From 96bd9242acac77925e9b8f8897b877824ae5e5e1 Mon Sep 17 00:00:00 2001
From: Matthias Moulin <matthias.moulin@gmail.com>
Date: Sun, 7 Apr 2024 14:12:29 +0200
Subject: [PATCH] Resolved FMT_USE_CONSTEVAL for MSVC

---
 include/fmt/base.h | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/include/fmt/base.h b/include/fmt/base.h
index a249673f2ecd..f571ed9987bd 100644
--- a/include/fmt/base.h
+++ b/include/fmt/base.h
@@ -109,10 +109,14 @@
 #endif
 
 // Detect consteval, C++20 constexpr extensions and std::is_constant_evaluated.
-#if !defined(__cpp_lib_is_constant_evaluated)
+// DIVERGENCE BEGIN - Resolved FMT_USE_CONSTEVAL for MSVC
+#if FMT_CPLUSPLUS < 201709L
 #  define FMT_USE_CONSTEVAL 0
-#elif FMT_CPLUSPLUS < 201709L
+#elif FMT_MSC_VERSION && FMT_MSC_VERSION >= 1929
+#  define FMT_USE_CONSTEVAL 1
+#elif !defined(__cpp_lib_is_constant_evaluated)
 #  define FMT_USE_CONSTEVAL 0
+// DIVERGENCE END
 #elif FMT_GLIBCXX_RELEASE && FMT_GLIBCXX_RELEASE < 10
 #  define FMT_USE_CONSTEVAL 0
 #elif FMT_LIBCPP_VERSION && FMT_LIBCPP_VERSION < 10000
@@ -360,6 +364,11 @@ constexpr auto is_constant_evaluated(bool default_value = false) noexcept
 #elif defined(__cpp_lib_is_constant_evaluated)
   ignore_unused(default_value);
   return std::is_constant_evaluated();
+ // DIVERGENCE BEGIN - Resolved FMT_USE_CONSTEVAL for MSVC
+#elif FMT_MSC_VERSION && FMT_USE_CONSTEVAL
+	ignore_unused(default_value);
+	return std::is_constant_evaluated();
+// DIVERGENCE END
 #else
   return default_value;
 #endif