r251680 - in /branches/gcc-5-branch/libstdc++-v...

[redi@gcc.gnu.org]

Author: redi
Date: Mon Sep  4 17:09:05 2017
New Revision: 251680

URL: https://gcc.gnu.org/viewcvs?rev=251680&root=gcc&view=rev
Log:
PR libstdc++/81751 don't call fflush(NULL)

Backport from mainline
2017-08-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/79820
	PR libstdc++/81751
	* config/io/basic_file_stdio.cc (sys_open(FILE*, ios_base::openmode)):
	Call fflush on the stream instead of calling sync() while _M_cfile is
	null. Restore original value of errno.
	* testsuite/ext/stdio_filebuf/char/79820.cc: New.
	* testsuite/ext/stdio_filebuf/char/81751.cc: New.

Added:
    branches/gcc-5-branch/libstdc++-v3/testsuite/ext/stdio_filebuf/char/79820.cc
    branches/gcc-5-branch/libstdc++-v3/testsuite/ext/stdio_filebuf/char/81751.cc
Modified:
    branches/gcc-5-branch/libstdc++-v3/ChangeLog
    branches/gcc-5-branch/libstdc++-v3/config/io/basic_file_stdio.cc