add old warnings.pri file (copied from appbase project)

chatterino.pro

@@ -42,6 +42,7 @@ macx {
 # Submodules
 DEFINES += IRC_NAMESPACE=Communi
 
+include(lib/warnings.pri)
 include(lib/appbase.pri)
 include(lib/fmt.pri)
 include(lib/humanize.pri)

lib/warnings.pri

@@ -0,0 +1,42 @@
+# Define warning flags for Chatterino
+win32-msvc* {
+    QMAKE_CXXFLAGS_WARN_ON = /W4
+    # 4714 - function marked as __forceinline not inlined
+    # 4996 - occurs when the compiler encounters a function or variable that is marked as deprecated.
+    #        These functions may have a different preferred name, may be insecure or have
+    #        a more secure variant, or may be obsolete.
+    # 4505 - unreferenced local version has been removed
+    # 4127 - conditional expression is constant
+    # 4503 - decorated name length exceeded, name was truncated
+    # 4100 - unreferences formal parameter
+    # 4305 - possible truncation of data
+    # 4267 - possible loss of data in return
+    QMAKE_CXXFLAGS_WARN_ON += /wd4714
+    QMAKE_CXXFLAGS_WARN_ON += /wd4996
+    QMAKE_CXXFLAGS_WARN_ON += /wd4505
+    QMAKE_CXXFLAGS_WARN_ON += /wd4127
+    QMAKE_CXXFLAGS_WARN_ON += /wd4503
+    QMAKE_CXXFLAGS_WARN_ON += /wd4100
+    QMAKE_CXXFLAGS_WARN_ON += /wd4305
+    QMAKE_CXXFLAGS_WARN_ON += /wd4267
+
+} else {
+    QMAKE_CXXFLAGS_WARN_ON = -Wall
+    QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-function
+    QMAKE_CXXFLAGS_WARN_ON += -Wno-switch
+    QMAKE_CXXFLAGS_WARN_ON += -Wno-deprecated-declarations
+    QMAKE_CXXFLAGS_WARN_ON += -Wno-sign-compare
+    QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-variable
+
+    # Disabling strict-aliasing warnings for now, although we probably want to re-enable this in the future
+    QMAKE_CXXFLAGS_WARN_ON += -Wno-strict-aliasing
+
+    QMAKE_CXXFLAGS_WARN_ON += -Werror=return-type
+
+    equals(QMAKE_CXX, "clang++") {
+        QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-local-typedef
+        QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-private-field
+    } else {
+        QMAKE_CXXFLAGS_WARN_ON += -Wno-class-memaccess
+    }
+}