From ac12de7e0343efdac0d0aa42e982b1b84dbd6124 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 6 Jul 2021 16:07:15 +0200
Subject: Clear errno before calling strto*() functions

---
 libbuild2/utility.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libbuild2/utility.cxx b/libbuild2/utility.cxx
index 193610f..f7f3d41 100644
--- a/libbuild2/utility.cxx
+++ b/libbuild2/utility.cxx
@@ -603,6 +603,7 @@ namespace build2
     {
       const char* b (s.c_str ());
       char* e (nullptr);
+      errno = 0; // We must clear it according to POSIX.
       uint64_t v (strtoull (b, &e, 10)); // Can't throw.
 
       if (errno != ERANGE && e == b + s.size () && v <= max_num)
-- 
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