[Libevent-users] macosx, __attribute__ compile error

[Jerry <jerryyhom@xxxxxxxxx>]

Hello.  I am trying to compile libevent 2.1.10 on MacOS X 10.9 with 
Xcode 5.1.  A warning and error message was generated and is appended below.

The compiler does not seem to expand or define the __attribute__ macro. 
The EVUTIL_FALLTHROUGH macro is defined via EVUTIL_HAS_ATTRIBUTE, which 
is simply a wrapper for __has_attribute, which is a feature of clang. 
The comment says that clang 3.2-3.5 has a bug with __has_attribute, does 
the bug continue even in clang 5.1?

====

  CC       bufferevent_filter.lo
bufferevent_filter.c:616:3: warning: declaration does not declare anything
      [-Wmissing-declarations]
                EVUTIL_FALLTHROUGH;
                ^~~~~~~~~~~~~~~~~~
./util-internal.h:347:28: note: expanded from macro 'EVUTIL_FALLTHROUGH'
#define EVUTIL_FALLTHROUGH __attribute__((fallthrough))
                           ^~~~~~~~~~~~~
bufferevent_filter.c:619:3: error: expected expression
                EVUTIL_FALLTHROUGH;
                ^
./util-internal.h:347:28: note: expanded from macro 'EVUTIL_FALLTHROUGH'
#define EVUTIL_FALLTHROUGH __attribute__((fallthrough))
                           ^
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