Added logging, refactored versioning; STB is now included

- Added logging
- Rewrote versioning code
- Refactored dependency management
  - STB (stb_image.h) is now included
  - All other dependencies now use find_package
- Cross-compilation from Linux to Windows is now possible

tools/build.sh

@@ -1,12 +1,15 @@
 #!/bin/bash
 
 usage=\
-"Usage: build.sh [OPTIONS...] [TOOL-ARGUMENT...]
+"Usage: build.sh [OPTIONS...]
 Build and run the game.
 
 Options:
       --debug            make a debug build (default)
       --release          make a release build
+      --build-id=ID      set the build ID. Default is dev.
+      --cmake-gen=ARGS   pass additional arguments to pass to cmake when
+                           generating build files. ARGS is the ;-separated list.
       --dont-generate    don't generate build instructions; use existing
                            configuration if building
       --dont-build       don't build; run existing binaries or generate build
@@ -25,6 +28,10 @@ Environment variables:
   CMAKE     cmake executable
   VALGRIND  valgrind executable
 
+private.sh variables:
+  private_cmake_gen_args  array of additional arguments to pass to cmake when
+                            generating build files
+
 See also: tools/cppcheck/use-cppcheck.sh --help
           tools/clang-format/use-clang-format.sh --help
           tools/setup.sh --help"
@@ -38,6 +45,7 @@ source "$rsrc/bashlib.sh"
 
 build_type=Debug
 do_generate=true
+cmake_gen_args=()
 do_build=true
 
 run_type=Normal
@@ -47,53 +55,63 @@ debug_vulkan=''
 memcheck_args=()
 
 for arg in "$@"; do
-
-    if [ $is_cmake_arg ]; then
-        cmake_args+=("$arg")
-    else
-        case "$arg" in
-            -h | --help )
-                echo "$usage"
-                exit
-                ;;
-            --debug )
-                build_type=Debug
-                ;;
-            --release )
-                build_type=Release
-                ;;
-            --debug-vulkan )
-                debug_vulkan=true
-                ;;
-            -R | --run )
-                do_run=true
-                ;;
-            --memcheck )
-                do_run=true
-                run_type=memcheck
-                ;;
-            --memcheck=* )
-                do_run=true
-                run_type=memcheck
-                readarray -t -d ';' new_memcheck_args <<<"${arg#*=};"
-                unset new_memcheck_args[-1]
-                memcheck_args+=("${new_memcheck_args[@]}")
-                unset new_memcheck_args
-                ;;
-            --dont-generate )
-                do_generate=''
-                ;;
-            --dont-build )
-                do_build=''
-                ;;
-            * )
-                fail "Unknown option '$arg'"
-                ;;
-        esac
-    fi
+    case "$arg" in
+        -h | --help )
+            echo "$usage"
+            exit
+            ;;
+        --debug )
+            build_type=Debug
+            ;;
+        --release )
+            build_type=Release
+            ;;
+        --build-id )
+            fail "Option --build-id=ID requires a parameter"
+            ;;
+        --build-id=* )
+            build_id="${arg#*=}"
+            ;;
+        --cmake-gen )
+            fail "Option --cmake-gen=ARGS requires a parameter"
+            ;;
+        --cmake-gen=* )
+            readarray -t -d ';' new_cmake_gen_args <<<"${arg#*=};"
+            unset new_cmake_gen_args[-1]
+            cmake_gen_args+=("${new_cmake_gen_args[@]}")
+            unset new_cmake_gen_args
+            ;;
+        --debug-vulkan )
+            debug_vulkan=true
+            ;;
+        -R | --run )
+            do_run=true
+            ;;
+        --memcheck )
+            do_run=true
+            run_type=memcheck
+            ;;
+        --memcheck=* )
+            do_run=true
+            run_type=memcheck
+            readarray -t -d ';' new_memcheck_args <<<"${arg#*=};"
+            unset new_memcheck_args[-1]
+            memcheck_args+=("${new_memcheck_args[@]}")
+            unset new_memcheck_args
+            ;;
+        --dont-generate )
+            do_generate=''
+            ;;
+        --dont-build )
+            do_build=''
+            ;;
+        * )
+            fail "Unknown option '$arg'"
+            ;;
+    esac
 done
 
-if [ -z "$do_build" -a -z "$do_generate" -a ${#cmake_args[@]} != 0 ]; then
+if [ -z "$do_build" -a -z "$do_generate" -a ${#cmake_gen_args[@]} != 0 ]; then
     fail "CMake arguments are set, but no build is requested. Aborting"
 fi
 
@@ -107,12 +125,23 @@ fi
 
 find_cmd CMAKE cmake
 if [ $do_generate ]; then
+
+    cmake_gen_managed_args=(
+        -DCMAKE_BUILD_TYPE=$build_type
+        -DVULKAN_ERROR_CHECKING=`[ $debug_vulkan ] && echo ON || echo OFF`
+        -UBUILD_ID
+    )
+
+    [ -n "${build_id+x}" ] && cmake_gen_managed_args+=(
+        -DBUILD_ID="$build_id"
+    )
+
     echo_and_run "$CMAKE" \
         -B "$build_dir" \
         -S "$source_dir" \
-        -DCMAKE_BUILD_TYPE=$build_type \
-        -DVULKAN_ERROR_CHECKING=`[ $debug_vulkan ] && echo ON || echo OFF` \
-        "${cmake_args[@]}" \
+        "${cmake_gen_managed_args[@]}" \
+        "${private_cmake_gen_args[@]}" \
+        "${cmake_gen_args[@]}" \
     || fail "Could not generate build files"
 fi