[gcc r14-11496] libstdc++: Avoid bogus -Walloc-size-larger-than warning in test [PR116212]

[Jonathan Wakely]

https://gcc.gnu.org/g:30d7bca6c2a3d70ecafdc4b2cf807944c736214c

commit r14-11496-g30d7bca6c2a3d70ecafdc4b2cf807944c736214c
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Apr 1 11:02:43 2025 +0100

    libstdc++: Avoid bogus -Walloc-size-larger-than warning in test [PR116212]
    
    The compiler can't tell that the vector size fits in int, so it thinks
    it might overflow to a negative value, which would then be a huge
    positive size_t.  In reality, the vector size never exceeds five.
    
    There's no warning on trunk, so just change the local variable to use
    type unsigned so that we get rid of the warning on the branches.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/116212
            * testsuite/20_util/specialized_algorithms/uninitialized_move/constrained.cc:
            Use unsigned for vector size.

Diff:
---
 .../20_util/specialized_algorithms/uninitialized_move/constrained.cc    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/20_util/specialized_algorithms/uninitialized_move/constrained.cc b/libstdc++-v3/testsuite/20_util/specialized_algorithms/uninitialized_move/constrained.cc
index 62f933137d26..a9f7bbf0eb71 100644
--- a/libstdc++-v3/testsuite/20_util/specialized_algorithms/uninitialized_move/constrained.cc
+++ b/libstdc++-v3/testsuite/20_util/specialized_algorithms/uninitialized_move/constrained.cc
@@ -50,7 +50,7 @@ test01(std::vector<T> ix)
     {
       ix = saved_ix;
 
-      int size = ix.size();
+      unsigned size = ix.size();
       auto buffer = std::unique_ptr<char[]>(new char[sizeof(T)*size]);
       std::span<T> rx((T *)buffer.get(), size);