[committed] libstdc++: Initialize std::normal_distribution::_M_saved [PR 99536]

[Jonathan Wakely via Gcc-patches]

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.

Tested powerpc64le-linux. Committed to trunk.


commit 67e397660611990efd98f9e4106c1ee81f6803a4
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Thu Mar 11 16:43:51 2021

    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.

diff --git a/libstdc++-v3/include/bits/random.h 
b/libstdc++-v3/include/bits/random.h
index b74e9cfd504..877ac3406b6 100644
--- a/libstdc++-v3/include/bits/random.h
+++ b/libstdc++-v3/include/bits/random.h
@@ -2024,12 +2024,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       explicit
       normal_distribution(result_type __mean,
                          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)
       { }
 
       /**
@@ -2166,8 +2166,8 @@ _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;
     };
 
   /**