Temporary header file '/tmp/RXOuEc8Ssd/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/mrpt/expr/include/mrpt/3rdparty/exprtk.hpp"
  #include "/usr/include/mrpt/expr/include/mrpt/expr/CRuntimeCompiledExpression.h"
  #include "/usr/include/mrpt/expr/include/mrpt/expr/mrpt-expr_export.h"

  // add namespaces
  namespace exprtk{typedef int tmp_add_type_1;}
  exprtk::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace exprtk{namespace details{typedef int tmp_add_type_2;}}
  exprtk::details::tmp_add_type_2 tmp_add_func_2(){return 0;};
  namespace exprtk{namespace details{namespace numeric{typedef int tmp_add_type_3;}}}
  exprtk::details::numeric::tmp_add_type_3 tmp_add_func_3(){return 0;};
  namespace exprtk{namespace details{namespace numeric{namespace constant{typedef int tmp_add_type_4;}}}}
  exprtk::details::numeric::constant::tmp_add_type_4 tmp_add_func_4(){return 0;};
  namespace exprtk{namespace details{namespace numeric{namespace details{typedef int tmp_add_type_5;}}}}
  exprtk::details::numeric::details::tmp_add_type_5 tmp_add_func_5(){return 0;};
  namespace exprtk{namespace information{typedef int tmp_add_type_6;}}
  exprtk::information::tmp_add_type_6 tmp_add_func_6(){return 0;};
  namespace exprtk{namespace lexer{typedef int tmp_add_type_7;}}
  exprtk::lexer::tmp_add_type_7 tmp_add_func_7(){return 0;};
  namespace exprtk{namespace lexer{namespace helper{typedef int tmp_add_type_8;}}}
  exprtk::lexer::helper::tmp_add_type_8 tmp_add_func_8(){return 0;};
  namespace exprtk{namespace rtl{typedef int tmp_add_type_9;}}
  exprtk::rtl::tmp_add_type_9 tmp_add_func_9(){return 0;};
  namespace exprtk{namespace rtl{namespace io{typedef int tmp_add_type_10;}}}
  exprtk::rtl::io::tmp_add_type_10 tmp_add_func_10(){return 0;};
  namespace exprtk{namespace rtl{namespace io{namespace details{typedef int tmp_add_type_11;}}}}
  exprtk::rtl::io::details::tmp_add_type_11 tmp_add_func_11(){return 0;};
  namespace exprtk{namespace rtl{namespace io{namespace file{typedef int tmp_add_type_12;}}}}
  exprtk::rtl::io::file::tmp_add_type_12 tmp_add_func_12(){return 0;};
  namespace exprtk{namespace rtl{namespace io{namespace file{namespace details{typedef int tmp_add_type_13;}}}}}
  exprtk::rtl::io::file::details::tmp_add_type_13 tmp_add_func_13(){return 0;};
  namespace exprtk{namespace rtl{namespace vecops{typedef int tmp_add_type_14;}}}
  exprtk::rtl::vecops::tmp_add_type_14 tmp_add_func_14(){return 0;};
  namespace exprtk{namespace rtl{namespace vecops{namespace details{typedef int tmp_add_type_15;}}}}
  exprtk::rtl::vecops::details::tmp_add_type_15 tmp_add_func_15(){return 0;};
  namespace exprtk{namespace rtl{namespace vecops{namespace helper{typedef int tmp_add_type_16;}}}}
  exprtk::rtl::vecops::helper::tmp_add_type_16 tmp_add_func_16(){return 0;};
  namespace mrpt{typedef int tmp_add_type_17;}
  mrpt::tmp_add_type_17 tmp_add_func_17(){return 0;};
  namespace mrpt{namespace expr{typedef int tmp_add_type_18;}}
  mrpt::expr::tmp_add_type_18 tmp_add_func_18(){return 0;};
  namespace spimpl{typedef int tmp_add_type_19;}
  spimpl::tmp_add_type_19 tmp_add_func_19(){return 0;};
  namespace spimpl{namespace details{typedef int tmp_add_type_20;}}
  spimpl::details::tmp_add_type_20 tmp_add_func_20(){return 0;};
  namespace exprtk{namespace details{namespace loop_unroll{typedef int tmp_add_type_21;}}}
  exprtk::details::loop_unroll::tmp_add_type_21 tmp_add_func_21(){return 0;};
  namespace exprtk{namespace parser_error{typedef int tmp_add_type_22;}}
  exprtk::parser_error::tmp_add_type_22 tmp_add_func_22(){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;
  itimerval* tmp_add_class_3;

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/RXOuEc8Ssd/dump1.h"  -I/usr/include/mrpt/core/include