[runtimes] Move libunwind, libc++abi and libc++ to lib/$target/c++ and include/c++

This change is a consequence of the discussion in "RFC: Place libs in
Clang-dedicated directories", specifically the suggestion that
libunwind, libc++abi and libc++ shouldn't be using Clang resource
directory. Tools like clangd make this assumption, but this is
currently not true for the LLVM_ENABLE_PER_TARGET_RUNTIME_DIR build.
This change addresses that by moving the output of these libraries to
lib/$target/c++ and include/c++ directories, leaving resource directory
only for compiler-rt runtimes and Clang builtin headers.

Differential Revision: https://reviews.llvm.org/D59168

llvm-svn: 361432

3 files changed, 9 insertions, 3 deletions

diff --git a/clang/lib/Driver/ToolChain.cpp b/clang/lib/Driver/ToolChain.cpp
index dbb347c8bc8..3b0e8f2dbaa 100644
--- a/clang/lib/Driver/ToolChain.cpp
+++ b/clang/lib/Driver/ToolChain.cpp
@@ -75,6 +75,13 @@ ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,
       CachedRTTIMode(CalculateRTTIMode(Args, Triple, CachedRTTIArg)) {
   SmallString<128> P;
 
+  if (D.CCCIsCXX()) {
+    P.assign(D.Dir);
+    llvm::sys::path::append(P, "..", "lib", D.getTargetTriple(), "c++");
+    if (getVFS().exists(P))
+      getLibraryPaths().push_back(P.str());
+  }
+
   P.assign(D.ResourceDir);
   llvm::sys::path::append(P, D.getTargetTriple(), "lib");
   if (getVFS().exists(P))
diff --git a/clang/lib/Driver/ToolChains/Fuchsia.cpp b/clang/lib/Driver/ToolChains/Fuchsia.cpp
index c906379f19b..3249d4f1f7f 100644
--- a/clang/lib/Driver/ToolChains/Fuchsia.cpp
+++ b/clang/lib/Driver/ToolChains/Fuchsia.cpp
@@ -305,8 +305,8 @@ void Fuchsia::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
 
   switch (GetCXXStdlibType(DriverArgs)) {
   case ToolChain::CST_Libcxx: {
-    SmallString<128> P(getDriver().ResourceDir);
-    llvm::sys::path::append(P, "include", "c++", "v1");
+    SmallString<128> P(getDriver().Dir);
+    llvm::sys::path::append(P, "..", "include", "c++", "v1");
     addSystemInclude(DriverArgs, CC1Args, P.str());
     break;
   }
diff --git a/clang/lib/Driver/ToolChains/Linux.cpp b/clang/lib/Driver/ToolChains/Linux.cpp
index 4890ef45753..7168b7f1192 100644
--- a/clang/lib/Driver/ToolChains/Linux.cpp
+++ b/clang/lib/Driver/ToolChains/Linux.cpp
@@ -889,7 +889,6 @@ void Linux::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
                                   llvm::opt::ArgStringList &CC1Args) const {
   const std::string& SysRoot = computeSysRoot();
   const std::string LibCXXIncludePathCandidates[] = {
-      DetectLibcxxIncludePath(getDriver().ResourceDir + "/include/c++"),
       DetectLibcxxIncludePath(getDriver().Dir + "/../include/c++"),
       // If this is a development, non-installed, clang, libcxx will
       // not be found at ../include/c++ but it likely to be found at