2012-04-11  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR 24985
gcc/
        * diagnostic.h (show_caret): Declare.
	(caret_max_width): Declare.
	(diagnostic_show_locus): Declare.
        * diagnostic.c (diagnostic_initialize): Initialize to false.
        (diagnostic_show_locus): New.
        (diagnostic_report_diagnostic): Call it.
	(getenv_columns): New.
	(adjust_line): New.
	(diagnostic_set_caret_max_width): New.
        * input.c (read_line): New.
	(location_get_source_line): New.
        * input.h (location_get_source_line): Declare.
        * toplev.c (general_init): Initialize show_caret from options.
        * dwarf2out.c (gen_producer_string): Handle fdiagnostics-show-caret.
        * opts.c (common_handle_option): Likewise.
	* pretty-print.h (pp_get_prefix): New.
	(pp_base_get_prefix): New.
        * common.opt (fdiagnostics-show-caret): New option.
	* doc/invoke.texi (fdiagnostics-show-caret): Document it.
testsuite/
        * lib/prune.exp: Add -fno-diagnostics-show-caret.
libstdc++-v3/
	* testsuite/lib/prune.exp: Handle caret.
libmudflap/
	* testsuite/lib/libmudflap.exp: Handle caret.

From-SVN: r186305