Temporary header file '/tmp/nekp9YFYlu/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/publib/alloc.h"
  #include "/usr/include/publib/base64.h"
  #include "/usr/include/publib/bitarr.h"
  #include "/usr/include/publib/cmp.h"
  #include "/usr/include/publib/errormsg.h"
  #include "/usr/include/publib/files.h"
  #include "/usr/include/publib/fname.h"
  #include "/usr/include/publib/hash.h"
  #include "/usr/include/publib/iset.h"
  #include "/usr/include/publib/lockfile.h"
  #include "/usr/include/publib/log.h"
  #include "/usr/include/publib/main.h"
  #include "/usr/include/publib/nntp.h"
  #include "/usr/include/publib/priq.h"
  #include "/usr/include/publib/queue.h"
  #include "/usr/include/publib/sbuf.h"
  #include "/usr/include/publib/stack.h"
  #include "/usr/include/publib/strutil.h"
  #include "/usr/include/publib/tbuf.h"
  #include "/usr/include/publib.h"

  // 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;
  dynarr* tmp_add_class_3;
  nntp_article* tmp_add_class_4;
  tbuf_stat* tmp_add_class_5;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/nekp9YFYlu/dump1.h"

In file included from /usr/include/publib.h:43,
                 from /tmp/nekp9YFYlu/dump1.h:31:
/usr/include/publib/lockfile.h:37:5: error: conflicting declaration of ‘int lockfile_create(const char*)’ with ‘C’ linkage
   37 | int lockfile_create(const char *);
      |     ^~~~~~~~~~~~~~~
In file included from /tmp/nekp9YFYlu/dump1.h:21:
/usr/include/publib/lockfile.h:37:5: note: previous declaration with ‘C++’ linkage
   37 | int lockfile_create(const char *);
      |     ^~~~~~~~~~~~~~~
/usr/include/publib/lockfile.h:38:5: error: conflicting declaration of ‘int lockfile_remove(const char*)’ with ‘C’ linkage
   38 | int lockfile_remove(const char *);
      |     ^~~~~~~~~~~~~~~
/usr/include/publib/lockfile.h:38:5: note: previous declaration with ‘C++’ linkage
   38 | int lockfile_remove(const char *);
      |     ^~~~~~~~~~~~~~~