I can't understand the file, "lang-specs.h".

[김건우 <gunwoo_kim@xxxxxxxxxx>]

I am writing to request any documents about the file “lang-specs.h”. I
can’t understand the contents of this file that will be included into
array default_compilers[] in “gcc.c”. Could you please send me any
documents that can explain following options on gcc driver? I cannot modify
“lang-specs.h” to integrate preprocessor with compiler for my own
language and I cannot find some documentation as to it.

{".c", "@c", 0, 1, 1},
  {"@c",
   /* cc1 has an integrated ISO C preprocessor.  We should invoke the
      external preprocessor if -save-temps is given.  */
     "%{E|M|MM:%(trad_capable_cpp) %(cpp_options) %(cpp_debug_options)}\
      %{!E:%{!M:%{!MM:\
          %{traditional|ftraditional:\
%eGNU C no longer supports -traditional without -E}\
       %{!combine:\
      %{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) \
        %(cpp_options) -o %{save-temps:%b.i} %{!save-temps:%g.i} \n\
            cc1 -fpreprocessed %{save-temps:%b.i} %{!save-temps:%g.i} \
            %(cc1_options)}\
      %{!save-temps:%{!traditional-cpp:%{!no-integrated-cpp:\
        cc1 %(cpp_unique_options) %(cc1_options)}}}\
          %{!fsyntax-only:%(invoke_as)}} \
      %{combine:\
      %{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) \
        %(cpp_options) -o %{save-temps:%b.i} %{!save-temps:%g.i}}\
      %{!save-temps:%{!traditional-cpp:%{!no-integrated-cpp:\
        cc1 %(cpp_unique_options) %(cc1_options)}}\
                %{!fsyntax-only:%(invoke_as)}}}}}}", 0, 1, 1},

I am look forward to your fast reply.

Best Regards,
Gun-Woo, Kim

Researcher Gun-Woo, Kim 
Core, Compiler 
TmaxSoft
Tel. 031-7797-362
Mobile. 017-398-1245
E-mail. gunwoo_kim@xxxxxxxxxx