sort: not a special case for mbrtowc

* configure.ac (GNULIB_MBRTOWC_SINGLE_THREAD): Define.

diff --git a/configure.ac b/configure.ac
index a3e5b22016e31beb7e4a6133311fffbceef4cb09..eec1107906a4cb441f832a33d5765d94956999b6 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -70,11 +70,11 @@ AC_DEFINE([GNULIB_EXCLUDE_SINGLE_THREAD], [1],
   [Define to 1 if apps call 'exclude' functions from a single thread.])
 AC_DEFINE([GNULIB_REGEX_SINGLE_THREAD], [1],
   [Define to 1 if apps call 'regex' functions from a single thread.])
-# This is unsafe, since 'sort' uses mbrtowc indirectly, possibly from
-# multiple threads.
-# AC_DEFINE([GNULIB_MBRTOWC_SINGLE_THREAD], [1],
-#   [Define to 1 if apps call mbrtowc, mbrtoc32, and 'regex' functions
-#    from a single thread.])
+# Although 'sort' is multithreaded and can use these functions,
+# it uses them only from the main thread.
+AC_DEFINE([GNULIB_MBRTOWC_SINGLE_THREAD], [1],
+  [Define to 1 if apps call mbrtowc, mbrtoc32, and 'regex' functions
+   from a single thread.])
 # This is safe, since all apps set locale early.
 AC_DEFINE([GNULIB_WCHAR_SINGLE_LOCALE], [1],
   [Define to 1 if apps don't set the locale after calling