From d1e02c385539ce971fbad207ba9aaa32be9c7bac Mon Sep 17 00:00:00 2001
From: Alexey Edelev <alexey.edelev@qt.io>
Date: Wed, 9 Mar 2022 16:40:25 +0100
Subject: [PATCH] Add '-stdlib=libc++' only for c++ compilers

Pick-to: 6.2 6.3
Task-number: QTBUG-101602
Change-Id: I4ecbb73f845d94156189acfd1a3074b676c90fc4
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
---
 cmake/QtPlatformTargetHelpers.cmake | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/cmake/QtPlatformTargetHelpers.cmake b/cmake/QtPlatformTargetHelpers.cmake
index 270ed3167b9..4d5ad793742 100644
--- a/cmake/QtPlatformTargetHelpers.cmake
+++ b/cmake/QtPlatformTargetHelpers.cmake
@@ -27,8 +27,12 @@ function(qt_internal_setup_public_platform_target)
     endif()
 
     if (QT_FEATURE_stdlib_libcpp)
-        target_compile_options(Platform INTERFACE "-stdlib=libc++")
-        target_link_options(Platform INTERFACE "-stdlib=libc++")
+        target_compile_options(Platform INTERFACE "$<$<COMPILE_LANGUAGE:CXX>:-stdlib=libc++>")
+        set(libc_link_option "-stdlib=libc++")
+        if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.18")
+            set(libc_link_option "$<$<LINK_LANGUAGE:CXX>:-stdlib=libc++>")
+        endif()
+        target_link_options(Platform INTERFACE "${libc_link_option}")
     endif()
     if (QT_FEATURE_no_extern_direct_access)
         target_compile_options(Platform INTERFACE "-mno-direct-extern-access")