Add Hurd target to Clang driver (2/2)

This adds Hurd toolchain support to Clang's driver in addition
to handling translating the triple from Hurd-compatible form to
the actual triple registered in LLVM.

(Phabricator was stripping the empty files from the patch so I 
manually created them)

Patch by sthibaul (Samuel Thibault)

Differential Revision: https://reviews.llvm.org/D54379

llvm-svn: 347833

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 41c1da333ff..3df887017d4 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -26,6 +26,7 @@
 #include "ToolChains/HIP.h"
 #include "ToolChains/Haiku.h"
 #include "ToolChains/Hexagon.h"
+#include "ToolChains/Hurd.h"
 #include "ToolChains/Lanai.h"
 #include "ToolChains/Linux.h"
 #include "ToolChains/MSVC.h"
@@ -402,6 +403,13 @@ static llvm::Triple computeTargetTriple(const Driver &D,
 
   llvm::Triple Target(llvm::Triple::normalize(TargetTriple));
 
+  // GNU/Hurd's triples should have been -hurd-gnu*, but were historically made
+  // -gnu* only, and we can not change this, so we have to detect that case as
+  // being the Hurd OS.
+  if (TargetTriple.find("-unknown-gnu") != StringRef::npos ||
+      TargetTriple.find("-pc-gnu") != StringRef::npos)
+    Target.setOSName("hurd");
+
   // Handle Apple-specific options available here.
   if (Target.isOSBinFormatMachO()) {
     // If an explicit Darwin arch name is given, that trumps all.
@@ -4574,6 +4582,9 @@ const ToolChain &Driver::getToolChain(const ArgList &Args,
     case llvm::Triple::Contiki:
       TC = llvm::make_unique<toolchains::Contiki>(*this, Target, Args);
       break;
+    case llvm::Triple::Hurd:
+      TC = llvm::make_unique<toolchains::Hurd>(*this, Target, Args);
+      break;
     default:
       // Of these targets, Hexagon is the only one that might have
       // an OS of Linux, in which case it got handled above already.