================
@@ -456,21 +492,15 @@ ifeq (1, $(USE_SYSTEM_STDLIB))
         endif
         CXXFLAGS += -nostdlib++ -nostdinc++ -cxx-isystem 
$(SDKROOT)/usr/include/c++/v1
         LDFLAGS += -L$(SDKROOT)/usr/lib -Wl,-rpath,$(SDKROOT)/usr/lib -lc++
+    else
+        ifneq (,$(findstring clang,$(CC)))
+            # Force clang looking for the gcc's headers at specific rootfs 
folder.
+            CXXFLAGS += -stdlib=libstdc++ $(GCC_TOOLCHAIN_FLAGS)
----------------
dzhidzhoev wrote:

> This still forces the usage of libstdc++ on windows, right? Could we just 
> pass nothing here and let clang use its default?

Sorry, that was too early. 
We still need this flag. It is ignored for Windows target, but clang tries to 
pass -lc++ to linker in case of Linux target if -lstdc++ is not specified, and 
ld.lld fails to find it (since it's not present in my sysroot).

https://github.com/llvm/llvm-project/pull/99266
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