Supports building gtest as a DLL (by Vlad Losev).

scons/SConscript

@@ -292,6 +292,25 @@ if BUILD_TESTS:
   GtestBinary(env_without_rtti, 'gtest_no_rtti_test', gtest_main_no_rtti,
               ['../test/gtest_unittest.cc'])
 
+  # Tests that gtest works when built as a DLL on Windows.
+  # We don't need to actually run this test.
+  # Note: this is not supported under VC 7.1.
+  if env['PLATFORM'] == 'win32' and env.get('GTEST_BUILD_DLL_TEST', None):
+    test_env = EnvCreator.Create(env, EnvCreator.DllBuild)
+    dll_env = test_env.Clone()
+    dll_env.Append(LINKFLAGS=['-DEF:../src/gtest.def'])
+
+    gtest_dll = dll_env.SharedLibrary(
+                    target='gtest_dll',
+                    source=[dll_env.SharedObject('gtest_all_dll',
+                                                 '../src/gtest-all.cc'),
+                            dll_env.SharedObject('gtest_main_dll',
+                                                 '../src/gtest_main.cc')])
+    # TODO(vladl@google.com): Get rid of the .data[1] hack. Find a proper
+    # way to depend on a shared library without knowing its path in advance.
+    test_env.Program('gtest_dll_test_',
+                     ['../test/gtest_dll_test_.cc', gtest_dll.data[1]])
+
 ############################################################
 # Sample targets.
 

scons/SConscript.common

@@ -132,6 +132,24 @@ class EnvCreator:
       env.Append(CPPDEFINES='GTEST_HAS_RTTI=0')
   NoRtti = classmethod(NoRtti)
 
+  def DllBuild(cls, env):
+    """Enables building gtets as a DLL."""
+
+    env['OBJ_SUFFIX'] = '_dll'
+    # -MT(d) instructs MSVC to link to the static version of the C++
+    # runtime library; -MD(d) tells it to link to the DLL version.
+    flags = env['CCFLAGS']
+    if '-MTd' in flags:
+      flags.remove('-MTd')
+      flags.append('-MDd')
+    elif '-MT' in flags:
+      flags.remove('-MT')
+      flags.append('-MD')
+
+    # Disables the "non dll-interface class 'stdext::exception' used as
+    # base for dll-interface class" warning triggered by the STL code.
+    env.Append(CCFLAGS=['/wd4275'])
+  DllBuild = classmethod(DllBuild)
 
 sconscript_exports = {'EnvCreator': EnvCreator}
 Return('sconscript_exports')

scons/SConstruct

@@ -56,6 +56,8 @@ win_base = sconstruct_helper.MakeWinBaseEnvironment()
 # setting for our users.
 if win_base.get('MSVS_VERSION', None) == '7.1':
   sconstruct_helper.EnableExceptions(win_base)
+else:
+  win_base['GTEST_BUILD_DLL_TEST'] = True
 
 sconstruct_helper.MakeWinDebugEnvironment(win_base, 'win-dbg')
 sconstruct_helper.MakeWinOptimizedEnvironment(win_base, 'win-opt')