From 25d8df0b735c6b966b05cc3ce4a8f69cf20b199f Mon Sep 17 00:00:00 2001
From: =?utf8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>
Date: Thu, 16 Jan 2020 15:09:46 +0100
Subject: [PATCH] [Minor] do not pass invalid C warnings to C++ flags
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cc1plus: warning: command line option ‘-Wno-pointer-sign’ is valid for C/ObjC but not for C++
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++
---
 cmake/CompilerWarnings.cmake | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/cmake/CompilerWarnings.cmake b/cmake/CompilerWarnings.cmake
index b9bb7ffde..4dd011d98 100644
--- a/cmake/CompilerWarnings.cmake
+++ b/cmake/CompilerWarnings.cmake
@@ -35,10 +35,12 @@ IF(SUPPORT_WUNUSED_VAR)
     ADD_COMPILE_OPTIONS("-Wunused-variable")
 ENDIF(SUPPORT_WUNUSED_VAR)
 IF(SUPPORT_WPOINTER_SIGN)
-    ADD_COMPILE_OPTIONS("-Wno-pointer-sign")
+    # only valid for C
+    ADD_COMPILE_OPTIONS($<$<COMPILE_LANGUAGE:C>:-Wno-pointer-sign>)
 ENDIF(SUPPORT_WPOINTER_SIGN)
 IF(SUPPORT_WSTRICT_PROTOTYPES)
-    ADD_COMPILE_OPTIONS("-Wstrict-prototypes")
+    # only valid for C
+    ADD_COMPILE_OPTIONS($<$<COMPILE_LANGUAGE:C>:-Wstrict-prototypes>)
 ENDIF(SUPPORT_WSTRICT_PROTOTYPES)
 IF(SUPPORT_WSTRICT_ALIASING)
     ADD_COMPILE_OPTIONS("-Wno-strict-aliasing")
-- 
2.39.5