[gcc r12-5414] libstdc++: Suppress -Wstringop warnings [PR103332]

[Jonathan Wakely]

https://gcc.gnu.org/g:b8f2efaed02e8b03d215d74e42d3707761772f64

commit r12-5414-gb8f2efaed02e8b03d215d74e42d3707761772f64
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Nov 19 18:13:10 2021 +0000

    libstdc++: Suppress -Wstringop warnings [PR103332]
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/103332
            PR libstdc++/102958
            * testsuite/21_strings/basic_string/capacity/char/1.cc: Add
            -Wno-stringop-overflow.
            * testsuite/21_strings/basic_string/operators/char/1.cc:
            Likewise.
            * testsuite/experimental/filesystem/path/factory/u8path-char8_t.cc:
            Add -Wno-stringop-overread.

Diff:
---
 libstdc++-v3/testsuite/21_strings/basic_string/capacity/char/1.cc     | 3 +++
 libstdc++-v3/testsuite/21_strings/basic_string/operators/char/1.cc    | 3 +++
 .../testsuite/experimental/filesystem/path/factory/u8path-char8_t.cc  | 4 +++-
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/capacity/char/1.cc b/libstdc++-v3/testsuite/21_strings/basic_string/capacity/char/1.cc
index eea69771f79..e21181bd62c 100644
--- a/libstdc++-v3/testsuite/21_strings/basic_string/capacity/char/1.cc
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/capacity/char/1.cc
@@ -17,6 +17,8 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
+// { dg-options "-Wno-stringop-overflow" }
+
 // 21.3.3 string capacity
 
 #include <string>
@@ -59,6 +61,7 @@ void test01()
 
   std::string str05(30, 'q');
   std::string str06 = str05;
+  // The following triggers -Wstringop-overflow.  See PR 103332.
   str05 = str06 + str05;
   VERIFY( str05.capacity() >= str05.size() );
   VERIFY( str06.capacity() >= str06.size() );
diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/operators/char/1.cc b/libstdc++-v3/testsuite/21_strings/basic_string/operators/char/1.cc
index 3bdac19644f..514cd2dc65d 100644
--- a/libstdc++-v3/testsuite/21_strings/basic_string/operators/char/1.cc
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/operators/char/1.cc
@@ -17,6 +17,8 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
+// { dg-options "-Wno-stringop-overflow" }
+
 // 21.3.6 string operations
 
 #include <string>
@@ -31,6 +33,7 @@ int test01(void)
   // Should get this:
   // 1:8-chars_8-chars_
   // 2:8-chars_8-chars_
+  // The following triggers -Wstringop-overread.  See PR 103332.
   str1 = std::string("8-chars_") + "8-chars_";
   str1.c_str();
   // printf("1:%s\n", str1.c_str());
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/factory/u8path-char8_t.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/factory/u8path-char8_t.cc
index 26b04cd1cf1..985a5f8fbc1 100644
--- a/libstdc++-v3/testsuite/experimental/filesystem/path/factory/u8path-char8_t.cc
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/factory/u8path-char8_t.cc
@@ -15,7 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-options "-lstdc++fs -fchar8_t" }
+// { dg-options "-lstdc++fs -fchar8_t -Wno-stringop-overread" }
 // { dg-do run { target c++11 } }
 // { dg-require-filesystem-ts "" }
 
@@ -36,10 +36,12 @@ test01()
   p = fs::u8path(u8"\xf0\x9d\x84\x9e");
   VERIFY( p.u8string() == u8"\U0001D11E" );
 
+  // The following triggers -Wstringop-overread.  See PR 103332.
   std::u8string s1 = u8"filename2";
   p = fs::u8path(s1);
   VERIFY( p.u8string() == u8"filename2" );
 
+  // The following triggers -Wstringop-overread.  See PR 103332.
   std::u8string s2 = u8"filename3";
   p = fs::u8path(s2.begin(), s2.end());
   VERIFY( p.u8string() == u8"filename3" );