illumos gate

Build errors with gcc 10:

    In file included from db_mindex.cc:34:
    db_mindex.cc: In member function 'entry_object** db_mindex::prepare_results(int, db_index_entry_p, db_status*)':
    db_headers.h:184:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      184 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:328:3: note: in expansion of macro 'READUNLOCK2'
      328 |   READUNLOCK2(this, table, NULL, NULL,
          |   ^~~~~~~~~~~
    db_headers.h:184:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      184 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:349:2: note: in expansion of macro 'READUNLOCK2'
      349 |  READUNLOCK2(this, table, entries, entries,
          |  ^~~~~~~~~~~
    db_headers.h:174:4: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      174 |    if (that != 0) { \
          |    ^~
    db_mindex.cc:323:2: note: in expansion of macro 'READLOCK2'
      323 |  READLOCK2(table, NULL, "r table db_mindex::prepare_results", this);
          |  ^~~~~~~~~
    db_mindex.cc: In member function 'db_status db_mindex::first(entryp*, entry_object**)':
    db_headers.h:184:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      184 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:461:2: note: in expansion of macro 'READUNLOCK2'
      461 |  READUNLOCK2(this, table, ret, ret,
          |  ^~~~~~~~~~~
    db_headers.h:184:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      184 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:448:5: note: in expansion of macro 'READUNLOCK2'
      448 |     READUNLOCK2(this, table,
          |     ^~~~~~~~~~~
    db_headers.h:174:4: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      174 |    if (that != 0) { \
          |    ^~
    db_mindex.cc:438:2: note: in expansion of macro 'READLOCK2'
      438 |  READLOCK2(table, DB_LOCK_ERROR, "r table db_mindex::first", this);
          |  ^~~~~~~~~
    db_mindex.cc: In member function 'db_status db_mindex::next(entryp, entryp*, entry_object**)':
    db_headers.h:184:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      184 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:488:2: note: in expansion of macro 'READUNLOCK2'
      488 |  READUNLOCK2(this, table, ret, ret,
          |  ^~~~~~~~~~~
    db_headers.h:174:4: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      174 |    if (that != 0) { \
          |    ^~
    db_mindex.cc:478:2: note: in expansion of macro 'READLOCK2'
      478 |  READLOCK2(table, DB_LOCK_ERROR, "r db_mindex::next", this);
          |  ^~~~~~~~~
    db_mindex.cc: In member function 'db_status db_mindex::first(db_query*, db_next_index_desc**, entry_object**)':
    db_headers.h:184:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      184 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:570:2: note: in expansion of macro 'READUNLOCK2'
      570 |  READUNLOCK2(this, table, ret, ret,
          |  ^~~~~~~~~~~
    db_headers.h:174:4: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      174 |    if (that != 0) { \
          |    ^~
    db_mindex.cc:550:2: note: in expansion of macro 'READLOCK2'
      550 |  READLOCK2(table, DB_LOCK_ERROR, "r table db_mindex::first", this);
          |  ^~~~~~~~~
    db_mindex.cc: In member function 'db_status db_mindex::next(db_next_index_desc*, db_next_index_desc**, entry_object**)':
    db_headers.h:184:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      184 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:609:2: note: in expansion of macro 'READUNLOCK2'
      609 |  READUNLOCK2(this, table, ret, ret,
          |  ^~~~~~~~~~~
    db_headers.h:174:4: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      174 |    if (that != 0) { \
          |    ^~
    db_mindex.cc:587:2: note: in expansion of macro 'READLOCK2'
      587 |  READLOCK2(table, DB_LOCK_ERROR, "r table db_mindex::next", this);
          |  ^~~~~~~~~
    db_mindex.cc: In member function 'db_status db_mindex::remove(db_query*)':
    db_headers.h:158:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      158 |   if (that != 0) { \
          |   ^~
    db_mindex.cc:848:4: note: in expansion of macro 'WRITEUNLOCK2'
      848 |    WRITEUNLOCK2(table, this, DB_SUCCESS, DB_SUCCESS,
          |    ^~~~~~~~~~~~
    db_headers.h:158:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      158 |   if (that != 0) { \
          |   ^~
    db_mindex.cc:853:4: note: in expansion of macro 'WRITEUNLOCK2'
      853 |    WRITEUNLOCK2(table, this, DB_NOTFOUND, DB_NOTFOUND,
          |    ^~~~~~~~~~~~
    db_headers.h:158:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      158 |   if (that != 0) { \
          |   ^~
    db_mindex.cc:863:3: note: in expansion of macro 'WRITEUNLOCK2'
      863 |   WRITEUNLOCK2(table, this, DB_BADQUERY, DB_BADQUERY,
          |   ^~~~~~~~~~~~
    db_headers.h:158:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      158 |   if (that != 0) { \
          |   ^~
    db_mindex.cc:869:3: note: in expansion of macro 'WRITEUNLOCK2'
      869 |   WRITEUNLOCK2(table, this, DB_NOTFOUND, DB_NOTFOUND,
          |   ^~~~~~~~~~~~
    db_headers.h:158:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      158 |   if (that != 0) { \
          |   ^~
    db_mindex.cc:877:3: note: in expansion of macro 'WRITEUNLOCK2'
      877 |   WRITEUNLOCK2(table, this, s, s,
          |   ^~~~~~~~~~~~
    db_headers.h:158:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      158 |   if (that != 0) { \
          |   ^~
    db_mindex.cc:904:3: note: in expansion of macro 'WRITEUNLOCK2'
      904 |   WRITEUNLOCK2(table, this, DB_SUCCESS, DB_SUCCESS,
          |   ^~~~~~~~~~~~
    db_headers.h:158:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      158 |   if (that != 0) { \
          |   ^~
    db_mindex.cc:887:5: note: in expansion of macro 'WRITEUNLOCK2'
      887 |     WRITEUNLOCK2(table, this, DB_INTERNAL_ERROR,
          |     ^~~~~~~~~~~~
    db_headers.h:158:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      158 |   if (that != 0) { \
          |   ^~
    db_mindex.cc:897:5: note: in expansion of macro 'WRITEUNLOCK2'
      897 |     WRITEUNLOCK2(table, this, rstat, rstat,
          |     ^~~~~~~~~~~~
    db_headers.h:145:4: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      145 |    if (that != 0) { \
          |    ^~
    db_mindex.cc:837:2: note: in expansion of macro 'WRITELOCK2'
      837 |  WRITELOCK2(table, DB_LOCK_ERROR, "w table db_mindex::remove", this);
          |  ^~~~~~~~~~
    db_mindex.cc: In member function 'db_status db_mindex::add(db_query*, entry_object*)':
    db_headers.h:155:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      155 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:1023:2: note: in expansion of macro 'WRITEUNLOCK2'
     1023 |  WRITEUNLOCK2(this, table, rstat, rstat,
          |  ^~~~~~~~~~~~
    db_headers.h:155:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      155 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:962:4: note: in expansion of macro 'WRITEUNLOCK2'
      962 |    WRITEUNLOCK2(this, table,
          |    ^~~~~~~~~~~~
    db_headers.h:155:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      155 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:974:4: note: in expansion of macro 'WRITEUNLOCK2'
      974 |    WRITEUNLOCK2(this, table,
          |    ^~~~~~~~~~~~
    db_headers.h:155:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      155 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:1005:6: note: in expansion of macro 'WRITEUNLOCK2'
     1005 |      WRITEUNLOCK2(this, table,
          |      ^~~~~~~~~~~~
    db_headers.h:155:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      155 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:947:4: note: in expansion of macro 'WRITEUNLOCK2'
      947 |    WRITEUNLOCK2(this, table, rstat, rstat,
          |    ^~~~~~~~~~~~
    db_headers.h:155:3: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      155 |   if (this != 0) { \
          |   ^~
    db_mindex.cc:938:4: note: in expansion of macro 'WRITEUNLOCK2'
      938 |    WRITEUNLOCK2(this, table, DB_LOCK_ERROR, DB_LOCK_ERROR,
          |    ^~~~~~~~~~~~
    db_headers.h:145:4: error: 'nonnull' argument 'this' compared to NULL [-Werror=nonnull-compare]
      145 |    if (that != 0) { \
          |    ^~
    db_mindex.cc:934:2: note: in expansion of macro 'WRITELOCK2'
      934 |  WRITELOCK2(table, DB_LOCK_ERROR, "w table db_mindex::add", this);
          |  ^~~~~~~~~~
    cc1plus: all warnings being treated as errors

Testing done: build/install/boot.