fix some warnings

CMakeLists.txt

@@ -3,6 +3,8 @@ cmake_minimum_required(VERSION 3.8 FATAL_ERROR)
 
 if(NOT DEFINED PROJECT_NAME)
     set(BUILD_AS_STANDALONE ON)
+else()
+    set(BUILD_AS_STANDALONE OFF)
 endif()
 
 project(vmath.hpp)
@@ -15,6 +17,26 @@ add_library(${PROJECT_NAME}.singles INTERFACE)
 target_compile_features(${PROJECT_NAME}.singles INTERFACE cxx_std_17)
 target_include_directories(${PROJECT_NAME}.singles INTERFACE singles)
 
+target_compile_options(${PROJECT_NAME}
+    INTERFACE
+    $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
+        -Wno-c++98-compat-pedantic
+        -Wno-ctad-maybe-unsupported
+        -Wno-double-promotion
+        -Wno-float-equal
+        -Wno-shadow
+        -Wno-unknown-warning-option>)
+
+target_compile_options(${PROJECT_NAME}.singles
+    INTERFACE
+    $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
+        -Wno-c++98-compat-pedantic
+        -Wno-ctad-maybe-unsupported
+        -Wno-double-promotion
+        -Wno-float-equal
+        -Wno-shadow
+        -Wno-unknown-warning-option>)
+
 if(BUILD_AS_STANDALONE)
     option(BUILD_WITH_UNTESTS "Build with unit tests" ON)
     if(BUILD_WITH_UNTESTS)