Problem: Sun Studio build errors

Solution: add compiler flags to support extensions like anonymous
structs in unions, fix casting of const, and check for suncc rather
than solaris

configure.ac

@@ -315,6 +315,12 @@ case "${host_os}" in
         ;;
 esac
 
+# Sun Studio does not like anonymous structures in unions
+if test "x$libzmq_cv_[]_AC_LANG_ABBREV[]_sun_studio_compiler" = "xyes"; then
+    CXXFLAGS="${CXXFLAGS} -features=extensions"
+    CFLAGS="${CFLAGS} -features=extensions"
+fi
+
 # Checks for libraries
 AC_CHECK_LIB([pthread], [pthread_create])
 AC_CHECK_LIB([rt], [clock_gettime])

src/atomic_ptr.hpp

@@ -266,7 +266,11 @@ struct atomic_value_t
         return (int) (ptrdiff_t) atomic_cas ((void **) &value, 0, 0
 #if defined ZMQ_ATOMIC_PTR_MUTEX
                                              ,
+#if defined __SUNPRO_CC
+                                             const_cast<mutex_t &> (sync)
+#else
                                              sync
+#endif
 #endif
         );
 #endif

src/blob.hpp

@@ -40,7 +40,7 @@
 #define ZMQ_PUSH_OR_EMPLACE_BACK emplace_back
 #define ZMQ_MOVE(x) std::move (x)
 #else
-#if defined ZMQ_HAVE_SOLARIS
+#if defined __SUNPRO_CC
 template <typename K, typename V>
 std::pair<const K, V> make_pair_fix_const (const K &k, const V &v)
 {

src/err.cpp

@@ -387,7 +387,7 @@ int zmq::wsa_error_to_errno (int errcode)
 
 #endif
 
-#ifdef HAVE_LIBUNWIND
+#if defined(HAVE_LIBUNWIND) && !defined(__SUNPRO_CC)
 
 #define UNW_LOCAL_ONLY
 #include <libunwind.h>