* gdb.base/fileio.c (test_lseek): typecast ofs_t ret variable to

	* gdb.base/fileio.c (test_lseek): typecast ofs_t ret variable to
	long type.
	(test_unlink): Correct printf string.
	* gdb.base/checkpoint.c (main): Correct fprintf string for variable i.
	* gdb.threads/attachstop-mt.c: Add #include <string.h>.