Temporary header file '/tmp/oUTvtonubf/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _FILE_OFFSET_BITS 64
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/ADT/Hashing.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/ADT/None.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/ADT/Optional.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/ADT/STLExtras.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/ADT/STLForwardCompat.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/ADT/SmallVector.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/ADT/StringRef.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/ADT/StringSwitch.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/ADT/iterator.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/ADT/iterator_range.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/Config/abi-breaking.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/Config/llvm-config.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/Support/Casting.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/Support/Compiler.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/Support/DataTypes.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/Support/ErrorHandling.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/Support/MemAlloc.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/Support/SwapByteOrder.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/Support/raw_ostream.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm/Support/type_traits.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/llvm-c/DataTypes.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/AST/Ownership.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Basic/Compiler.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Basic/InlineBitfield.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Basic/LLVM.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Basic/STLExtras.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Demangling/Demangle.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Demangling/Demangler.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Demangling/ManglingMacros.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Demangling/ManglingUtils.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Demangling/NamespaceMacros.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Demangling/Punycode.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Runtime/BackDeployment.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Runtime/CMakeConfig.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Runtime/Config.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include/swift/Strings.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/lib/Demangling/RemanglerBase.h"
  #include "/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/stdlib/public/SwiftShims/Visibility.h"

  // add namespaces
  namespace llvm{typedef int tmp_add_type_1;}
  llvm::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace llvm{namespace detail{typedef int tmp_add_type_2;}}
  llvm::detail::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace llvm{namespace hashing{typedef int tmp_add_type_3;}}
  llvm::hashing::tmp_add_type_3 tmp_add_func_3(){return 0;};
  namespace llvm{namespace hashing{namespace detail{typedef int tmp_add_type_4;}}}
  llvm::hashing::detail::tmp_add_type_4 tmp_add_func_4(){return 0;};
  namespace llvm{namespace sys{typedef int tmp_add_type_5;}}
  llvm::sys::tmp_add_type_5 tmp_add_func_5(){return 0;};
  namespace llvm{namespace sys{namespace fs{typedef int tmp_add_type_6;}}}
  llvm::sys::fs::tmp_add_type_6 tmp_add_func_6(){return 0;};
  namespace swift{typedef int tmp_add_type_7;}
  swift::tmp_add_type_7 tmp_add_func_7(){return 0;};
  namespace swift{namespace Demangle{typedef int tmp_add_type_8;}}
  swift::Demangle::tmp_add_type_8 tmp_add_func_8(){return 0;};
  namespace swift{namespace detail{typedef int tmp_add_type_9;}}
  swift::detail::tmp_add_type_9 tmp_add_func_9(){return 0;};
  namespace swift{namespace Mangle{typedef int tmp_add_type_10;}}
  swift::Mangle::tmp_add_type_10 tmp_add_func_10(){return 0;};
  namespace swift{namespace Punycode{typedef int tmp_add_type_11;}}
  swift::Punycode::tmp_add_type_11 tmp_add_func_11(){return 0;};
  namespace llvm{namespace adl_detail{typedef int tmp_add_type_12;}}
  llvm::adl_detail::tmp_add_type_12 tmp_add_func_12(){return 0;};
  namespace llvm{namespace optional_detail{typedef int tmp_add_type_13;}}
  llvm::optional_detail::tmp_add_type_13 tmp_add_func_13(){return 0;};

  // add classes
  _G_fpos64_t* tmp_add_class_0;
  _G_fpos_t* tmp_add_class_1;
  _IO_cookie_io_functions_t* tmp_add_class_2;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/oUTvtonubf/dump1.h"  -I/usr/share/cargo/registry/symbolic-demangle-9.2.1/vendor/swift/include