Make macOS SDL build portable, build script runnable locally

.gitignore

@@ -9,4 +9,6 @@ out/
 obj-amd64/
 obj-arm64/
 out-amd64/
-out-arm64/
+out-arm64/
+thirdparty/SDL/SDL
+thirdparty/SDL/libSDL2-2.0.0.dylib

ruby/GNUmakefile

@@ -26,6 +26,7 @@ ifeq ($(ruby),)
       ifeq ($(wildcard $(macsdl)),)
         $(error Tried to compile ruby for macOS with SDL2 linked, but no SDL2 library was found. Compile it with thirdparty/SDL/build-sdl.sh, or disable SDL by compiling ares with sdl2=false)
       endif
+      flags += -DMACOS_COMPILED_SDL
       ruby += audio.sdl
       ruby += input.sdl
     endif
@@ -63,6 +64,9 @@ endif
 
 ifeq ($(platform),macos)
   ruby.flags := $(flags.objcpp)
+  ifeq ($(sdl2),true)
+    ruby.flags += -I ../thirdparty/SDL/SDL/include/
+  endif
 else
   ruby.flags := $(flags.cpp)
 endif
@@ -71,7 +75,7 @@ ruby.flags += -I../thirdparty
 ruby.flags += $(foreach c,$(subst .,_,$(call strupper,$(ruby))),-D$c)
 ifeq ($(pkg_config),)
   # TODO: add SDL2 cflags
-else
+else ifeq ($(wildcard $(macsdl)),)
   ruby.flags += $(if $(findstring input.sdl,$(ruby)),$(shell $(pkg_config) sdl2 --cflags))
   ruby.flags += $(if $(findstring audio.sdl,$(ruby)),$(shell $(pkg_config) sdl2 --cflags))
 endif
@@ -100,7 +104,7 @@ ifeq ($(platform),windows)
     ruby.options += $(if $(findstring input.sdl,$(ruby)),$(shell $(pkg_config) sdl2 --libs --static))
     ruby.options += $(if $(findstring audio.sdl,$(ruby)),$(shell $(pkg_config) sdl2 --libs --static))
   endif
-else
+else ifeq ($(wildcard $(macsdl)),)
   ruby.options += $(if $(findstring input.sdl,$(ruby)),$(shell $(pkg_config) sdl2 --libs))
   ruby.options += $(if $(findstring audio.sdl,$(ruby)),$(shell $(pkg_config) sdl2 --libs))
 endif
@@ -116,6 +120,9 @@ endif
 ifeq ($(platform),macos)
   ruby.options += -framework IOKit
   ruby.options += $(if $(findstring audio.openal,$(ruby)),-framework OpenAL)
+  ifeq ($(sdl2),true)
+    ruby.options += -L../thirdparty/SDL/ -lSDL2-2.0.0
+  endif
 endif
 
 ifeq ($(platform),linux)

ruby/input/sdl.cpp

@@ -1,4 +1,8 @@
+#if defined(MACOS_COMPILED_SDL)
+#include "SDL.h"
+#else
 #include <SDL2/SDL.h>
+#endif
 
 #if defined(PLATFORM_WINDOWS)
 #include "shared/rawinput.cpp"

thirdparty/SDL/build-sdl.sh

@@ -9,11 +9,18 @@ fi
 git -C SDL reset --hard "$(cat HEAD)"
 mkdir -p SDL/build
 pushd SDL/build
-sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
+
+if [ -n "${GITHUB_ACTIONS+1}" ]; then
+    sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
+    echo "Set Xcode version in order to target macOS 10.11 when building SDL."
+fi
 cmake .. "-DCMAKE_OSX_ARCHITECTURES=arm64;x86_64" \
           -DCMAKE_OSX_DEPLOYMENT_TARGET=10.11
 cmake --build .
-sudo cmake --install .
-sudo xcode-select -s /Applications/Xcode_14.2.app/Contents/Developer
+
+if [ -n "${GITHUB_ACTIONS+1}" ]; then
+    sudo xcode-select -s /Applications/Xcode_14.2.app/Contents/Developer
+    echo "Set Xcode to 14.2 to continue build."
+fi
 popd
 cp SDL/build/libSDL2-2.0.0.dylib .