disable some spurious compiler warnings

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

CMakeLists.txt

@@ -43,6 +43,7 @@ if(CMAKE_SYSTEM_NAME MATCHES "BSD")
 endif()
 
 include(GNUInstallDirs)
+include(CheckCXXCompilerFlag)
 include(CheckIncludeFileCXX)
 include(CheckTypeSize)
 include(CMakePushCheckState)
@@ -59,6 +60,24 @@ set(KATIE_MICRO "2")
 set(KATIE_HEX "0x040902")
 set(KATIE_VERSION "${KATIE_MAJOR}.${KATIE_MINOR}.${KATIE_MICRO}")
 
+set(KATIE_NO_WARNINGS
+    # placement new used in private QVariant constructor functions
+    -Wno-placement-new
+    # QVector does not always use new/delete
+    -Wno-class-memaccess
+    # hot attribute used in function prototypes
+    -Wno-attributes
+    # deprecated X11, CUPS and OpenSSL API used
+    -Wno-deprecated -Wno-deprecated-declarations
+)
+foreach(nowarning ${KATIE_NO_WARNINGS})
+    string(REPLACE "-W" "" normalizednowarning "${nowarning}")
+    check_cxx_compiler_flag(${nowarning} CXX_${normalizednowarning})
+    if(CXX_${normalizednowarning})
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${nowarning}")
+    endif()
+endforeach()
+
 # only for the build process
 if(CMAKE_SYSTEM_PROCESSOR)
     string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" KATIE_PROCESSOR)

appveyor.yml

@@ -14,10 +14,6 @@ build_script:
         libicu-dev unixodbc-dev libpq-dev libmariadbclient-dev libmariadbd-dev liblz4-dev \
         libsqlite3-dev xorg-dev dbus-x11
 
-    export CFLAGS="$CFLAGS -w"
-
-    export CXXFLAGS="$CXXFLAGS -w"
-
     cmake . -Wno-dev -DKATIE_TESTS=ON -DKATIE_BENCHMARKS=ON -DKATIE_UTILS=ON -DKATIE_PCH=ON -DCMAKE_UNITY_BUILD=ON
 
     make -j $(nproc || echo 1)

mkspecs/mkspecs.cmake

@@ -28,7 +28,7 @@ if(NOT trycompilestandardpolicy EQUAL NEW)
     # using MATCHES in all checks due to CMP0054
     if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
-    elseif(CMAKE_CXX_COMPILER_ID MATCHES "(Clang|AppleClang)")
+    elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
     else()
         message(FATAL_ERROR "Unknown compiler '${CMAKE_CXX_COMPILER_ID}'")