re PR fortran/33502 (gfortran with .F suffix and -g3 option chokes on preprocessor syntax)
PR fortran/33502 * scanner.c (gfc_advance_line): Call debug_hooks->start_source_file and debug_hooks->end_source_file when entering and exiting included files. (gfc_define_undef_line): New function. (load_file): Ignore #define and #undef preprocessor lines while reading source files. * parse.c (next_statement): Handle #define and #undef preprocessor lines. (gfc_parse_file): Call debug_hooks->start_source_file and debug_hooks->end_source_file for the main source file if requested by the debug format. * gfortran.h (gfc_define_undef_line): Add prototype. From-SVN: r128671
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