SERVER-18569 Standalone ASIO build system integration

Author: acmorrow

SConstruct

@@ -291,6 +291,8 @@ add_option( "use-system-stemmer", "use system version of stemmer", 0, True )
 
 add_option( "use-system-yaml", "use system version of yaml", 0, True )
 
+add_option( "use-system-asio", "use system version of ASIO", 0, True )
+
 add_option( "use-system-all" , "use all system libraries", 0 , True )
 
 # deprecated

src/third_party/SConscript

@@ -51,6 +51,10 @@ if not use_system_version_of_library('yaml'):
     thirdPartyIncludePathList.append(
         ('yaml', '#/src/third_party/yaml-cpp-0.5.1/include'))
 
+if not use_system_version_of_library('asio'):
+    thirdPartyIncludePathList.append(
+        ('asio', '#/src/third_party/asio-asio-1-11-0/asio/include'))
+
 def injectAllThirdPartyIncludePaths(thisEnv):
     thisEnv.AppendUnique(CPPPATH=[entry[1] for entry in thirdPartyIncludePathList])
 
@@ -295,3 +299,22 @@ if wiredtiger:
             'shim_wiredtiger.cpp'
         ])
 
+if use_system_version_of_library("asio"):
+    asioEnv = env.Clone(
+        SYSLIBDEPS=[
+            env['LIBDEPS_ASIO_SYSLIBDEP'],
+        ])
+else:
+    asioEnv = env.Clone()
+    asioEnv.InjectThirdPartyIncludePaths(libraries=['asio'])
+    asioEnv.SConscript('asio-asio-1-11-0/SConscript', exports={ 'env' : asioEnv })
+    asioEnv = asioEnv.Clone(
+        LIBDEPS=[
+            'asio-asio-1-11-0/asio',
+        ])
+
+asioEnv.Library(
+    target="shim_asio",
+    source=[
+        'shim_asio.cpp'
+    ])

src/third_party/asio-asio-1-11-0/SConscript

@@ -0,0 +1,8 @@
+Import("env")
+
+env.Library(
+    target="asio",
+    source=[
+        "asio/src/asio.cpp",
+    ]
+)

src/third_party/asio-asio-1-11-0/asio/include/asio/detail/config.hpp

@@ -11,6 +11,11 @@
 #ifndef ASIO_DETAIL_CONFIG_HPP
 #define ASIO_DETAIL_CONFIG_HPP
 
+// MongoDB modification. We want this standalone, and we want separate
+// compilation for what we can to cut down on compile times.
+# define ASIO_STANDALONE // MongoDB
+# define ASIO_SEPARATE_COMPILATION // MongoDB
+
 #if defined(ASIO_STANDALONE)
 # define ASIO_DISABLE_BOOST_ARRAY 1
 # define ASIO_DISABLE_BOOST_ASSERT 1

src/third_party/shim_asio.cpp

@@ -0,0 +1,3 @@
+// This file intentionally blank.  shim_asio.cpp is part of the
+// third_party/asio library, which is just a placeholder for forwarding
+// library dependencies.