CMake: Improve build type detection

CMakeLists.txt

@@ -3,9 +3,6 @@
 
 # Set project name
 set(PROJECT "stowage")
-# Set debugging, ON/OFF
-set(DEBUG "ON")
-
 # ------------------------------------------
 
 # Add 'make run' target
@@ -18,29 +15,6 @@ add_custom_target(run
 cmake_minimum_required(VERSION 3.16 FATAL_ERROR)
 project(${PROJECT} CXX)
 
-# Check if the build should include debugging symbols
-option(DEBUG "" ${DEBUG})
-if(DEBUG)
-	# cmake -DDEBUG=on .. && make
-	message("--- Debug ---")
-	set(CMAKE_BUILD_TYPE "Debug")
-
-	# -Og     = Optimizations that do not interfere with debugging
-	# -Wall   = All warnings about contructions that are easily avoidable
-	# -Wextra = Extra warning flags not covered by -Wall
-	# -g      = Produce debugging information in OS's native format
-	# -pg     = Generate profile information for analysis with gprof
-	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Og -Wall -Wextra -g -pg")
-	# gprof <PROJECT> gmon.out > profile-data.txt
-else()
-	# cmake -DDEBUG=off .. && make
-	message("--- Release ---")
-	set(CMAKE_BUILD_TYPE "Release")
-
-	# -O3     = Optimizations that increases compilation time and performance
-	set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
-endif()
-
 # ------------------------------------------
 # Setup C++ compiler
 
@@ -48,6 +22,34 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
+# Compiler flags used for all build types
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wpedantic")
+# -Wall      = All warnings about contructions that are easily avoidable
+# -Wextra    = Extra warning flags not covered by -Wall
+# -Wpedantic = Warnings for compiler extensions not part of the standard
+
+# Set default build type if not specified
+set(DEFAULT_BUILD_TYPE Release)
+if(EXISTS ${CMAKE_SOURCE_DIR}/.git)
+	set(DEFAULT_BUILD_TYPE Debug)
+endif()
+if(NOT CMAKE_BUILD_TYPE)
+	set(CMAKE_BUILD_TYPE ${DEFAULT_BUILD_TYPE})
+endif()
+
+# Set build type specific compiler flags
+message("--- ${CMAKE_BUILD_TYPE} ---")
+if(${CMAKE_BUILD_TYPE} STREQUAL Debug)
+	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Og -g -pg")
+	# -Og = Optimizations that do not interfere with debugging
+	# -g  = Produce debugging information in OS's native format
+	# -pg = Generate profile information for analysis with gprof
+	# $ gprof <PROJECT> gmon.out > profile-data.txt
+elseif(${CMAKE_BUILD_TYPE} STREQUAL Release)
+	set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
+	# -O3 = Optimizations that increase compilation time and performance
+endif()
+
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 # ------------------------------------------