base: Reenable external templates in logging.h when using component build.

base/logging.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_LOGGING_H_
 #define BASE_LOGGING_H_
 #pragma once
 
 #include <cassert>
 #include <string>
@@ skipping 451 matching lines @@
 // takes ownership of the returned string.
 template<class t1, class t2>
 std::string* MakeCheckOpString(const t1& v1, const t2& v2, const char* names) {
   std::ostringstream ss;
   ss << names << " (" << v1 << " vs. " << v2 << ")";
   std::string* msg = new std::string(ss.str());
   return msg;
 }
 
 // MSVC doesn't like complex extern templates and DLLs.
-#if !defined(COMPILER_MSVC) && !defined(COMPONENT_BUILD)
+#if !defined(COMPILER_MSVC)
 // Commonly used instantiations of MakeCheckOpString<>. Explicitly instantiated
 // in logging.cc.
-extern template std::string* MakeCheckOpString<int, int>(
+extern template BASE_EXPORT std::string* MakeCheckOpString<int, int>(
     const int&, const int&, const char* names);
-extern template std::string* MakeCheckOpString<unsigned long, unsigned long>(
+extern template BASE_EXPORT
+std::string* MakeCheckOpString<unsigned long, unsigned long>(
     const unsigned long&, const unsigned long&, const char* names);
-extern template std::string* MakeCheckOpString<unsigned long, unsigned int>(
+extern template BASE_EXPORT
+std::string* MakeCheckOpString<unsigned long, unsigned int>(
     const unsigned long&, const unsigned int&, const char* names);
-extern template std::string* MakeCheckOpString<unsigned int, unsigned long>(
+extern template BASE_EXPORT
+std::string* MakeCheckOpString<unsigned int, unsigned long>(
     const unsigned int&, const unsigned long&, const char* names);
-extern template std::string* MakeCheckOpString<std::string, std::string>(
+extern template BASE_EXPORT
+std::string* MakeCheckOpString<std::string, std::string>(
     const std::string&, const std::string&, const char* name);
 #endif
 
 // Helper macro for binary operators.
 // Don't use this macro directly in your code, use CHECK_EQ et al below.
 //
 // TODO(akalin): Rewrite this so that constructs like if (...)
 // CHECK_EQ(...) else { ... } work properly.
 #define CHECK_OP(name, op, val1, val2)                          \
   if (std::string* _result =                                    \
@@ skipping 457 matching lines @@
 namespace base {
 
 class StringPiece;
 
 // Allows StringPiece to be logged.
 BASE_EXPORT std::ostream& operator<<(std::ostream& o, const StringPiece& piece);
 
 }  // namespace base
 
 #endif  // BASE_LOGGING_H_