Fix visibility attribute for compiling

Change-Id: Icee8d2de67d10a2590695aabd3a4981d45e10e4e
Reviewed-on: http://review.couchbase.org/13216
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>

m4/couchbase.m4

@@ -36,7 +36,7 @@ AC_DEFUN([COUCHBASE_GENERIC_COMPILER], [
   GCC_CXX_OPTIMIZE="-O3"
   GCC_C_DEBUG="-g"
   GCC_CXX_DEBUG="-g"
-  GCC_VISIBILITY=-fvisibility=hidden
+  GCC_VISIBILITY="-DHAVE_VISIBILITY=1 -fvisibility=hidden"
   GCC_CPPFLAGS="-pipe -D_THREAD_SAFE -D_GNU_SOURCE"
   GCC_CFLAGS="-std=gnu99"
   GCC_CXXFLAGS=""
@@ -113,7 +113,7 @@ AC_DEFUN([COUCHBASE_GENERIC_COMPILER], [
         CXX_COMPILER_WARNINGS="$SPRO_CXX_COMPILER_WARNINGS"
       ])
 
-  AM_CPPFLAGS="$AM_CPPFLAGS -I\${top_srcdir}/include"
+  AM_CPPFLAGS="$AM_CPPFLAGS -I\${top_srcdir}/include $VISIBILITY"
   AM_LDFLAGS="$AM_LDFLAGS $VISIBILITY"