Redesigned 'optional API' support.

This patch provides a new implementation of the optional API support defined
in asterisk/optional_api.h; this new version provides solves compatibility
issues with the use of linker version scripts for suppressing global symbols.
In addition, there is now a functional (and tested!) implementation for Mac OS/X,
so module writers no longer need to use special tests before calling optional
API functions. All future implementations must provide these same semantics,
so that module writers can rely on them.



git-svn-id: http://svn.digium.com/svn/asterisk/trunk@200519 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 8 insertions, 122 deletions

diff --git a/configure b/configure
index 95bedfd0e..926cf7f5a 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 196981 .
+# From configure.ac Revision: 197738 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.63 for asterisk 1.6.
 #
@@ -18924,12 +18924,12 @@ CFLAGS="$saved_CFLAGS"
 
 
 
-{ $as_echo "$as_me:$LINENO: checking for compiler 'attribute weak' support" >&5
-$as_echo_n "checking for compiler 'attribute weak' support... " >&6; }
+{ $as_echo "$as_me:$LINENO: checking for compiler 'attribute weakref' support" >&5
+$as_echo_n "checking for compiler 'attribute weakref' support... " >&6; }
 saved_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS -Werror"
 
-if test "x" = "x"
+if test "xweakref("foo")" = "x"
 then
 cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -18937,7 +18937,7 @@ _ACEOF
 cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
-void __attribute__((weak)) *test(void *muffin, ...) {}
+void __attribute__((weakref)) *test(void *muffin, ...) {}
 int
 main ()
 {
@@ -18968,7 +18968,7 @@ $as_echo "$ac_try_echo") >&5
 $as_echo "yes" >&6; }
 
 cat >>confdefs.h <<_ACEOF
-#define HAVE_ATTRIBUTE_weak 1
+#define HAVE_ATTRIBUTE_weakref 1
 _ACEOF
 
 else
@@ -18988,7 +18988,7 @@ _ACEOF
 cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
-void __attribute__(()) *test(void *muffin, ...) {}
+void __attribute__((weakref("foo"))) *test(void *muffin, ...) {}
 int
 main ()
 {
@@ -19019,7 +19019,7 @@ $as_echo "$ac_try_echo") >&5
 $as_echo "yes" >&6; }
 
 cat >>confdefs.h <<_ACEOF
-#define HAVE_ATTRIBUTE_weak 1
+#define HAVE_ATTRIBUTE_weakref 1
 _ACEOF
 
 else
@@ -19152,120 +19152,6 @@ CFLAGS="$saved_CFLAGS"
 
 
 
-{ $as_echo "$as_me:$LINENO: checking for compiler 'attribute alias' support" >&5
-$as_echo_n "checking for compiler 'attribute alias' support... " >&6; }
-saved_CFLAGS="$CFLAGS"
-CFLAGS="$CFLAGS -Werror"
-
-if test "xalias("foo")" = "x"
-then
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-void __attribute__((alias)) *test(void *muffin, ...) {}
-int
-main ()
-{
-
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext
-if { (ac_try="$ac_compile"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
-$as_echo "$ac_try_echo") >&5
-  (eval "$ac_compile") 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
-	 test ! -s conftest.err
-       } && test -s conftest.$ac_objext; then
-  { $as_echo "$as_me:$LINENO: result: yes" >&5
-$as_echo "yes" >&6; }
-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_ATTRIBUTE_alias 1
-_ACEOF
-
-else
-  $as_echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-	{ $as_echo "$as_me:$LINENO: result: no" >&5
-$as_echo "no" >&6; }
-
-fi
-
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-else
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-void __attribute__((alias("foo"))) *test(void *muffin, ...) {}
-int
-main ()
-{
-
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext
-if { (ac_try="$ac_compile"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
-$as_echo "$ac_try_echo") >&5
-  (eval "$ac_compile") 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } && {
-	 test -z "$ac_c_werror_flag" ||
-	 test ! -s conftest.err
-       } && test -s conftest.$ac_objext; then
-  { $as_echo "$as_me:$LINENO: result: yes" >&5
-$as_echo "yes" >&6; }
-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_ATTRIBUTE_alias 1
-_ACEOF
-
-else
-  $as_echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-	{ $as_echo "$as_me:$LINENO: result: no" >&5
-$as_echo "no" >&6; }
-
-fi
-
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-fi
-
-CFLAGS="$saved_CFLAGS"
-
-
-
 { $as_echo "$as_me:$LINENO: checking for -ffunction-sections support" >&5
 $as_echo_n "checking for -ffunction-sections support... " >&6; }
 saved_CFLAGS="${CFLAGS}"