crimson/cmake: restrict -Wno-non-virtual-dtor to C++ sources

The seastar target exports -Wno-non-virtual-dtor as a PUBLIC compile
option, so it leaks to every target that links seastar, including C
sources such as crimson-common's reverse.c, producing:

  cc1: warning: command-line option '-Wno-non-virtual-dtor' is valid for C++/ObjC++ but not for C

Guard the option with $<COMPILE_LANGUAGE:CXX> so that it only applies to
C++ compilations.

Signed-off-by: Sun Yuechi <sunyuechi@iscas.ac.cn>

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a93a38d7501f14e1a5ee3a0d85c97b53e94fe48c..b5fd500e8eae7ca053279663ab0385860272737e 100644 (file)
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -502,7 +502,7 @@ if(WITH_CRIMSON)
   target_compile_options(seastar
   PUBLIC
     # required by any target that links to seastar
-    "-Wno-non-virtual-dtor"
+    "$<$<COMPILE_LANGUAGE:CXX>:-Wno-non-virtual-dtor>"
   PRIVATE
     "-DSEASTAR_NO_EXCEPTION_HACK"
     "-Wno-error"