[gcc r13-5053] libstdc++: Suppress -Waddress warning in tzdb.cc [PR108228]

[Jonathan Wakely]

https://gcc.gnu.org/g:74852a3a2cecbd6d7ac6ddc2d1a9b60b83367d60

commit r13-5053-g74852a3a2cecbd6d7ac6ddc2d1a9b60b83367d60
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jan 6 20:54:23 2023 +0000

    libstdc++: Suppress -Waddress warning in tzdb.cc [PR108228]
    
    For some tarets the weak symbol is always defined, so we get a warning
    that its address is never null. The warning isn't useful in this case,
    so suppress it.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/108228
            * src/c++20/tzdb.cc (zoneinfo_dir): Add diagnostic pragma.

Diff:
---
 libstdc++-v3/src/c++20/tzdb.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libstdc++-v3/src/c++20/tzdb.cc b/libstdc++-v3/src/c++20/tzdb.cc
index fa4f4c7a30c..7227fe7cfe6 100644
--- a/libstdc++-v3/src/c++20/tzdb.cc
+++ b/libstdc++-v3/src/c++20/tzdb.cc
@@ -1013,9 +1013,12 @@ namespace std::chrono
     string
     zoneinfo_dir()
     {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Waddress"
       static const string dir = __gnu_cxx::zoneinfo_dir_override
 				  ? __gnu_cxx::zoneinfo_dir_override()
 				  : _GLIBCXX_ZONEINFO_DIR;
+#pragma GCC diagnostic pop
       return dir;
     }