linux: Add maintenance commands to test libthread_db
This commit adds two new commands which may be used to test thread debugging libraries used by GDB: * "maint check libthread-db" tests the thread debugging library GDB is using for the current inferior. * "maint set/show check-libthread-db" selects whether libthread_db tests should be run automatically as libthread_db is auto-loaded. The default is to not run tests automatically. The test itself is a basic integrity check exercising all libthread_db functions used by GDB on GNU/Linux systems. By extension this also exercises the proc_service functions provided by GDB that libthread_db uses. This functionality is useful for NPTL developers and libthread_db developers. It could also prove useful investigating bugs reported against GDB where the thread debugging library or GDB's proc_service layer is suspect. gdb/ChangeLog: * linux-thread-db.c (valprint.h): New include. (struct check_thread_db_info): New structure. (check_thread_db_on_load, tdb_testinfo): New static globals. (check_thread_db, check_thread_db_callback): New functions. (try_thread_db_load_1): Run integrity checks if requested. (maintenance_check_libthread_db): New function. (_initialize_thread_db): Register "maint check libthread-db" and "maint set/show check-libthread-db". * NEWS: Mention the above new commands. gdb/doc/ChangeLog: * gdb.texinfo (Maintenance Commands): Document "maint check libthread-db" and "maint set/show check-libthread-db". gdb/testsuite/ChangeLog: * gdb.threads/check-libthread-db.exp: New file. * gdb.threads/check-libthread-db.c: Likewise.
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