[Xtensa] Fix Clang builtins include directory (LLVM-293) #84
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This fixes #83.
In short, it adjusts the include path logic to include the builtins directory as long as
-nostdinc
or-nobuiltininc
isn't specified.Previously, the builtins directory would not be included if either the GCC installation wasn't found, or
-nostdlibinc
was specified (both of which aren't related to the builtins directory).I've tested this patch on TinyGo, but didn't test it otherwise.