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Index: llvm-toolchain-snapshot_21~++20250607105253+432c5f2c608d/clang/lib/Driver/ToolChains/Linux.cpp
===================================================================
--- llvm-toolchain-snapshot_21~++20250607105253+432c5f2c608d.orig/clang/lib/Driver/ToolChains/Linux.cpp
+++ llvm-toolchain-snapshot_21~++20250607105253+432c5f2c608d/clang/lib/Driver/ToolChains/Linux.cpp
@@ -12,6 +12,7 @@
#include "Arch/Mips.h"
#include "Arch/PPC.h"
#include "Arch/RISCV.h"
+#include "clang/Basic/Version.h"
#include "clang/Config/config.h"
#include "clang/Driver/CommonArgs.h"
#include "clang/Driver/Distro.h"
@@ -639,8 +640,18 @@ void Linux::AddClangSystemIncludeArgs(co
SmallString<128> ResourceDirInclude(D.ResourceDir);
llvm::sys::path::append(ResourceDirInclude, "include");
if (!DriverArgs.hasArg(options::OPT_nobuiltininc) &&
- (!getTriple().isMusl() || DriverArgs.hasArg(options::OPT_nostdlibinc)))
- addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude);
+ (!getTriple().isMusl() || DriverArgs.hasArg(options::OPT_nostdlibinc))) {
+ if (llvm::sys::fs::exists(ResourceDirInclude)) {
+ /* Include the build include directory only
+ * Otherwise, it fails with stage2 when clang headers are available on the system
+ * they usually fail because of the include_next. Two llvm/clang headers are found
+ * while we are waiting for the lib C++ (std or not)
+ */
+ addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude);
+ } else {
+ addSystemInclude(DriverArgs, CC1Args, "/usr/include/clang/" + std::string(CLANG_VERSION_STRING) + "/include/");
+ }
+ }
if (DriverArgs.hasArg(options::OPT_nostdlibinc))
return;
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