--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/config/ax_check_export_capability.m4	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,61 @@
+# @synopsis AX_CHECK_EXPORT_CAPABILITY
+#
+# Does the compiler support the exporting of library symbols?
+# @version 1.0    Jan 31 2009
+# @author Steve Underwood
+#
+# Permission to use, copy, modify, distribute, and sell this file for any 
+# purpose is hereby granted without fee, provided that the above copyright 
+# and this permission notice appear in all copies.  No representations are
+# made about the suitability of this software for any purpose.  It is 
+# provided "as is" without express or implied warranty.
+
+AC_DEFUN([AX_CHECK_EXPORT_CAPABILITY],
+[AC_CACHE_CHECK([if $1 supports library symbol export], 
+    ac_cv_symbol_export_capability,
+
+[# Initialize to unknown
+ac_cv_symbol_export_capability="no"
+
+case "${ax_cv_c_compiler_vendor}" in
+gnu)
+    save_CFLAGS="${CFLAGS}"
+    CFLAGS="${CFLAGS} -fvisibility=hidden"
+    AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM(
+            [int foo __attribute__ ((visibility("default")));],
+            [;]
+        )],
+
+        [AC_MSG_RESULT([yes])
+         COMP_VENDOR_CFLAGS="-fvisibility=hidden -DSWITCH_API_VISIBILITY=1 -DHAVE_VISIBILITY=1 $COMP_VENDOR_CFLAGS"
+         COMP_VENDOR_CXXFLAGS="-fvisibility=hidden -DSWITCH_API_VISIBILITY=1 -DHAVE_VISIBILITY=1 $COMP_VENDOR_CXXFLAGS"
+         ac_cv_symbol_export_capability="yes"],
+
+        [AC_MSG_RESULT([no])]
+    )
+    CFLAGS="${save_CFLAGS}"
+    ;;
+
+sun)
+    save_CFLAGS="${CFLAGS}"
+    CFLAGS="${CFLAGS} -xldscope=hidden"
+    AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM(
+            [int foo __attribute__ ((visibility("default")));],
+            [;]
+        )],
+
+        [AC_MSG_RESULT([yes])
+         COMP_VENDOR_CFLAGS="-xldscope=hidden -DSWITCH_API_VISIBILITY=1 -DHAVE_VISIBILITY=1 $COMP_VENDOR_CFLAGS"
+         COMP_VENDOR_CXXFLAGS="-xldscope=hidden -DSWITCH_API_VISIBILITY=1 -DHAVE_VISIBILITY=1 $COMP_VENDOR_CXXFLAGS"
+         ac_cv_symbol_export_capability="yes"],
+
+        [AC_MSG_RESULT([no])]
+    )
+    CFLAGS="${save_CFLAGS}"
+    ;;
+
+esac])
+AS_IF([test AS_VAR_GET(ac_cv_symbol_export_capability) = yes], [$2], [$3])[]dnl
+]) # AX_CHECK_EXPORT_CAPABILITY