From 6b5944e839e2785b0354769454ec9e4c5b2c6976 Mon Sep 17 00:00:00 2001
From: Jordan Williams <19399197+jwillikers@users.noreply.github.com>
Date: Tue, 11 Feb 2020 06:30:18 -0600
Subject: [PATCH] fix -Wundef warnings

---
 toml/datetime.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/toml/datetime.hpp b/toml/datetime.hpp
index 0d56e76..3fdec44 100644
--- a/toml/datetime.hpp
+++ b/toml/datetime.hpp
@@ -20,7 +20,7 @@ namespace toml
 namespace detail
 {
 // TODO: find more sophisticated way to handle this
-#if _POSIX_C_SOURCE >= 1 || defined(_XOPEN_SOURCE) || defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || defined(_POSIX_SOURCE)
+#if (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 1) || defined(_XOPEN_SOURCE) || defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || defined(_POSIX_SOURCE)
 inline std::tm localtime_s(const std::time_t* src)
 {
     std::tm dst;
@@ -35,7 +35,7 @@ inline std::tm gmtime_s(const std::time_t* src)
     if (!result) { throw std::runtime_error("gmtime_r failed."); }
     return dst;
 }
-#elif _MSC_VER
+#elif defined(_MSC_VER)
 inline std::tm localtime_s(const std::time_t* src)
 {
     std::tm dst;