commit 29dad307b5d7cfdb6626c11c8e43ebff941c950b
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Mar 11 16:43:51 2021 +0000

    libstdc++: Initialize std::normal_distribution::_M_saved [PR 99536]
    
    This avoids a false positive -Wmaybe-uninitialized warning, by
    initializing _M_saved on construction.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/99536
            * include/bits/random.h (normal_distribution): Use
            default-initializer for _M_saved and _M_saved_available.
    
    (cherry picked from commit 67e397660611990efd98f9e4106c1ee81f6803a4)

diff --git a/libstdc++-v3/include/bits/random.h b/libstdc++-v3/include/bits/random.h
index b36781ed290..3385345d273 100644
--- a/libstdc++-v3/include/bits/random.h
+++ b/libstdc++-v3/include/bits/random.h
@@ -1974,12 +1974,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       explicit
       normal_distribution(result_type __mean = result_type(0),
 			  result_type __stddev = result_type(1))
-      : _M_param(__mean, __stddev), _M_saved_available(false)
+      : _M_param(__mean, __stddev)
       { }
 
       explicit
       normal_distribution(const param_type& __p)
-      : _M_param(__p), _M_saved_available(false)
+      : _M_param(__p)
       { }
 
       /**
@@ -2158,8 +2158,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 			const param_type& __p);
 
       param_type  _M_param;
-      result_type _M_saved;
-      bool        _M_saved_available;
+      result_type _M_saved = 0;
+      bool        _M_saved_available = false;
     };
 
   /**