1 files changed, 63 insertions, 0 deletions
diff --git a/common/m4/gst-function.m4 b/common/m4/gst-function.m4
new file mode 100755
index 0000000..1216621
--- /dev/null
+++ b/common/m4/gst-function.m4
@@ -0,0 +1,63 @@
+dnl
+dnl Check for compiler mechanism to show functions in debugging
+dnl copied from an Ali patch floating on the internet
+dnl
+AC_DEFUN([AG_GST_CHECK_FUNCTION],[
+  dnl #1: __PRETTY_FUNCTION__
+  AC_MSG_CHECKING(whether $CC implements __PRETTY_FUNCTION__)
+  AC_CACHE_VAL(have_pretty_function,[
+    AC_TRY_LINK([#include <stdio.h>],
+                [printf("%s", __PRETTY_FUNCTION__);],
+                have_pretty_function=yes,
+                have_pretty_function=no)
+  ])
+  AC_MSG_RESULT($have_pretty_function)
+  if test "$have_pretty_function" = yes; then
+    AC_DEFINE(HAVE_PRETTY_FUNCTION, 1,
+              [defined if the compiler implements __PRETTY_FUNCTION__])
+  fi
+
+dnl #2: __FUNCTION__
+  AC_MSG_CHECKING(whether $CC implements __FUNCTION__)
+  AC_CACHE_VAL(have_function,[
+    AC_TRY_LINK([#include <stdio.h>],
+                [printf("%s", __FUNCTION__);],
+                have_function=yes,
+                have_function=no)
+  ])
+  AC_MSG_RESULT($have_function)
+  if test "$have_function" = yes; then
+    AC_DEFINE(HAVE_FUNCTION, 1,
+              [defined if the compiler implements __FUNCTION__])
+  fi
+
+dnl #3: __func__
+  AC_MSG_CHECKING(whether $CC implements __func__)
+  AC_CACHE_VAL(have_func,[
+    AC_TRY_LINK([#include <stdio.h>],
+                [printf("%s", __func__);],
+                have_func=yes,
+                have_func=no)
+  ])
+  AC_MSG_RESULT($have_func)
+  if test "$have_func" = yes; then
+    AC_DEFINE(HAVE_FUNC, 1,
+              [defined if the compiler implements __func__])
+  fi
+
+dnl now define FUNCTION to whatever works, and fallback to ""
+  if test "$have_pretty_function" = yes; then
+    function=__PRETTY_FUNCTION__
+  else
+    if test "$have_function" = yes; then
+      function=__FUNCTION__
+    else
+      if test "$have_func" = yes; then
+        function=__func__
+      else
+        function=\"\"
+      fi
+    fi
+  fi
+  AC_DEFINE_UNQUOTED(GST_FUNCTION, $function, [macro to use to show function name])
+])