Add SemiDebug (-O1 with debug symbols) build mode and do not optimize Debug at all

Add -Wall to Debug modes for all compilers and -Wabi for non-MSVC
Use /Ox for MSVC Release mode (potentially higher optimization than /O2)

src/CMakeLists.txt

@@ -4,6 +4,24 @@ cmake_minimum_required( VERSION 2.6 )
 INCLUDE(CheckCSourceRuns)
 INCLUDE(CheckIncludeFiles)
 
+# Add custom SemiDebug build mode
+set(CMAKE_CXX_FLAGS_SEMIDEBUG "-O1 -g -Wall -Wabi" CACHE STRING
+	"Flags used by the C++ compiler during semidebug builds."
+	FORCE
+)
+set(CMAKE_C_FLAGS_SEMIDEBUG "-O1 -g -Wall -pedantic" CACHE STRING
+	"Flags used by the C compiler during semidebug builds."
+	FORCE
+)
+mark_as_advanced(
+	CMAKE_CXX_FLAGS_SEMIDEBUG
+	CMAKE_C_FLAGS_SEMIDEBUG
+)
+set(CMAKE_BUILD_TYPE "${CMAKE_BUILD_TYPE}" CACHE STRING
+	"Choose the type of build. Options are: None Debug SemiDebug RelWithDebInfo MinSizeRel."
+	FORCE
+)
+
 # Set some random things default to not being visible in the GUI
 mark_as_advanced(EXECUTABLE_OUTPUT_PATH LIBRARY_OUTPUT_PATH)
 
@@ -608,13 +626,15 @@ if(MSVC)
 	# Visual Studio
 
 	# EHa enables SEH exceptions (used for catching segfaults)
-	set(CMAKE_CXX_FLAGS_RELEASE "/EHa /O2 /Ob2 /Oi /Ot /Oy /GL /FD /MT /GS- /arch:SSE /fp:fast /D NDEBUG /D _HAS_ITERATOR_DEBUGGING=0 /TP")
+	set(CMAKE_CXX_FLAGS_RELEASE "/EHa /Ox /Ob2 /Oi /Ot /Oy /GL /FD /MT /GS- /arch:SSE /fp:fast /D NDEBUG /D _HAS_ITERATOR_DEBUGGING=0 /TP")
 	#set(CMAKE_EXE_LINKER_FLAGS_RELEASE "/LTCG /NODEFAULTLIB:\"libcmtd.lib\" /NODEFAULTLIB:\"libcmt.lib\"")
 	set(CMAKE_EXE_LINKER_FLAGS_RELEASE "/LTCG")
 
+	set(CMAKE_CXX_FLAGS_SEMIDEBUG "/MDd /Zi /Ob0 /O1 /RTC1 /Wall")
+
 	# Debug build doesn't catch exceptions by itself
 	# Add some optimizations because otherwise it's VERY slow
-	set(CMAKE_CXX_FLAGS_DEBUG "/MDd /Zi /Ob0 /Od /RTC1")
+	set(CMAKE_CXX_FLAGS_DEBUG "/MDd /Zi /Ob0 /Od /RTC1 /Wall")
 
 	# Flags for C files (sqlite)
 	# /MT = Link statically with standard library stuff
@@ -658,7 +678,8 @@ else()
 	else()
 		set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3 -fomit-frame-pointer")
 	endif(APPLE)
-	set(CMAKE_CXX_FLAGS_DEBUG "-g -O1 -Wall ${WARNING_FLAGS} ${OTHER_FLAGS}")
+	set(CMAKE_CXX_FLAGS_SEMIDEBUG "-g -O1 -Wall -Wabi ${WARNING_FLAGS} ${OTHER_FLAGS}")
+	set(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -Wall -Wabi ${WARNING_FLAGS} ${OTHER_FLAGS}")
 
 	if(USE_GPROF)
 		set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -pg")