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[PATCH] PR libstdc++/83598 don't modify flags passed to std::basic_regex constructors

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Wed, 27 Dec 2017 22:19:57 +0000
Subject: [PATCH] PR libstdc++/83598 don't modify flags passed to std::basic_regex constructors
Authentication-results: sourceware.org; auth=none

The standard requires that std::regex("", f).flags() == f so we
shouldn't modify the flags passed to the constructor. We can just
remove the code that does so, because the _Compiler class repeats the
code to conditionally set ECMAScript in the flags anyway, so there's
no need to do so for the value stored in the basic_regex::_M_flags
member.

	PR libstdc++/83598
	* include/bits/regex.h (basic_regex): Don't modify flags passed to
	constructors.
	* testsuite/28_regex/basic_regex/ctors/83598.cc: New test.

Tested powerpc64le-linux, committed to trunk. Backports to follow.

Attachment: patch.txt
Description: Text document

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