Temporary header file '/tmp/dxhBxjDoZS/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/TooN/Cholesky.h"
  #include "/usr/include/TooN/GR_SVD.h"
  #include "/usr/include/TooN/LU.h"
  #include "/usr/include/TooN/Lapack_Cholesky.h"
  #include "/usr/include/TooN/QR.h"
  #include "/usr/include/TooN/QR_Lapack.h"
  #include "/usr/include/TooN/SVD.h"
  #include "/usr/include/TooN/SymEigen.h"
  #include "/usr/include/TooN/TooN.h"
  #include "/usr/include/TooN/determinant.h"
  #include "/usr/include/TooN/functions/derivatives.h"
  #include "/usr/include/TooN/functions/fadbad.h"
  #include "/usr/include/TooN/gauss_jordan.h"
  #include "/usr/include/TooN/gaussian_elimination.h"
  #include "/usr/include/TooN/generated.h"
  #include "/usr/include/TooN/helpers.h"
  #include "/usr/include/TooN/internal/diagmatrix.h"
  #include "/usr/include/TooN/internal/objects.h"
  #include "/usr/include/TooN/irls.h"
  #include "/usr/include/TooN/lapack.h"
  #include "/usr/include/TooN/named_elements.h"
  #include "/usr/include/TooN/optimization/brent.h"
  #include "/usr/include/TooN/optimization/conjugate_gradient.h"
  #include "/usr/include/TooN/optimization/downhill_simplex.h"
  #include "/usr/include/TooN/optimization/golden_section.h"
  #include "/usr/include/TooN/se2.h"
  #include "/usr/include/TooN/se3.h"
  #include "/usr/include/TooN/sim2.h"
  #include "/usr/include/TooN/sim3.h"
  #include "/usr/include/TooN/sl.h"
  #include "/usr/include/TooN/so2.h"
  #include "/usr/include/TooN/so3.h"
  #include "/usr/include/TooN/wls.h"

  // add namespaces
  namespace TooN{typedef int tmp_add_type_1;}
  TooN::tmp_add_type_1 tmp_add_func_1(){return 0;};
  namespace TooN{namespace Internal{typedef int tmp_add_type_2;}}
  TooN::Internal::tmp_add_type_2 tmp_add_func_2(){return 0;};

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

In file included from /tmp/dxhBxjDoZS/dump1.h:23:
/usr/include/TooN/functions/fadbad.h:37:10: fatal error: FADBAD++/fadiff.h: No such file or directory
   37 | #include <FADBAD++/fadiff.h>
      |          ^~~~~~~~~~~~~~~~~~~
compilation terminated.