Disable Linux support in Apple B&I builds

Swift SVN r25633

CMakeLists.txt

@@ -52,6 +52,10 @@ option(SWIFT_INCLUDE_DOCS
     "Create targets for building docs."
     TRUE)
 
+option(SWIFT_ENABLE_TARGET_LINUX
+    "Enable compiler support for targeting Linux"
+    TRUE)
+
 set(SWIFT_VERSION "1.2" CACHE STRING
     "The user-visible version of the Swift compiler")
 set(SWIFT_VENDOR "" CACHE STRING

lib/Driver/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_swift_library(swiftDriver
+set(swiftDriver_sources
   Action.cpp
   Compilation.cpp
   DependencyGraph.cpp
@@ -13,5 +13,16 @@ add_swift_library(swiftDriver
   ToolChains.cpp
   Types.cpp
   Util.cpp
+  )
+
+add_swift_library(swiftDriver
+  ${swiftDriver_sources}
   DEPENDS SwiftOptions
   LINK_LIBRARIES swiftAST swiftBasic swiftFrontend swiftOption)
+
+if(${SWIFT_ENABLE_TARGET_LINUX})
+  foreach(f ${swiftDriver_sources})
+    set_property(SOURCE ${f} APPEND_STRING PROPERTY COMPILE_FLAGS
+        " -DSWIFT_ENABLE_TARGET_LINUX=\"1\"")
+  endforeach()
+endif()

lib/Driver/Driver.cpp

@@ -1849,9 +1849,11 @@ const ToolChain *Driver::getToolChain(const ArgList &Args,
     case llvm::Triple::IOS:
       TC = new toolchains::Darwin(*this, Target);
       break;
+#if defined(SWIFT_ENABLE_TARGET_LINUX)
     case llvm::Triple::Linux:
       TC = new toolchains::Linux(*this, Target);
       break;
+#endif // SWIFT_ENABLE_TARGET_LINUX
     default:
       TC = nullptr;
     }

lib/Driver/ToolChains.cpp

@@ -29,8 +29,12 @@ StringRef Darwin::getDarwinArchName(const ArgList &Args) const {
   return getArchName();
 }
 
+#if defined(SWIFT_ENABLE_TARGET_LINUX)
+
 /// Linux
 
 std::unique_ptr<Tool> Linux::buildLinker() const {
   return std::unique_ptr<Tool>(new tools::linux::Linker(*this));
 }
+
+#endif // SWIFT_ENABLE_TARGET_LINUX

lib/Driver/ToolChains.h

@@ -34,6 +34,8 @@ public:
   StringRef getDarwinArchName(const llvm::opt::ArgList &Args) const;
 };
 
+#if defined(SWIFT_ENABLE_TARGET_LINUX)
+
 class LLVM_LIBRARY_VISIBILITY Linux : public ToolChain {
 protected:
   virtual std::unique_ptr<Tool> buildLinker() const;
@@ -42,6 +44,8 @@ public:
   ~Linux() = default;
 };
 
+#endif // SWIFT_ENABLE_TARGET_LINUX
+
 } // end namespace toolchains
 } // end namespace driver
 } // end namespace swift

lib/Driver/Tools.cpp

@@ -687,6 +687,8 @@ Job *darwin::Linker::constructJob(const JobAction &JA,
                  Arguments);
 }
 
+#if defined(SWIFT_ENABLE_TARGET_LINUX)
+
 /// Linux Tools
 
 Job *linux::Linker::constructJob(const JobAction &JA,
@@ -787,3 +789,6 @@ Job *linux::Linker::constructJob(const JobAction &JA,
   return new Job(JA, *this, std::move(Inputs), std::move(Output),
                  Args.MakeArgString(Exec), Arguments);
 }
+
+#endif // SWIFT_ENABLE_TARGET_LINUX
+