Added crosscompiling for linux-windows; Added makefile

Makefile

@@ -0,0 +1,48 @@
+
+GODOT_BIN_PATH = ../godot_fork/bin/godot.x11.tools.64.llvm
+HEADERS = ../godot_headers
+TARGET = debug
+NAME = godot-cpp
+
+BASE = scons n=$(NAME) generate_bindings=yes target=$(TARGET) headers=$(HEADERS) godotbinpath=godot -j4
+LINUX = $(BASE) p=linux
+WINDOWS = $(BASE) p=windows
+OSX = $(BASE) p=osx
+
+
+all:
+	make linux
+	make windows
+
+
+linux:
+	make linux32
+	make linux64
+
+linux32: SConstruct
+	$(LINUX) a=32
+
+linux64: SConstruct
+	$(LINUX) a=64
+
+
+windows:
+	make windows32
+	make windows64
+
+windows32: SConstruct
+	$(WINDOWS) a=32
+
+windows64: SConstruct
+	$(WINDOWS) a=64
+
+
+osx:
+	make osx32
+	make osx64
+
+osx32: SConstruct
+	$(OSX) a=32
+
+osx64: SConstruct
+	$(OSX) a=64

SConstruct

@@ -1,48 +1,83 @@
 #!python
-import os, subprocess
 
+import os, subprocess, platform
 
+
+def add_source(sources, name):
+  sources.append(name)
+
+def add_sources(sources, dir, extension):
+  for f in os.listdir(dir):
+      if f.endswith('.' + extension):
+          sources.append(dir + '/' + f)
+
+
+env = Environment()
+host_platform = platform.system()
+target_platform = ARGUMENTS.get('p', ARGUMENTS.get('platform', 'linux'))
+target_arch = ARGUMENTS.get('a', ARGUMENTS.get('arch', '64'))
+# default to debug build, must be same setting as used for cpp_bindings
+target = ARGUMENTS.get('target', 'debug')
 # Local dependency paths, adapt them to your setup
-godot_headers_path = ARGUMENTS.get("headers", os.getenv("GODOT_HEADERS", "../godot_headers/"))
-godot_bin_path = ARGUMENTS.get("godotbinpath", os.getenv("GODOT_BIN_PATH", "../godot_fork/bin/godot.x11.tools.64.llvm"))
+godot_headers = ARGUMENTS.get('headers', '../godot_headers')
+godot_bin_path = ARGUMENTS.get('godotbinpath', os.getenv('GODOT_BIN_PATH', '../godot_fork/bin/godot.x11.tools.64.llvm'))
+result_path = 'bin/'
+result_name = ARGUMENTS.get('n', ARGUMENTS.get('name', os.path.relpath('.', '..')))
 
-target = ARGUMENTS.get("target", "debug")
-platform = ARGUMENTS.get("p", ARGUMENTS.get("platform", "linux"))
 
 # This makes sure to keep the session environment variables on windows, 
 # that way you can run scons in a vs 2017 prompt and it will find all the required tools
 env = Environment()
-if platform == "windows":
+if target_platform == 'windows':
     env = Environment(ENV = os.environ)
 
-if ARGUMENTS.get("use_llvm", "no") == "yes":
-    env["CXX"] = "clang++"
+if ARGUMENTS.get('use_llvm', 'no') == 'yes':
+    env['CXX'] = 'clang++'
+
 
-def add_sources(sources, directory):
-    for file in os.listdir(directory):
-        if file.endswith('.cpp'):
-            sources.append(directory + '/' + file)
+if target_platform == 'linux':
+    result_name += '.linux.' + target_arch
 
+    env['CXX']='gcc-5'
+    env.Append(CCFLAGS = [ '-fPIC', '-g', '-O3', '-std=c++14', '-Wwrite-strings' ])
+    env.Append(LINKFLAGS = [ '-Wl,-R,\'$$ORIGIN\'' ])
 
-if platform == "osx":
-    env.Append(CCFLAGS = ['-g','-O3', '-std=c++14', '-arch', 'x86_64'])
-    env.Append(LINKFLAGS = ['-arch', 'x86_64', '-framework', 'Cocoa', '-Wl,-undefined,dynamic_lookup'])
+    if target_arch == '32':
+        env.Append(CCFLAGS = [ '-m32' ])
+        env.Append(LINKFLAGS = [ '-m32' ])
+    elif target_arch == '64':
+        env.Append(CCFLAGS = [ '-m64' ])
+        env.Append(LINKFLAGS = [ '-m64' ])
 
-if platform == "linux":
-    env.Append(CCFLAGS = ['-fPIC', '-g','-O3', '-std=c++14'])
+elif target_platform == 'windows':
+    result_name += '.windows.' + target_arch
 
-env.Append(CPPPATH=['.', godot_headers_path, 'include', 'include/core'])
+    if host_platform == 'Windows':
+        result_name += '.dll'
 
-if platform == "windows":
-    if target == "debug":
-        env.Append(CCFLAGS = ['-EHsc', '-D_DEBUG', '/MDd'])
+        env.Append(LINKFLAGS = [ '/WX' ])
+        if target == 'debug':
+            env.Append(CCFLAGS = ['-EHsc', '-D_DEBUG', '/MDd' ])
+        else:
+            env.Append(CCFLAGS = ['-O2', '-EHsc', '-DNDEBUG', '/MD' ])
     else:
-        env.Append(CCFLAGS = ['-O2', '-EHsc', '-DNDEBUG', '/MD'])
+        if target_arch == '32':
+            env['CXX']='i686-w64-mingw32-g++'
+        elif target_arch == '64':
+            env['CXX']='x86_64-w64-mingw32-g++'
 
-sources = []
-add_sources(sources, "src/core")
+        env.Append(CCFLAGS = [ '-g', '-O3', '-std=c++14', '-Wwrite-strings' ])
+        env.Append(LINKFLAGS = [ '--static', '-Wl,--no-undefined', '-static-libgcc', '-static-libstdc++' ])
+
+elif platform == 'osx':
+    env.Append(CCFLAGS = [ '-g','-O3', '-std=c++14', '-arch', 'x86_64' ])
+    env.Append(LINKFLAGS = [ '-arch', 'x86_64', '-framework', 'Cocoa', '-Wl,-undefined,dynamic_lookup' ])
 
-if ARGUMENTS.get("generate_bindings", "no") == "yes":
+
+env.Append(CPPPATH=['.', godot_headers, 'include', 'include/core'])
+
+
+if ARGUMENTS.get('generate_bindings', 'no') == 'yes':
     # TODO Generating the API should be done only if the Godot build is more recent than the JSON file
     json_api_file = os.path.join(os.getcwd(), 'godot_api.json')
 
@@ -52,11 +87,13 @@ if ARGUMENTS.get("generate_bindings", "no") == "yes":
     
     import binding_generator
 
-    
     binding_generator.generate_bindings(json_api_file)
 
-add_sources(sources, "src")
 
-library = env.StaticLibrary(target='bin/godot_cpp_bindings', source=sources)
-Default(library)
+sources = []
+add_sources(sources, 'src/core', 'cpp')
+add_sources(sources, 'src', 'cpp')
 
+
+library = env.StaticLibrary(target=result_path + '/' + result_name, source=sources)
+Default(library)