From c716531bd4fe41ab2643222caa8251328c0b7028 Mon Sep 17 00:00:00 2001
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 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Wed, 27 Nov 2024 23:25:41 +0300
Subject: [PATCH] =?UTF-8?q?mdbx-cmake:=20=D0=B8=D1=81=D0=BF=D0=BE=D0=BB?=
 =?UTF-8?q?=D1=8C=D0=B7=D0=BE=D0=B2=D0=B0=D0=BD=D0=B8=D0=B5=20`CMAKE=5FC?=
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---
 CMakeLists.txt | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c8c25a74..2e28776a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -566,11 +566,17 @@ endif()
 list(FIND CMAKE_C_COMPILE_FEATURES c_std_11 HAS_C11)
 list(FIND CMAKE_C_COMPILE_FEATURES c_std_23 HAS_C23)
 if(NOT DEFINED MDBX_C_STANDARD)
-  # MSVC >= 19.28 (Microsoft Visual Studio 16.8) is mad! It unable process
-  # Windows SDK headers in the C11 mode!
-  if(MSVC
-     AND MSVC_VERSION GREATER 1927
-     AND NOT MSVC_VERSION GREATER 1929)
+  if(DEFINED ENV{CMAKE_C_STANDARD})
+    set(CMAKE_C_STANDARD $ENV{CMAKE_C_STANDARD})
+  endif()
+  if(DEFINED CMAKE_C_STANDARD)
+    set(MDBX_C_STANDARD ${CMAKE_C_STANDARD})
+  elseif(
+    MSVC
+    # MSVC >= 19.28 (Microsoft Visual Studio 16.8) is mad! It unable process
+    # Windows SDK headers in the C11 mode!
+    AND MSVC_VERSION GREATER 1927
+    AND NOT MSVC_VERSION GREATER 1929)
     set(MDBX_C_STANDARD 99)
     set(C_FALLBACK_11 OFF)
     set(C_FALLBACK_GNU11 OFF)