Temporary header file '/tmp/SK9y5gKlCB/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/kopeninghours/display.h"
  #include "/usr/include/kopeninghours/interval.h"
  #include "/usr/include/kopeninghours/intervalmodel.h"
  #include "/usr/include/kopeninghours/kopeninghours_export.h"
  #include "/usr/include/kopeninghours/openinghours.h"
  #include "/usr/include/kopeninghours_version.h"

  // add namespaces
  namespace KOpeningHours{typedef int tmp_add_type_1;}
  KOpeningHours::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace KOpeningHours{namespace Display{typedef int tmp_add_type_2;}}
  KOpeningHours::Display::tmp_add_type_2 tmp_add_func_2(){return 0;};

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/SK9y5gKlCB/dump1.h"

In file included from /tmp/SK9y5gKlCB/dump1.h:13:
/usr/include/kopeninghours/interval.h:12:10: fatal error: QDateTime: No such file or directory
   12 | #include <QDateTime>
      |          ^~~~~~~~~~~
compilation terminated.