From 472acf5d83e0f059c0d5938dea6556e21385a71c Mon Sep 17 00:00:00 2001
From: Yann Collet <Cyan4973@users.noreply.github.com>
Date: Mon, 9 Jun 2025 07:24:03 +0000
Subject: [PATCH] fix #4405

---
 build/cmake/CMakeModules/AddZstdCompilationFlags.cmake | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake b/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
index 25231b5ec..dbe4118eb 100644
--- a/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
+++ b/build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
@@ -1,5 +1,10 @@
-include(CheckCXXCompilerFlag)
 include(CheckCCompilerFlag)
+if(CMAKE_CXX_COMPILER)
+    include(CheckCXXCompilerFlag)
+    set(ZSTD_CXX_ENABLED TRUE)
+else()
+    set(ZSTD_CXX_ENABLED FALSE)
+endif()
 
 if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.18)
     set(ZSTD_HAVE_CHECK_LINKER_FLAG true)
@@ -21,7 +26,7 @@ function(EnableCompilerFlag _flag _C _CXX _LD)
             set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_flag}" PARENT_SCOPE)
         endif ()
     endif ()
-    if (_CXX)
+    if (_CXX AND ZSTD_CXX_ENABLED)
         CHECK_CXX_COMPILER_FLAG(${_flag} CXX_FLAG_${varname})
         if (CXX_FLAG_${varname})
             set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}" PARENT_SCOPE)