Fix various warnings

cmake/compilers/msvc.cmake

@@ -29,6 +29,15 @@ add_compile_options("$<$<COMPILE_LANGUAGE:C>:/W4>")
 # There are way too many of these to realistically deal with them
 add_compile_options("$<$<COMPILE_LANGUAGE:C>:/wd4267>")
 
+# C4206: nonstandard extension used: translation unit is empty
+add_compile_options("$<$<COMPILE_LANGUAGE:C>:/wd4206>")
+
+# C4324: 'struct': structure was padded due to alignment specifier
+add_compile_options("$<$<COMPILE_LANGUAGE:C>:/wd4324>")
+
+# C4200: nonstandard extension used: zero-sized array in struct/union
+add_compile_options("$<$<COMPILE_LANGUAGE:C>:/wd4200>")
+
 # MSVC doesn't understand __inline__, which libjpeg uses
 add_compile_definitions(__inline__=inline)
 

cmake/tools/CMakeLists.txt

@@ -65,13 +65,18 @@ set(LBURG_SOURCES
 )
 
 add_executable(q3asm ${Q3ASM_SOURCES})
-target_compile_options(q3asm PRIVATE -fno-strict-aliasing)
 set_output_dirs(q3asm)
 add_executable(q3lcc ${Q3LCC_SOURCES})
-target_compile_options(q3asm PRIVATE -fno-strict-aliasing)
 set_output_dirs(q3lcc)
 add_dependencies(q3lcc q3rcc q3cpp)
 
+if(CMAKE_C_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID MATCHES "^(Apple)?Clang$")
+    add_compile_options(-fno-strict-aliasing -Wno-unused-result
+        -Wno-pointer-to-int-cast -Wno-int-to-pointer-cast)
+elseif(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
+    add_compile_options(/wd4311 /wd4312)
+endif()
+
 add_executable(lburg ${LBURG_SOURCES})
 set_output_dirs(lburg)
 set(DAGCHECK_C ${CMAKE_BINARY_DIR}/dagcheck.c)