From 923005bd4fe6c4bec48db372dcefe6c90c9822bc Mon Sep 17 00:00:00 2001
From: Vladislav Shchapov <vladislav@shchapov.ru>
Date: Sun, 17 Dec 2023 21:33:17 +0500
Subject: [PATCH] Add stdlib version check for C++20 (#3754)

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
---
 include/fmt/core.h   |  9 ++++++---
 test/compile-test.cc | 15 +++++++++------
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/include/fmt/core.h b/include/fmt/core.h
index 9bfee019b550..f2e03b7cb98f 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -105,9 +105,12 @@
 #  define FMT_CONSTEXPR
 #endif
 
-#if ((FMT_CPLUSPLUS >= 202002L) &&                            \
-     (!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE > 9)) || \
-    (FMT_CPLUSPLUS >= 201709L && FMT_GCC_VERSION >= 1002)
+#if (FMT_CPLUSPLUS >= 202002L ||                                \
+     (FMT_CPLUSPLUS >= 201709L && FMT_GCC_VERSION >= 1002)) &&  \
+    ((!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE >= 10) &&  \
+     (!defined(_LIBCPP_VERSION) || _LIBCPP_VERSION >= 10000) && \
+     (!FMT_MSC_VERSION || FMT_MSC_VERSION >= 1928)) &&          \
+    defined(__cpp_lib_is_constant_evaluated)
 #  define FMT_CONSTEXPR20 constexpr
 #else
 #  define FMT_CONSTEXPR20
diff --git a/test/compile-test.cc b/test/compile-test.cc
index d6c7c64354fb..8551303efce3 100644
--- a/test/compile-test.cc
+++ b/test/compile-test.cc
@@ -280,15 +280,18 @@ TEST(compile_test, compile_format_string_literal) {
 #endif
 
 // MSVS 2019 19.29.30145.0 - Support C++20 and OK.
-// MSVS 2022 19.32.31332.0 - compile-test.cc(362,3): fatal error C1001: Internal
-// compiler error.
+// MSVS 2022 19.32.31332.0, 19.37.32826.1 - compile-test.cc(362,3): fatal error
+// C1001: Internal compiler error.
 //  (compiler file
 //  'D:\a\_work\1\s\src\vctools\Compiler\CxxFE\sl\p1\c\constexpr\constexpr.cpp',
 //  line 8635)
-#if ((FMT_CPLUSPLUS >= 202002L) &&                           \
-     (!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE > 9) && \
-     (!FMT_MSC_VERSION || FMT_MSC_VERSION < 1930)) ||        \
-    (FMT_CPLUSPLUS >= 201709L && FMT_GCC_VERSION >= 1002)
+#if (FMT_CPLUSPLUS >= 202002L ||                                \
+     (FMT_CPLUSPLUS >= 201709L && FMT_GCC_VERSION >= 1002)) &&  \
+    ((!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE >= 10) &&  \
+     (!defined(_LIBCPP_VERSION) || _LIBCPP_VERSION >= 10000) && \
+     (!FMT_MSC_VERSION ||                                       \
+      (FMT_MSC_VERSION >= 1928 && FMT_MSC_VERSION < 1930))) &&  \
+    defined(__cpp_lib_is_constant_evaluated)
 template <size_t max_string_length, typename Char = char> struct test_string {
   template <typename T> constexpr bool operator==(const T& rhs) const noexcept {
     return fmt::basic_string_view<Char>(rhs).compare(buffer) == 0;