diff --git a/CMakeLists.txt b/CMakeLists.txt
index 415fa223c2..452c0dbcb2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -399,9 +399,12 @@ if (Boost_ADDED)
             set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthreads")
         endif()
 
-        target_compile_options(boost_heap INTERFACE -Wno-shadow)
-        target_compile_options(boost_icl INTERFACE -Wno-shadow)
-        target_compile_options(boost_asio INTERFACE -Wno-conversion -Wno-implicit-fallthrough)
+        target_compile_options(boost_heap INTERFACE $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-shadow>)
+        target_compile_options(boost_icl INTERFACE $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-shadow>)
+        target_compile_options(boost_asio INTERFACE
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-conversion>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-implicit-fallthrough>
+        )
     endif()
 endif()
 
diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index 7b4c481ba5..9fd1c6c2b1 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -114,11 +114,11 @@ if(ENABLE_CUBEB)
 
             set_target_properties(cubeb PROPERTIES COMPILE_OPTIONS "")
             target_compile_options(cubeb INTERFACE
-                -Wno-implicit-const-int-float-conversion
-                -Wno-shadow
-                -Wno-missing-declarations
-                -Wno-return-type
-                -Wno-uninitialized
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-implicit-const-int-float-conversion>
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-shadow>
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-missing-declarations>
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-return-type>
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-uninitialized>
             )
         else()
             target_compile_options(cubeb PRIVATE
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f6740420b7..718a98ed63 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -118,23 +118,25 @@ if (MSVC AND NOT CXX_CLANG)
 else()
     if (NOT MSVC)
         add_compile_options(
-            -fwrapv
-            -fno-rtti # Disable RTTI
-            -pipe
+            $<$<COMPILE_LANGUAGE:C,CXX>:-fwrapv>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-pipe>
+        )
+        # c++ only
+        add_compile_options(
+            $<$<COMPILE_LANGUAGE:CXX>:-fno-rtti # Disable RTTI
         )
     endif()
 
     add_compile_options(
-        -Werror=all
-        -Werror=extra
-        -Werror=missing-declarations
-        -Werror=shadow
-        -Werror=unused
-
-        -Wno-attributes
-        -Wno-invalid-offsetof
-        -Wno-unused-parameter
-        -Wno-missing-field-initializers
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wall>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wextra>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=shadow>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=unused>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-attributes>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-invalid-offsetof>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-unused-parameter>
+        $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-missing-field-initializers>
     )
     # iOS clang doesn't like this specific option
     if (NOT IOS)
@@ -144,16 +146,16 @@ else()
     if (CXX_CLANG OR CXX_ICC OR CXX_APPLE) # Clang, AppleClang, or Intel C++
         if (NOT MSVC)
             add_compile_options(
-                -Werror=shadow-uncaptured-local
-                -Werror=implicit-fallthrough
-                -Werror=type-limits
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=shadow-uncaptured-local>
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=implicit-fallthrough>
+                $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=type-limits>
             )
         endif()
 
         add_compile_options(
-            -Wno-braced-scalar-init
-            -Wno-unused-private-field
-            -Wno-nullability-completeness
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-braced-scalar-init>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-unused-private-field>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-nullability-completeness>
         )
     endif()
 
@@ -170,9 +172,9 @@ else()
         # These diagnostics would be great if they worked, but are just completely broken
         # and produce bogus errors on external libraries like fmt.
         add_compile_options(
-            -Wno-array-bounds
-            -Wno-stringop-overread
-            -Wno-stringop-overflow
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-array-bounds>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-stringop-overread>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-stringop-overflow>
         )
     endif()
 
@@ -261,6 +263,7 @@ endif()
 
 if (IOS)
     add_subdirectory(ios)
+    add_compile_options($<$<COMPILE_LANGUAGE:C,CXX>:-Wno-error>)
 endif()
 
 include(GenerateDepHashes)
diff --git a/src/video_core/CMakeLists.txt b/src/video_core/CMakeLists.txt
index 3324682639..b23bff78cb 100644
--- a/src/video_core/CMakeLists.txt
+++ b/src/video_core/CMakeLists.txt
@@ -363,14 +363,14 @@ else()
     if (APPLE)
         # error: declaration shadows a typedef in 'interval_base_set<SubType, DomainT, Compare, Interval, Alloc>'
         # error: implicit conversion loses integer precision: 'int' to 'boost::icl::bound_type' (aka 'unsigned char')
-        target_compile_options(video_core PRIVATE -Wno-shadow -Wno-unused-local-typedef)
+        target_compile_options(video_core PRIVATE
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-shadow>
+            $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-unused-local-typedef>
+        )
     else()
         target_compile_options(video_core PRIVATE -Werror=conversion)
     endif()
-
-    target_compile_options(video_core PRIVATE
-        -Wno-sign-conversion
-    )
+    target_compile_options(video_core PRIVATE $<$<COMPILE_LANGUAGE:C,CXX>:-Wno-sign-conversion>)
 
     # xbyak
     set_source_files_properties(macro/macro_jit_x64.cpp PROPERTIES COMPILE_OPTIONS "-Wno-conversion;-Wno-shadow")