[patch, fortran] PR36457: option '-idirafter' undefined for fortran

[Daniel Franke]

Attached patch fixes an issue on cygwin where the 'idirafter' option is 
passed/added by default.


2008-12-07  Daniel Franke  <franke.daniel@gmail.com>

	PR 36457/fortran
	* lang.opt: Added option idirafter.
	* cpp.h (gfc_cpp_add_include_path_after): New prototype.
	* cpp.c (gfc_cpp_handle_option): Recognize and handle OPT_dirafter.
	(gfc_cpp_add_include_path_after): New, adds user-defined search path after
	any other paths.
	* invoke.texi (idirafter): New.
	(no-range-check): Fixed entry in option-index.


Tested on cygwin by Angelo Graziosi and on i686-pc-linux-gnu by me.

Ok for trunk?

	Daniel

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