Temporary header file '/tmp/AVD6SQulbP/dump1.h' with the following content will be compiled to create GCC translation unit dump: // add defines #define __STDC_VERSION__ 201710L #define _TIME_BITS 64 #define _FILE_OFFSET_BITS 64 #define _GXX_NULLPTR_T #define CLUTTER_ENABLE_COMPOSITOR_API 1 #define _REGEX_NELTS(n) #define _Atomic #define PACKED typedef float _Float32; typedef long double _Float64; typedef double _Float32x; // add includes #include "/usr/include/gf_complete.h" #include "/usr/include/gf_general.h" #include "/usr/include/gf_method.h" #include "/usr/include/gf_rand.h" The GCC parameters: gcc -fdump-lang-raw -fkeep-inline-functions -c -U__cplusplus -D_Bool="bool" -fpreprocessed -x c++ -fpermissive -w "/tmp/AVD6SQulbP/dump1.i"