Temporary header file '/tmp/Hud7f5CK6S/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/tclcl/idlecallback.h"
  #include "/usr/include/tclcl/iohandler.h"
  #include "/usr/include/tclcl/rate-variable.h"
  #include "/usr/include/tclcl/tclcl-config.h"
  #include "/usr/include/tclcl/tclcl-internal.h"
  #include "/usr/include/tclcl/tclcl-mappings.h"
  #include "/usr/include/tclcl/tclcl.h"
  #include "/usr/include/tclcl/timer.h"
  #include "/usr/include/tclcl/tracedvar.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/Hud7f5CK6S/dump1.h"

In file included from /tmp/Hud7f5CK6S/dump1.h:12:
/usr/include/tclcl/idlecallback.h:41:10: fatal error: tcl.h: No such file or directory
   41 | #include <tcl.h>
      |          ^~~~~~~
compilation terminated.