* cygheap.cc (cygheap_fixup_in_child): Drop call to set_dll_dir.

(init_cygheap::init_installation_root): Set installation_dir_len.
	(setup_cygheap): Drop call to set_dll_dir.
	* cygheap.h (struct init_cygheap): Add installation_dir_len member.
	(init_cygheap::set_dll_dir): Remove.
	* environ.cc (win_env::add_cache): Use stpcpy for speed.
	(posify_maybe): Use tmp_pathbuf buffer instead of stack.
	(raise_envblock): New function to resize Windows environment block.
	(build_env): Fix indentation.  Call raise_envblock function.  Check if
	$PATH exists and is non-empty.  If not, add PATH variable with Cygwin
	installation directory as content to Windows environment.  Explain why.

	* uinfo.cc (cygheap_pwdgrp::_nss_init): Fill UNICODE_STRING members
	on the fly.  Drop call to RtlInitUnicodeString.
	(pwdgrp::check_file): Ditto.

winsup/cygwin/cygheap.cc

@@ -83,7 +83,6 @@ cygheap_fixup_in_child (bool execed)
   _csbrk ((char *) child_proc_info->cygheap_max - (char *) cygheap);
   child_copy (child_proc_info->parent, false, "cygheap", cygheap, cygheap_max, NULL);
   cygheap_init ();
-  cygheap->set_dll_dir ();
   debug_fixup_after_fork_exec ();
   if (execed)
     {
@@ -188,9 +187,10 @@ init_cygheap::init_installation_root ()
 	       "Invalid DLL path");
 
   /* Copy result into installation_dir before stripping off "bin" dir and
-     revert to Win32 path.  This path is used in cygheap_init to call
-     SetDllDirectory. */
-  wcpncpy (installation_dir, installation_root, PATH_MAX);
+     revert to Win32 path.  This path is added to the Windows environment
+     in buildenv.  See there for a description. */
+  installation_dir_len = wcpncpy (installation_dir, installation_root, PATH_MAX)
+			 - installation_dir;
   installation_dir[1] = L'\\';
 
   /* If w < p, the Cygwin DLL resides in the root dir of a drive or network
@@ -264,7 +264,6 @@ setup_cygheap ()
   cygheap_init ();
   cygheap->user.init ();
   cygheap->init_installation_root (); /* Requires user.init! */
-  cygheap->set_dll_dir ();
   cygheap->pg.init ();
 }