self.add_objects)
 
diff --git a/wscript b/wscript
index 46773bfd86..7e9d7730ab 100755
--- a/wscript
+++ b/wscript
@@ -122,6 +122,11 @@ def configure(conf):
     if sys.platform != "openbsd4":
         conf.env.undefined_ldflags = conf.ADD_LDFLAGS('-Wl,-no-undefined', testflags=True)
 
+    if sys.platform != "openbsd4" and conf.env.undefined_ignore_ldflags == []:
+        if conf.CHECK_LDFLAGS(['-undefined', 'dynamic_lookup']):
+            conf.env.undefined_ignore_ldflags = ['-undefined', 'dynamic_lookup']
+
+
     # gentoo always adds this. We want our normal build to be as
     # strict as the strictest OS we support, so adding this here
     # allows us to find problems on our development hosts faster.