[committed] libstdc++: Disable over-zealous warnings about std::string copies [PR103332]

[Jonathan Wakely <jwakely@redhat.com>]

These warnings are triggered by perfectly valid code using std::string.
They're particularly bad when --enable-fully-dynamic-string is used,
because even std::string().begin() will give a warning.

Use pragmas to stop the troublesome warnings for copies done by
std::char_traits.

libstdc++-v3/ChangeLog:

	PR libstdc++/103332
	PR libstdc++/102958
	PR libstdc++/103483
	* include/bits/char_traits.h: Suppress stringop and array-bounds
	warnings.
---
 libstdc++-v3/include/bits/char_traits.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libstdc++-v3/include/bits/char_traits.h b/libstdc++-v3/include/bits/char_traits.h
index da3e0ffffaa..3f7befcf8b2 100644
--- a/libstdc++-v3/include/bits/char_traits.h
+++ b/libstdc++-v3/include/bits/char_traits.h
@@ -54,6 +54,11 @@ namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-overflow"
+#pragma GCC diagnostic ignored "-Wstringop-overread"
+#pragma GCC diagnostic ignored "-Warray-bounds"
+
   /**
    *  @brief  Mapping from character type to associated types.
    *
@@ -990,6 +995,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   } // namespace __detail
 #endif // C++20
 
+#pragma GCC diagnostic push
+
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
 
-- 
2.31.1