From: Jonathan Wakely <jwakely@redhat.com>
Date: Tue, 18 Jul 2023 21:14:32 +0000 (+0100)
Subject: libstdc++: Avoid warning in std::format
X-Git-Tag: basepoints/gcc-15~7498
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2af0f4c34667efe9924fa4e3aa7b9a87617e5ccd;p=thirdparty%2Fgcc.git

libstdc++: Avoid warning in std::format

With -Wmaybe-uninitialized -Wsystem-headers there's a warning about
creating a string_view from an uninitalized array. Initializing the
first element of the array avoids the warning.

libstdc++-v3/ChangeLog:

	* include/std/format (__write_padded): Initialize first element
	of array to avoid a -Wmaybe-uninitialized warning.
---

diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format
index 9d5981e48829..9710bff3c034 100644
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -610,6 +610,7 @@ namespace __format
     {
       const size_t __buflen = 0x20;
       _CharT __padding_chars[__buflen];
+      __padding_chars[0] = _CharT();
       basic_string_view<_CharT> __padding{__padding_chars, __buflen};
 
       auto __pad = [&__padding] (size_t __n, _Out& __o) {