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

Message ID 20220301152627.900781-1-jwakely@redhat.com
State New
Headers show
Series [committed] libstdc++: Fix -Wmaybe-uninitialized false positive [PR103984] | expand

Commit Message

Jonathan Wakely March 1, 2022, 3:26 p.m. UTC 
Tested powerpc64le-linux, pushed to trunk.

-- >8 --

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.
---
 libstdc++-v3/include/bits/regex_compiler.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/libstdc++-v3/include/bits/regex_compiler.h b/libstdc++-v3/include/bits/regex_compiler.h
index 174aefe75f7..348c170c81a 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; }