PR65411 don't retry fclose on EINTR

	PR libstdc++/65411
	* config/io/basic_file_stdio.cc (__basic_file<char>::close()): Don't
	retry fclose on EINTR.

From-SVN: r244451

libstdc++-v3/ChangeLog

 2017-01-13  Jonathan Wakely  <jwakely@redhat.com>
 
+	PR libstdc++/65411
+	* config/io/basic_file_stdio.cc (__basic_file<char>::close()): Don't
+	retry fclose on EINTR.
+
 	* include/profile/base.h: Remove unused header that leads to header
 	cycle in C++17 mode.
 

libstdc++-v3/config/io/basic_file_stdio.cc

@@ -267,16 +267,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       {
 	int __err = 0;
 	if (_M_cfile_created)
-	  {
-	    // In general, no need to zero errno in advance if checking
-	    // for error first. However, C89/C99 (at variance with IEEE
-	    // 1003.1, f.i.) do not mandate that fclose must set errno
-	    // upon error.
-	    errno = 0;
-	    do
-	      __err = fclose(_M_cfile);
-	    while (__err && errno == EINTR);
-	  }
+	  __err = fclose(_M_cfile);
 	_M_cfile = 0;
 	if (!__err)
 	  __ret = this;