[committed] libstdc++: Fix -Wformat warning in std::string

[Jonathan Wakely]

The __throw_out_of_range_fmt function works like fprintf and so the
arguments corresponding to %zu specifiers need to be size_t. The
std::basic_string<C,T,A>::size_type type is A::size_type which is not
necessarily size_t. Add explicit casts to avoid a -Wformat warning with
-Wsystem-headers.

libstdc++-v3/ChangeLog:

        * include/bits/basic_string.h (basic_string::_M_check): Cast
        size_type arguments to size_t.
---

Tested powerpc64le-linux. Pushed to trunk.

 libstdc++-v3/include/bits/basic_string.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/bits/basic_string.h 
b/libstdc++-v3/include/bits/basic_string.h
index 708104984d2d..8ae6569f5016 100644
--- a/libstdc++-v3/include/bits/basic_string.h
+++ b/libstdc++-v3/include/bits/basic_string.h
@@ -411,7 +411,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        if (__pos > this->size())
          __throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > "
                                       "this->size() (which is %zu)"),
-                                  __s, __pos, this->size());
+                                  __s, (size_t)__pos, (size_t)this->size());
        return __pos;
       }
 
-- 
2.51.0