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To list absolute paths of include files, use
Instead of outputting the result of preprocessing, output a rule suitable for make describing the dependencies of the main source file. The preprocessor outputs one make rule containing the object file name for that source file, a colon, and the names of all the included files, including those coming from -include or -imacros command line options.
gcc -M test.c
If you dont want the system includes like
Like -M but do not mention header files that are found in system header directories, nor header files that are included, directly or indirectly, from such a header.
gcc -MM test.c