From 032c83807f95d83f2355f1c436909bb577b920bc Mon Sep 17 00:00:00 2001
From: Victor Zverovich <victor.zverovich@gmail.com>
Date: Thu, 10 Aug 2017 09:27:06 -0700
Subject: [PATCH] Fix a segfault in test on glibc 2.26 #551, take 2

---
 test/util-test.cc | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/test/util-test.cc b/test/util-test.cc
index 6cef7e81..6617b857 100644
--- a/test/util-test.cc
+++ b/test/util-test.cc
@@ -837,8 +837,21 @@ TEST(UtilTest, FormatSystemError) {
   fmt::format_system_error(message, EDOM, "test");
   EXPECT_EQ(fmt::format("test: {}", get_system_error(EDOM)), message.str());
   message.clear();
-  fmt::format_system_error(
-        message, EDOM, fmt::StringRef(0, std::numeric_limits<ssize_t>::max()));
+
+  // Check if std::allocator throws on allocating max size_t / 2 chars.
+  size_t max_size = std::numeric_limits<size_t>::max() / 2;
+  bool throws_on_alloc = false;
+  try {
+    std::allocator<char> alloc;
+    alloc.deallocate(alloc.allocate(max_size), max_size);
+  } catch (std::bad_alloc) {
+    throws_on_alloc = true;
+  }
+  if (!throws_on_alloc) {
+    fmt::print("warning: std::allocator allocates {} chars", max_size);
+    return;
+  }
+  fmt::format_system_error(message, EDOM, fmt::StringRef(0, max_size));
   EXPECT_EQ(fmt::format("error {}", EDOM), message.str());
 }