Fix a fatal Clang warning on Linux

Two fromstrerror_helper overloads are defined, to manage the fact that
strerror_r returns an int or a char* depending on the system. The problem
is that then only one overload used (again, depending on the actual
stderror_r return type), leading to one of the two overload to be unused
and thus triggering the unused function warning.

kernel/qsystemerror.cpp:64:27: error: unused function 'fromstrerror_helper' [-Werror,-Wunused-function]
    static inline QString fromstrerror_helper(int, const QByteArray &buf)

Change-Id: I6a1c8e1a4b7d14068b682db26002ff68ad36167c
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/corelib/kernel/qsystemerror.cpp b/src/corelib/kernel/qsystemerror.cpp
index 5c185e1d62..3b1d808520 100644
--- a/src/corelib/kernel/qsystemerror.cpp
+++ b/src/corelib/kernel/qsystemerror.cpp
@@ -61,11 +61,11 @@ namespace {
     // version in portable code. However, it's impossible to do that if
     // _GNU_SOURCE is defined so we use C++ overloading to decide what to do
     // depending on the return type
-    static inline QString fromstrerror_helper(int, const QByteArray &buf)
+    static inline Q_DECL_UNUSED QString fromstrerror_helper(int, const QByteArray &buf)
     {
         return QString::fromLocal8Bit(buf);
     }
-    static inline QString fromstrerror_helper(const char *str, const QByteArray &)
+    static inline Q_DECL_UNUSED QString fromstrerror_helper(const char *str, const QByteArray &)
     {
         return QString::fromLocal8Bit(str);
     }