Temporary header file '/tmp/yPwL25oEfZ/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#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/include/citygml/address.h"
  #include "/usr/include/citygml/appearance.h"
  #include "/usr/include/citygml/appearancetarget.h"
  #include "/usr/include/citygml/appearancetargetdefinition.h"
  #include "/usr/include/citygml/attributesmap.h"
  #include "/usr/include/citygml/citygml.h"
  #include "/usr/include/citygml/citygml_api.h"
  #include "/usr/include/citygml/citygml_export.h"
  #include "/usr/include/citygml/citygmlfactory.h"
  #include "/usr/include/citygml/citygmllogger.h"
  #include "/usr/include/citygml/citymodel.h"
  #include "/usr/include/citygml/cityobject.h"
  #include "/usr/include/citygml/enum_type_bitmask.h"
  #include "/usr/include/citygml/envelope.h"
  #include "/usr/include/citygml/externalreference.h"
  #include "/usr/include/citygml/featureobject.h"
  #include "/usr/include/citygml/geometry.h"
  #include "/usr/include/citygml/georeferencedtexture.h"
  #include "/usr/include/citygml/implictgeometry.h"
  #include "/usr/include/citygml/linearring.h"
  #include "/usr/include/citygml/linestring.h"
  #include "/usr/include/citygml/material.h"
  #include "/usr/include/citygml/materialtargetdefinition.h"
  #include "/usr/include/citygml/object.h"
  #include "/usr/include/citygml/polygon.h"
  #include "/usr/include/citygml/rectifiedgridcoverage.h"
  #include "/usr/include/citygml/tesselator.h"
  #include "/usr/include/citygml/texture.h"
  #include "/usr/include/citygml/texturecoordinates.h"
  #include "/usr/include/citygml/texturetargetdefinition.h"
  #include "/usr/include/citygml/transformmatrix.h"
  #include "/usr/include/citygml/vecs.hpp"

  // add namespaces
  namespace citygml{typedef int tmp_add_type_1;}
  citygml::tmp_add_type_1 tmp_add_func_1(){return 0;};

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/yPwL25oEfZ/dump1.h"

In file included from /tmp/yPwL25oEfZ/dump1.h:38:
/usr/include/citygml/tesselator.h:30:12: fatal error: GL/glu.h: No such file or directory
   30 |   #include <GL/glu.h>
      |            ^~~~~~~~~~
compilation terminated.