Hopefully fix build on Sun Studio.

src/google/protobuf/compiler/subprocess.cc

@@ -35,6 +35,7 @@
 #ifndef _WIN32
 #include <errno.h>
 #include <sys/wait.h>
+#include <signal.h>
 #endif
 
 #include <algorithm>

src/google/protobuf/extension_set.cc

@@ -138,9 +138,9 @@ void ExtensionSet::RegisterEnumExtension(const MessageLite* containing_type,
                                          EnumValidityFunc* is_valid) {
   GOOGLE_CHECK_EQ(type, WireFormatLite::TYPE_ENUM);
   ExtensionInfo info(type, is_repeated, is_packed);
-  info.enum_is_valid = CallNoArgValidityFunc;
+  info.enum_validity_check.func = CallNoArgValidityFunc;
   // See comment in CallNoArgValidityFunc() about why we use a c-style cast.
-  info.enum_is_valid_arg = (void*)is_valid;
+  info.enum_validity_check.arg = (void*)is_valid;
   Register(containing_type, number, info);
 }
 
@@ -761,7 +761,8 @@ bool ExtensionSet::ParseField(uint32 tag, io::CodedInputStream* input,
           int value;
           if (!WireFormatLite::ReadPrimitive<int, WireFormatLite::TYPE_ENUM>(
                   input, &value)) return false;
-          if (extension.enum_is_valid(extension.enum_is_valid_arg, value)) {
+          if (extension.enum_validity_check.func(
+                  extension.enum_validity_check.arg, value)) {
             AddEnum(number, WireFormatLite::TYPE_ENUM, true, value,
                     extension.descriptor);
           }
@@ -814,7 +815,8 @@ bool ExtensionSet::ParseField(uint32 tag, io::CodedInputStream* input,
         if (!WireFormatLite::ReadPrimitive<int, WireFormatLite::TYPE_ENUM>(
                 input, &value)) return false;
 
-        if (!extension.enum_is_valid(extension.enum_is_valid_arg, value)) {
+        if (!extension.enum_validity_check.func(
+                extension.enum_validity_check.arg, value)) {
           // Invalid value.  Treat as unknown.
           field_skipper->SkipUnknownEnum(number, value);
         } else if (extension.is_repeated) {

src/google/protobuf/extension_set.h

@@ -99,9 +99,9 @@ struct ExtensionInfo {
 
   union {
     struct {
-      EnumValidityFuncWithArg* enum_is_valid;
-      const void* enum_is_valid_arg;
-    };
+      EnumValidityFuncWithArg* func;
+      const void* arg;
+    } enum_validity_check;
     const MessageLite* message_prototype;
   };
 

src/google/protobuf/extension_set_heavy.cc

@@ -175,8 +175,8 @@ bool DescriptorPoolExtensionFinder::Find(int number, ExtensionInfo* output) {
           << "Extension factory's GetPrototype() returned NULL for extension: "
           << extension->full_name();
     } else if (extension->cpp_type() == FieldDescriptor::CPPTYPE_ENUM) {
-      output->enum_is_valid = ValidateEnumUsingDescriptor;
-      output->enum_is_valid_arg = extension->enum_type();
+      output->enum_validity_check.func = ValidateEnumUsingDescriptor;
+      output->enum_validity_check.arg = extension->enum_type();
     }
 
     return true;