[PATCH] Fix driver-related things for FreeBSD

[Viktor Kutuzov]

Hi kcc, samsonov, cpirker, compnerd, dexonsmith, theraven,

This patch adds libcxxrt when clang is invoked with -stdlib=libc++ on FreeBSD (which is necessary to build llvm against libc++ on FreeBSD 9.2). It also adds the default path to the libc++ headers (which is /usr/local/include/c++/v1 and not /usr/include/c++/v1 as clang currently expect). Furthermore, it fixes the path to the clang's headers (which is /usr/include/clang/X.Y.Z and not <resource-dir>/include).

http://reviews.llvm.org/D3381

Files:
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  lib/Frontend/InitHeaderSearch.cpp

Index: lib/Driver/ToolChains.cpp
===================================================================
--- lib/Driver/ToolChains.cpp
+++ lib/Driver/ToolChains.cpp
@@ -2490,6 +2490,9 @@
   case ToolChain::CST_Libcxx:
     addSystemInclude(DriverArgs, CC1Args,
                      getDriver().SysRoot + "/usr/include/c++/v1");
+    // The libc++ port installs headers to /usr/local by default.
+    addSystemInclude(DriverArgs, CC1Args,
+                     getDriver().SysRoot + "/usr/local/include/c++/v1");
     break;
   case ToolChain::CST_Libstdcxx:
     addSystemInclude(DriverArgs, CC1Args,
@@ -2530,6 +2533,19 @@
   return getSanitizerArgs().hasZeroBaseShadow();
 }
 
+void FreeBSD::AddCXXStdlibLibArgs(const ArgList &Args,
+                                 ArgStringList &CmdArgs) const {
+  switch (GetCXXStdlibType(Args)) {
+  case ToolChain::CST_Libcxx:
+    CmdArgs.push_back("-lc++");
+    CmdArgs.push_back("-lcxxrt");
+    break;
+  case ToolChain::CST_Libstdcxx:
+    CmdArgs.push_back("-lstdc++");
+    break;
+  }
+}
+
 /// NetBSD - NetBSD tool chain which can call as(1) and ld(1) directly.
 
 NetBSD::NetBSD(const Driver &D, const llvm::Triple& Triple, const ArgList &Args)
Index: lib/Driver/ToolChains.h
===================================================================
--- lib/Driver/ToolChains.h
+++ lib/Driver/ToolChains.h
@@ -584,6 +584,8 @@
   void
   AddClangCXXStdlibIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                                llvm::opt::ArgStringList &CC1Args) const override;
+  void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
+                           llvm::opt::ArgStringList &CmdArgs) const override;
   bool IsIntegratedAssemblerDefault() const override {
     if (getTriple().getArch() == llvm::Triple::ppc ||
         getTriple().getArch() == llvm::Triple::ppc64)
Index: lib/Frontend/InitHeaderSearch.cpp
===================================================================
--- lib/Frontend/InitHeaderSearch.cpp
+++ lib/Frontend/InitHeaderSearch.cpp
@@ -14,6 +14,7 @@
 #include "clang/Frontend/Utils.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/LangOptions.h"
+#include "clang/Basic/Version.h"
 #include "clang/Config/config.h" // C_INCLUDE_DIRS
 #include "clang/Lex/HeaderSearch.h"
 #include "clang/Lex/HeaderSearchOptions.h"
@@ -242,11 +243,16 @@
   // Builtin includes use #include_next directives and should be positioned
   // just prior C include dirs.
   if (HSOpts.UseBuiltinIncludes) {
-    // Ignore the sys root, we *always* look for clang headers relative to
-    // supplied path.
-    SmallString<128> P = StringRef(HSOpts.ResourceDir);
-    llvm::sys::path::append(P, "include");
-    AddUnmappedPath(P.str(), ExternCSystem, false);
+    // On FreeBSD the include path is not resource-dir-relative.
+    if (os == llvm::Triple::FreeBSD) {
+      AddPath("/usr/include/clang/" CLANG_VERSION_STRING, ExternCSystem, false);
+    } else {
+      // Ignore the sys root, we *always* look for clang headers relative to
+      // supplied path.
+      SmallString<128> P = StringRef(HSOpts.ResourceDir);
+      llvm::sys::path::append(P, "include");
+      AddUnmappedPath(P.str(), ExternCSystem, false);
+    }
   }
 
   // All remaining additions are for system include directories, early exit if
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