Temporary header file '/tmp/bwsZNQCNW0/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/include/LBFGS.h"
  #include "/usr/include/LBFGSB.h"
  #include "/usr/include/LBFGSpp/BFGSMat.h"
  #include "/usr/include/LBFGSpp/BKLDLT.h"
  #include "/usr/include/LBFGSpp/Cauchy.h"
  #include "/usr/include/LBFGSpp/LineSearchBacktracking.h"
  #include "/usr/include/LBFGSpp/LineSearchBracketing.h"
  #include "/usr/include/LBFGSpp/LineSearchMoreThuente.h"
  #include "/usr/include/LBFGSpp/LineSearchNocedalWright.h"
  #include "/usr/include/LBFGSpp/Param.h"
  #include "/usr/include/LBFGSpp/SubspaceMin.h"

  // add namespaces
  namespace Eigen{typedef int tmp_add_type_1;}
  Eigen::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace Eigen{namespace Architecture{typedef int tmp_add_type_2;}}
  Eigen::Architecture::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace Eigen{namespace indexing{typedef int tmp_add_type_3;}}
  Eigen::indexing::tmp_add_type_3 tmp_add_func_3(){return 0;};
  namespace Eigen{namespace internal{typedef int tmp_add_type_4;}}
  Eigen::internal::tmp_add_type_4 tmp_add_func_4(){return 0;};
  namespace Eigen{namespace numext{typedef int tmp_add_type_5;}}
  Eigen::numext::tmp_add_type_5 tmp_add_func_5(){return 0;};
  namespace Eigen{namespace placeholders{typedef int tmp_add_type_6;}}
  Eigen::placeholders::tmp_add_type_6 tmp_add_func_6(){return 0;};
  namespace Eigen{namespace symbolic{typedef int tmp_add_type_7;}}
  Eigen::symbolic::tmp_add_type_7 tmp_add_func_7(){return 0;};
  namespace LBFGSpp{typedef int tmp_add_type_8;}
  LBFGSpp::tmp_add_type_8 tmp_add_func_8(){return 0;};
  namespace Eigen{namespace bfloat16_impl{typedef int tmp_add_type_9;}}
  Eigen::bfloat16_impl::tmp_add_type_9 tmp_add_func_9(){return 0;};
  namespace Eigen{namespace half_impl{typedef int tmp_add_type_10;}}
  Eigen::half_impl::tmp_add_type_10 tmp_add_func_10(){return 0;};
  namespace Eigen{namespace internal{namespace std_fallback{typedef int tmp_add_type_11;}}}
  Eigen::internal::std_fallback::tmp_add_type_11 tmp_add_func_11(){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/bwsZNQCNW0/dump1.h"  -I/usr/include/eigen3 -I/usr/include/eigen3/Eigen/src/Core/arch/HIP/hcc

