[Driver] Add driver support for Fuchsia

Provide toolchain and tool support for Fuchsia operating system.
Fuchsia uses compiler-rt as the runtime library and libc++, libc++abi
and libunwind as the C++ standard library. lld is used as a default
linker.

Differential Revision: https://reviews.llvm.org/D25117

llvm-svn: 283420

1 files changed, 26 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 39ac8be445d..12d92eef9f3 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -823,6 +823,28 @@ public:
   }
 };
 
+// Fuchsia Target
+template<typename Target>
+class FuchsiaTargetInfo : public OSTargetInfo<Target> {
+protected:
+  void getOSDefines(const LangOptions &Opts, const llvm::Triple &Triple,
+                    MacroBuilder &Builder) const override {
+    Builder.defineMacro("__Fuchsia__");
+    Builder.defineMacro("__ELF__");
+    if (Opts.POSIXThreads)
+      Builder.defineMacro("_REENTRANT");
+    // Required by the libc++ locale support.
+    if (Opts.CPlusPlus)
+      Builder.defineMacro("_GNU_SOURCE");
+  }
+public:
+  FuchsiaTargetInfo(const llvm::Triple &Triple,
+                    const TargetOptions &Opts)
+      : OSTargetInfo<Target>(Triple, Opts) {
+    this->MCountName = "__mcount";
+  }
+};
+
 // WebAssembly target
 template <typename Target>
 class WebAssemblyOSTargetInfo : public OSTargetInfo<Target> {
@@ -8271,6 +8293,8 @@ static TargetInfo *AllocateTarget(const llvm::Triple &Triple,
       return new LinuxTargetInfo<AArch64leTargetInfo>(Triple, Opts);
     case llvm::Triple::NetBSD:
       return new NetBSDTargetInfo<AArch64leTargetInfo>(Triple, Opts);
+    case llvm::Triple::Fuchsia:
+      return new FuchsiaTargetInfo<AArch64leTargetInfo>(Triple, Opts);
     default:
       return new AArch64leTargetInfo(Triple, Opts);
     }
@@ -8639,6 +8663,8 @@ static TargetInfo *AllocateTarget(const llvm::Triple &Triple,
       return new HaikuTargetInfo<X86_64TargetInfo>(Triple, Opts);
     case llvm::Triple::NaCl:
       return new NaClTargetInfo<X86_64TargetInfo>(Triple, Opts);
+    case llvm::Triple::Fuchsia:
+      return new FuchsiaTargetInfo<X86_64TargetInfo>(Triple, Opts);
     case llvm::Triple::PS4:
       return new PS4OSTargetInfo<X86_64TargetInfo>(Triple, Opts);
     default: