From 6c2e309a6667f0a6869becdeafcdc5e375116bda Mon Sep 17 00:00:00 2001
From: Raul Tambre <raul@tambre.ee>
Date: Sat, 6 Feb 2021 18:37:20 +0200
Subject: Clang: Set standard flags according to frontend variant

They depend on the frontend not which compiler we're simulating.

Fixes #21771.
---
 Modules/Compiler/Clang-C.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/Compiler/Clang-C.cmake b/Modules/Compiler/Clang-C.cmake
index 8f00a72..dc18607 100644
--- a/Modules/Compiler/Clang-C.cmake
+++ b/Modules/Compiler/Clang-C.cmake
@@ -25,7 +25,7 @@ elseif("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
   endif()
 endif()
 
-if(NOT "x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC")
+if("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
   if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 2.1)
     set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
     set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")
-- 
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