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, 20 insertions, 35 deletions

diff --git a/include/asterisk/autoconfig.h.in b/include/asterisk/autoconfig.h.in
index 33b6d2f49..e11ea6b1f 100644
--- a/include/asterisk/autoconfig.h.in
+++ b/include/asterisk/autoconfig.h.in
@@ -94,9 +94,6 @@
 /* Define to 1 if you have the `atexit' function. */
 #undef HAVE_ATEXIT
 
-/* Define to 1 if your GCC C compiler supports the 'alias' attribute. */
-#undef HAVE_ATTRIBUTE_alias
-
 /* Define to 1 if your GCC C compiler supports the 'always_inline' attribute.
    */
 #undef HAVE_ATTRIBUTE_always_inline
@@ -123,12 +120,12 @@
    attribute. */
 #undef HAVE_ATTRIBUTE_warn_unused_result
 
-/* Define to 1 if your GCC C compiler supports the 'weak' attribute. */
-#undef HAVE_ATTRIBUTE_weak
-
 /* Define to 1 if your GCC C compiler supports the 'weak_import' attribute. */
 #undef HAVE_ATTRIBUTE_weak_import
 
+/* Define to 1 if your GCC C compiler supports the 'weakref' attribute. */
+#undef HAVE_ATTRIBUTE_weakref
+
 /* Define this to indicate the ${BKTR_DESCRIP} library */
 #undef HAVE_BKTR
 
@@ -1214,9 +1211,6 @@
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 
-/* Define to 1 if the C compiler supports function prototypes. */
-#undef PROTOTYPES
-
 /* Define to necessary symbol if this constant uses a non-standard name on
    your system. */
 #undef PTHREAD_CREATE_JOINABLE
@@ -1233,11 +1227,6 @@
 /* Define to the type of arg 5 for `select'. */
 #undef SELECT_TYPE_ARG5
 
-/* Define to 1 if the `setvbuf' function takes the buffering type as its
-   second argument and the buffer pointer as the third, as on System V before
-   release 3. */
-#undef SETVBUF_REVERSED
-
 /* The size of `int', as computed by sizeof. */
 #undef SIZEOF_INT
 
@@ -1258,20 +1247,30 @@
 /* Define to 1 if your <sys/time.h> declares `struct tm'. */
 #undef TM_IN_SYS_TIME
 
-/* Define to 1 if on AIX 3.
-   System headers sometimes define this.
-   We just want to avoid a redefinition error message.  */
+/* Enable extensions on AIX 3, Interix.  */
 #ifndef _ALL_SOURCE
 # undef _ALL_SOURCE
 #endif
-
-/* Number of bits in a file offset, on hosts where this is settable. */
-#undef _FILE_OFFSET_BITS
-
 /* Enable GNU extensions on systems that have them.  */
 #ifndef _GNU_SOURCE
 # undef _GNU_SOURCE
 #endif
+/* Enable threading extensions on Solaris.  */
+#ifndef _POSIX_PTHREAD_SEMANTICS
+# undef _POSIX_PTHREAD_SEMANTICS
+#endif
+/* Enable extensions on HP NonStop.  */
+#ifndef _TANDEM_SOURCE
+# undef _TANDEM_SOURCE
+#endif
+/* Enable general extensions on Solaris.  */
+#ifndef __EXTENSIONS__
+# undef __EXTENSIONS__
+#endif
+
+
+/* Number of bits in a file offset, on hosts where this is settable. */
+#undef _FILE_OFFSET_BITS
 
 /* Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2). */
 #undef _LARGEFILE_SOURCE
@@ -1289,20 +1288,6 @@
 /* Define to 1 if you need to in order for `stat' and other things to work. */
 #undef _POSIX_SOURCE
 
-/* Enable extensions on Solaris.  */
-#ifndef __EXTENSIONS__
-# undef __EXTENSIONS__
-#endif
-#ifndef _POSIX_PTHREAD_SEMANTICS
-# undef _POSIX_PTHREAD_SEMANTICS
-#endif
-#ifndef _TANDEM_SOURCE
-# undef _TANDEM_SOURCE
-#endif
-
-/* Define like PROTOTYPES; this can be used by system headers. */
-#undef __PROTOTYPES
-
 /* Define to empty if `const' does not conform to ANSI C. */
 #undef const