Stop using readdir_r: glibc deprecated it and it's not a good idea

POSIX does not require that readdir() be reentrant even for operations
on different dirent objects, but all implementations (according to the
glibc documentation) already do that. Moreover, it's not a good idea to
use readdir_r since the buffer space is limited by the caller, so
certain file names may be too long (ENAMETOOLONG) -- we had a workaround
for QNX, but for no other OS. According to the glibc documentation, it
is expected that POSIX will mark readdir_r obsolete and instead require
some form of reentrancy for readdir.

This commit makes everyone use readdir instead. The macros in
qplatformdefs.h are left behind in case someone else is using them.

With glibc 2.24, we started getting:

 qplatformdefs.h:150:35: warning: ‘int readdir_r(DIR*, dirent*, dirent**)’ is deprecated [-Wdeprecated-declarations]
 qfilesystemiterator_unix.cpp:112:17: note: in expansion of macro ‘QT_READDIR_R’

Task-number: QTBUG-56088
Change-Id: I33dc971f005a4848bb8ffffd14749b4082f62e69
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: James McDonnell <jmcdonnell@blackberry.com>

0 files changed, 0 insertions, 0 deletions