From c57a86ce6264a4b141dfb462964e4dad3c1b154c Mon Sep 17 00:00:00 2001
From: Frank LENORMAND <lenormf@gmail.com>
Date: Fri, 10 Sep 2021 16:34:38 +0300
Subject: [PATCH] src: Fix undefined behaviour

Cppcheck produces the following warnings:

```
shared_string.hh:27:49: portability: Shifting signed 32-bit value by 31 bits is implementation-defined behaviour
shared_string.hh:27:49: error: Signed integer overflow for expression '1<<31'.
```

Fixes #4340
---
 src/shared_string.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/shared_string.hh b/src/shared_string.hh
index a2c0345a..8455a31e 100644
--- a/src/shared_string.hh
+++ b/src/shared_string.hh
@@ -24,7 +24,7 @@ struct StringData : UseMemoryDomain<MemoryDomain::SharedString>
 private:
     StringData(int len) : refcount(0), length(len) {}
 
-    static constexpr uint32_t interned_flag = 1 << 31;
+    static constexpr uint32_t interned_flag = 1u << 31;
     static constexpr uint32_t refcount_mask = ~interned_flag;
 
     struct PtrPolicy