Merge from origin/emacs-27

6cd9ccb (origin/emacs-27) Fix compression of directories in Dired
42329e6 ; * etc/NEWS: Review of the whole text.
af5709f Further enhancement on `tramp-file-local-name'
fb43244 Objective C Mode imenu: cease recognizing "functions" with...
a18373a ; * etc/NEWS: Update the text about the XDG_CONFIG_HOME/em...
73fd8a4 Fix BSD and macOS builds w.r.t. pthread_setname_np (bug#38...
f54b243 Scale top-left coordinates in display-monitor-attributes-list
b46c75b xref-matches-in-files: Big Tramp speed-up
883b349 * lisp/net/tramp.el (tramp-file-local-name): Remove `save-...
c01f55f Fix rendering bug due to unsynchronized cairo surface size...
075f21c Avoid crash by access to cleared img->pixmap->data/img->ma...
16c6dfb Avoid assertion violations in very small-height windows
9063124 Use pthread_setname_np to set thread name

# Conflicts:
#	etc/NEWS
#	lisp/net/tramp.el

Author: rgmorris

configure.ac

@@ -1767,7 +1767,7 @@ AC_CHECK_HEADERS_ONCE(
   sys/sysinfo.h
   coff.h pty.h
   sys/resource.h
-  sys/utsname.h pwd.h utmp.h util.h sys/prctl.h)
+  sys/utsname.h pwd.h utmp.h util.h)
 
 AC_CACHE_CHECK([for ADDR_NO_RANDOMIZE],
   [emacs_cv_personality_addr_no_randomize],
@@ -4192,9 +4192,26 @@ pthread_sigmask strsignal setitimer timer_getoverrun \
 sendto recvfrom getsockname getifaddrs freeifaddrs \
 gai_strerror sync \
 getpwent endpwent getgrent endgrent \
-cfmakeraw cfsetspeed __executable_start log2 prctl)
+cfmakeraw cfsetspeed __executable_start log2 pthread_setname_np)
 LIBS=$OLD_LIBS
 
+if test "$ac_cv_func_pthread_setname_np" = "yes"; then
+  AC_CACHE_CHECK(
+   [whether pthread_setname_np takes a single argument],
+   [emacs_cv_pthread_setname_np_1arg],
+   [AC_COMPILE_IFELSE(
+     [AC_LANG_PROGRAM(
+       [[#include <pthread.h>]],
+       [[pthread_setname_np ("a");]])],
+     [emacs_cv_pthread_setname_np_1arg=yes],
+     [emacs_cv_pthread_setname_np_1arg=no])])
+  if test "$emacs_cv_pthread_setname_np_1arg" = "yes"; then
+    AC_DEFINE(
+      HAVE_PTHREAD_SETNAME_NP_1ARG, 1,
+      [Define to 1 if pthread_setname_np takes a single argument.])
+  fi
+fi
+
 dnl No need to check for posix_memalign if aligned_alloc works.
 AC_CHECK_FUNCS([aligned_alloc posix_memalign], [break])
 AC_CHECK_DECLS([aligned_alloc], [], [], [[#include <stdlib.h>]])