commit 327c4cdf7578debcc140f04f03d02479771c9e11
author Doug VanLeuven <roamdad@sonic.net> Fri Dec 14 14:58:30 2012 +0200
committer David Lamparter <equinox@opensourcerouting.org> Fri Jan 11 21:50:06 2013 +0100
tree a0e02a0614f12601d8a58eeeebf9e54b27198c9f
parent b2e5bdbe10c4145f508fcf1486ffe29d5ce516f7

testzebra: pragma weak: detect systems with weak alias and provide alternative

LLVM clang does not support #pragma weak (bug 3679) on OS X. There are
other systems where the #pragma weak has varying syntax.

Added m4 file from the autoconf archives:
http://www.gnu.org/software/autoconf-archive/ax_sys_weak_alias.html

Fix up zebra/*_null.c files to use #pragma weak alias or stub functions
if not available. It's incomplete in that the different format #pragma
enable easier fixes on need.

Tested on 64bit OS X 10.7, FreeBSD 9.0 amd64 & i386 (32bit) using
gcc & clang. Tested on linux 64bit.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

zebra/redistribute_null.c

diff --git a/zebra/redistribute_null.c b/zebra/redistribute_null.c
index e57a73b..54198c8 100644
--- a/zebra/redistribute_null.c
+++ b/zebra/redistribute_null.c
@@ -6,21 +6,50 @@
 
 void zebra_redistribute_add (int a, struct zserv *b, int c)
 { return; }
+#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
 #pragma weak zebra_redistribute_delete = zebra_redistribute_add
 #pragma weak zebra_redistribute_default_add = zebra_redistribute_add
 #pragma weak zebra_redistribute_default_delete = zebra_redistribute_add
+#else
+void zebra_redistribute_delete  (int a, struct zserv *b, int c)
+{ return; }
+void zebra_redistribute_default_add (int a, struct zserv *b, int c)
+{ return; }
+void zebra_redistribute_default_delete (int a, struct zserv *b, int c)
+{ return; }
+#endif
 
 void redistribute_add (struct prefix *a, struct rib *b)
 { return; }
+#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
 #pragma weak redistribute_delete = redistribute_add
+#else
+void redistribute_delete (struct prefix *a, struct rib *b)
+{ return; }
+#endif
 
 void zebra_interface_up_update (struct interface *a)
 { return; }
+#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
 #pragma weak zebra_interface_down_update = zebra_interface_up_update
 #pragma weak zebra_interface_add_update = zebra_interface_up_update
 #pragma weak zebra_interface_delete_update = zebra_interface_up_update
+#else
+void zebra_interface_down_update  (struct interface *a)
+{ return; }
+void zebra_interface_add_update (struct interface *a)
+{ return; }
+void zebra_interface_delete_update (struct interface *a)
+{ return; }
+#endif
 
 void zebra_interface_address_add_update (struct interface *a,
 					 	struct connected *b)
 { return; }
+#ifdef HAVE_SYS_WEAK_ALIAS_PRAGMA
 #pragma weak zebra_interface_address_delete_update = zebra_interface_address_add_update
+#else
+void zebra_interface_address_delete_update (struct interface *a,
+                                                struct connected *b)
+{ return; }
+#endif