Split into standard / standalone subspecs

The standard subspec is the default and behaves
as previously; the standalone subspec adds a
dependency to the sqlite3 pod which downloads and
compiles a version of SQLite instead of using the
system-supplied version.

The version of SQLite used can be further customized
by requiring another sqlite3 subspec from the main
Podfile.

Author: jberkel

SQLite.swift.podspec

@@ -24,19 +24,30 @@ Pod::Spec.new do |s|
   s.tvos.deployment_target = "9.0"
   s.osx.deployment_target = "10.9"
   s.watchos.deployment_target = "2.0"
+  s.default_subspec  = 'standard'
 
-  s.preserve_paths = 'CocoaPods/**/*'
-  s.pod_target_xcconfig = {
-    'SWIFT_INCLUDE_PATHS[sdk=macosx*]'           => '$(SRCROOT)/SQLite.swift/CocoaPods/macosx',
-    'SWIFT_INCLUDE_PATHS[sdk=iphoneos*]'         => '$(SRCROOT)/SQLite.swift/CocoaPods/iphoneos',
-    'SWIFT_INCLUDE_PATHS[sdk=iphonesimulator*]'  => '$(SRCROOT)/SQLite.swift/CocoaPods/iphonesimulator',
-    'SWIFT_INCLUDE_PATHS[sdk=appletvos*]'        => '$(SRCROOT)/SQLite.swift/CocoaPods/appletvos',
-    'SWIFT_INCLUDE_PATHS[sdk=appletvsimulator*]' => '$(SRCROOT)/SQLite.swift/CocoaPods/appletvsimulator',
-    'SWIFT_INCLUDE_PATHS[sdk=watchos*]'          => '$(SRCROOT)/SQLite.swift/CocoaPods/watchos',
-    'SWIFT_INCLUDE_PATHS[sdk=watchsimulator*]'   => '$(SRCROOT)/SQLite.swift/CocoaPods/watchsimulator'
-  }
-
-  s.libraries = 'sqlite3'
-  s.source_files = 'SQLite/**/*.{c,h,m,swift}'
-  s.private_header_files = 'SQLite/Core/fts3_tokenizer.h'
+  s.subspec 'standard' do |ss|
+    ss.source_files = 'SQLite/**/*.{c,h,m,swift}'
+    ss.private_header_files = 'SQLite/Core/fts3_tokenizer.h'
+
+    ss.library = 'sqlite3'
+    ss.preserve_paths = 'CocoaPods/**/*'
+    ss.pod_target_xcconfig = {
+      'SWIFT_INCLUDE_PATHS[sdk=macosx*]'           => '$(SRCROOT)/SQLite.swift/CocoaPods/macosx',
+      'SWIFT_INCLUDE_PATHS[sdk=iphoneos*]'         => '$(SRCROOT)/SQLite.swift/CocoaPods/iphoneos',
+      'SWIFT_INCLUDE_PATHS[sdk=iphonesimulator*]'  => '$(SRCROOT)/SQLite.swift/CocoaPods/iphonesimulator',
+      'SWIFT_INCLUDE_PATHS[sdk=appletvos*]'        => '$(SRCROOT)/SQLite.swift/CocoaPods/appletvos',
+      'SWIFT_INCLUDE_PATHS[sdk=appletvsimulator*]' => '$(SRCROOT)/SQLite.swift/CocoaPods/appletvsimulator',
+      'SWIFT_INCLUDE_PATHS[sdk=watchos*]'          => '$(SRCROOT)/SQLite.swift/CocoaPods/watchos',
+      'SWIFT_INCLUDE_PATHS[sdk=watchsimulator*]'   => '$(SRCROOT)/SQLite.swift/CocoaPods/watchsimulator'
+    }
+  end
+
+  s.subspec 'standalone' do |ss|
+    ss.source_files = 'SQLite/**/*.{c,h,m,swift}'
+    ss.private_header_files = 'SQLite/Core/fts3_tokenizer.h'
+    ss.xcconfig = { 'OTHER_SWIFT_FLAGS' => '$(inherited) -DSQLITE_SWIFT_STANDALONE' }
+
+    ss.dependency 'sqlite3'
+  end
 end

SQLite/Core/Connection.swift

@@ -23,7 +23,11 @@
 //
 
 import Dispatch
+#if SQLITE_SWIFT_STANDALONE
+import sqlite3
+#else
 import CSQLite
+#endif
 
 /// A connection to SQLite.
 public final class Connection {

SQLite/Core/Statement.swift

@@ -22,7 +22,11 @@
 // THE SOFTWARE.
 //
 
+#if SQLITE_SWIFT_STANDALONE
+import sqlite3
+#else
 import CSQLite
+#endif
 
 /// A single SQL statement.
 public final class Statement {

SQLite/Helpers.swift

@@ -22,7 +22,11 @@
 // THE SOFTWARE.
 //
 
+#if SQLITE_SWIFT_STANDALONE
+import sqlite3
+#else
 import CSQLite
+#endif
 
 public typealias Star = (Expression<Binding>?, Expression<Binding>?) -> Expression<Void>