[Driver] Support using toolchain libc and libc++ for baremetal (#96736)

We want to support using a complete Clang/LLVM toolchain that includes
LLVM libc and libc++ for baremetal targets. To do so, we need the driver
to add the necessary include paths.

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/lib/Driver/ToolChain.cpp b/clang/lib/Driver/ToolChain.cpp
index 8f4cc47..977e083 100644
--- a/clang/lib/Driver/ToolChain.cpp
+++ b/clang/lib/Driver/ToolChain.cpp
@@ -811,6 +811,12 @@ std::optional<std::string> ToolChain::getStdlibPath() const {
   return getTargetSubDirPath(P);
 }
 
+std::optional<std::string> ToolChain::getStdlibIncludePath() const {
+  SmallString<128> P(D.Dir);
+  llvm::sys::path::append(P, "..", "include");
+  return getTargetSubDirPath(P);
+}
+
 ToolChain::path_list ToolChain::getArchSpecificLibPaths() const {
   path_list Paths;