[committed] libstdc++: Fix unused warning for new variable

[Jonathan Wakely via Gcc-patches]

Tested powerpc64le-linux and x86_64-linux. Pushed to trunk.

-- >8 --

This newly-introduced variable isn't used on all paths, so add the
[[maybe_unused]] attribute.

libstdc++-v3/ChangeLog:

        * src/c++11/random.cc (random_device::_M_init): Add maybe_unused
        attribute.
---
 libstdc++-v3/src/c++11/random.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libstdc++-v3/src/c++11/random.cc b/libstdc++-v3/src/c++11/random.cc
index cece6edbfc7..75989bd3337 100644
--- a/libstdc++-v3/src/c++11/random.cc
+++ b/libstdc++-v3/src/c++11/random.cc
@@ -374,11 +374,11 @@ namespace std _GLIBCXX_VISIBILITY(default)
                                      " unsupported token"));
 
 #if defined ENOSYS
-    const int unsupported = ENOSYS;
+    [[maybe_unused]] const int unsupported = ENOSYS;
 #elif defined ENOTSUP
-    const int unsupported = ENOTSUP;
+    [[maybe_unused]] const int unsupported = ENOTSUP;
 #else
-    const int unsupported = 0;
+    [[maybe_unused]] const int unsupported = 0;
 #endif
     int err = 0;
 
-- 
2.41.0