From: Jonathan Wakely <jwakely@redhat.com>
Date: Tue, 1 Mar 2022 09:33:21 +0000 (+0000)
Subject: libstdc++: Fix -Wmaybe-uninitialized false positive [PR103984]
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ad66b03b3c84786e73e73f09be19977b8f3c4ea3;p=test_jj.git

libstdc++: Fix -Wmaybe-uninitialized false positive [PR103984]

This fixes a false positive warning seen with LTO:

12/bits/regex_compiler.tcc:443:32: error: '__last_char._M_char' may be used uninitialized [-Werror=maybe-uninitialized]

Given that the std::regex code is not very efficient anyway, the
overhead of initializing this byte should be minimal.

libstdc++-v3/ChangeLog:

	PR middle-end/103984
	* include/bits/regex_compiler.h (_BracketMatcher::_M_char): Use
	default member initializer.
---

diff --git a/libstdc++-v3/include/bits/regex_compiler.h b/libstdc++-v3/include/bits/regex_compiler.h
index 174aefe..348c170 100644
--- a/libstdc++-v3/include/bits/regex_compiler.h
+++ b/libstdc++-v3/include/bits/regex_compiler.h
@@ -125,7 +125,7 @@ namespace __detail
       struct _BracketState
       {
 	enum class _Type : char { _None, _Char, _Class } _M_type = _Type::_None;
-	_CharT _M_char;
+	_CharT _M_char = _CharT();
 
 	void
 	set(_CharT __c) noexcept { _M_type = _Type::_Char; _M_char = __c; }