[GN]: Support for loadable modules

tools/gn/toolchain.cc

Index: tools/gn/toolchain.cc
diff --git a/tools/gn/toolchain.cc b/tools/gn/toolchain.cc
index cdd70c02f5546740fdf6adb3c4bd0929f21090ea..933412d5ad0b4551f11a3978bd3cf7409012ec47 100644
--- a/tools/gn/toolchain.cc
+++ b/tools/gn/toolchain.cc
@@ -17,6 +17,7 @@ const char* Toolchain::kToolObjCxx = "objcxx";
 const char* Toolchain::kToolRc = "rc";
 const char* Toolchain::kToolAsm = "asm";
 const char* Toolchain::kToolAlink = "alink";
+const char* Toolchain::kToolDylink = "dylink";
 const char* Toolchain::kToolSolink = "solink";
 const char* Toolchain::kToolLink = "link";
 const char* Toolchain::kToolStamp = "stamp";
@@ -48,6 +49,7 @@ Toolchain::ToolType Toolchain::ToolNameToType(const base::StringPiece& str) {
   if (str == kToolRc) return TYPE_RC;
   if (str == kToolAsm) return TYPE_ASM;
   if (str == kToolAlink) return TYPE_ALINK;
+  if (str == kToolDylink) return TYPE_DYLINK;
   if (str == kToolSolink) return TYPE_SOLINK;
   if (str == kToolLink) return TYPE_LINK;
   if (str == kToolStamp) return TYPE_STAMP;
@@ -65,6 +67,7 @@ std::string Toolchain::ToolTypeToName(ToolType type) {
     case TYPE_RC: return kToolRc;
     case TYPE_ASM: return kToolAsm;
     case TYPE_ALINK: return kToolAlink;
+    case TYPE_DYLINK: return kToolDylink;
     case TYPE_SOLINK: return kToolSolink;
     case TYPE_LINK: return kToolLink;
     case TYPE_STAMP: return kToolStamp;
@@ -139,6 +142,11 @@ Toolchain::ToolType Toolchain::GetToolTypeForTargetFinalOutput(
     case Target::EXECUTABLE:
       return Toolchain::TYPE_LINK;
     case Target::SHARED_LIBRARY:
+      // TODO(andybons): Uncomment on the next roll, which must include the
+      // BUILD file changes.
+      //if (target->loadable_module())
+      //  return Toolchain::TYPE_SOLINK;
+      //return Toolchain::TYPE_DYLINK;
       return Toolchain::TYPE_SOLINK;
     case Target::STATIC_LIBRARY:
       return Toolchain::TYPE_ALINK;