gdb

gdb
	PR python/13281:
	* gdbtypes.h (TYPE_FLAG_ENUM): New macro.
	(struct main_type) <flag_flag_enum>: New field.
	* dwarf2read.c (process_enumeration_scope): Detect "flag" enums.
	* NEWS: Add entries.
	* c-valprint.c (c_val_print) <TYPE_CODE_ENUM>: Handle "flag"
	enums.
	* python/lib/gdb/printing.py (_EnumInstance): New class.
	(FlagEnumerationPrinter): Likewise.
gdb/doc
	* gdb.texinfo (gdb.printing): Document FlagEnumerationPrinter.
gdb/testsuite
	* gdb.base/printcmds.c (enum flag_enum): New.
	(three): New global.
	* gdb.base/printcmds.exp (test_print_enums): Add test for flag
	enum printing.
	* gdb.python/py-pp-maint.py (build_pretty_printer): Instantiate
	FlagEnumerationPrinter.
	* gdb.python/py-pp-maint.exp: Add tests for FlagEnumerationPrinter.
	* gdb.python/py-pp-maint.c (enum flag_enum): New.
	(fval): New global.