Use generate_isystem_symbols to ignore the symbols in -isystem headers (#402)

Co-authored-by: Tim Besard <tim.besard@gmail.com>

Author: Gnimuc

lib/13/libLLVM.jl

@@ -1,3 +1,6 @@
 [deps]
 Clang = "40e3b903-d033-50b4-a0cc-940c62c95e31"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
+
+[compat]
+Clang = "0.18.2"

lib/14/libLLVM.jl

@@ -4,6 +4,7 @@ prologue_file_path = ""
 epilogue_file_path = ""
 use_julia_native_enum_type = false
 use_deterministic_symbol = true
+generate_isystem_symbols = false
 printer_blacklist = [
     "LLVM_C_STRICT_PROTOTYPES_END",
     "LLVM_NATIVE_ARCH",

lib/15/libLLVM.jl

@@ -52,7 +52,7 @@ end
 function wrap(version; includedir, cppflags)
 
     args = get_default_args("x86_64-linux-gnu")
-    push!(args, "-Isystem$includedir")
+    push!(args, "-isystem$includedir")
     append!(args, split(cppflags))
 
     mkpath("../lib/$version")
@@ -82,22 +82,7 @@ function wrap(version; includedir, cppflags)
 
         ctx = create_context(header_files, args, options)
 
-        build!(ctx, BUILDSTAGE_NO_PRINTING)
-
-        # custom rewriter
-        function rewrite!(dag::ExprDAG)
-            replace!(get_nodes(dag)) do node
-                filename = normpath(Clang.get_filename(node.cursor))
-                if !contains(filename, "LLVMExtra")
-                    return ExprNode(node.id, Generators.Skip(), node.cursor, Expr[], node.adj)
-                end
-                return node
-            end
-        end
-
-        rewrite!(ctx.dag)
-
-        build!(ctx, BUILDSTAGE_PRINTING_ONLY)
+        build!(ctx)
     end
 
     return