Output: Add annotate() to function declaration attributes=""

While CastXML cannot support the `gccxml()` attribute because Clang does
not define it, we can support the `annotate()` attribute that Clang
provides for arbitrary string annotations.  This should fill the same
use case as the `gccxml()` attribute did for clients.

GitHub-Issue: 25

1 files changed, 1 insertions, 0 deletions

diff --git a/test/input/Function-annotate.cxx b/test/input/Function-annotate.cxx
new file mode 100644
index 0000000..d7aaf79
--- /dev/null
+++ b/test/input/Function-annotate.cxx
@@ -0,0 +1 @@
+__attribute__ ((annotate ("an annotation"))) void start(int);