SCons recipe: added cross-compile support.

SConstruct

@@ -72,6 +72,7 @@ opts.AddOptions(
     PathOption('boostlibdir', 'Directory where boost libraries are installed.', '/usr/lib'),
     ('boost_suffix', 'Suffix of boost libraries.'),
     PathOption('gettextdir', 'Root directory of Gettext\'s installation.', "", PathOption.PathAccept), 
+    ('host', 'Cross-compile host.', ''),
 	('cxxtool', 'Set c++ compiler command if not using standard compiler.'),
     BoolOption("fast", "Make scons faster at cost of less precise dependency tracking.", False)
     )
@@ -80,19 +81,21 @@ opts.AddOptions(
 # Setup
 #
 
+sys.path.append("./scons")
 env = Environment(tools=["tar", "gettext", "install"], options = opts, toolpath = ["scons"])
 
+opts.Save('.scons-option-cache', env)
+
 if env["PLATFORM"] == "win32":
     env.Tool("mingw")
     env['ENV']['PATH'] = os.environ["PATH"]
 else:
-    env.Tool("default")
+    from cross_compile import *
+    setup_cross_compile(env)
 
 if env.get('cxxtool',""):
 	env['CXX'] = env['cxxtool']
 
-opts.Save('.scons-option-cache', env)
-
 Help("""Arguments may be a mixture of switches and targets an any order.
 Switches apply to the entire build regrdless of where they are in the order.
 Important switches include:
@@ -163,7 +166,6 @@ def Warning(message):
     print message
     return False
 
-sys.path.append("./scons")
 from metasconf import init_metasconf
 conf = Configure(env, custom_tests = init_metasconf(env, ["cplusplus", "python_devel", "sdl", "boost"]), config_h = "config.h")
 

scons/cross_compile.py

@@ -0,0 +1,25 @@
+# vi: syntax=python:et:ts=4
+
+def setup_cross_compile(env):
+    if env["host"] == "mingw32":
+        env["PLATFORM"] = "win32"
+        env["PROGSUFFIX"] = ".exe"
+        env.Tool("mingw")
+    else:
+        env.Tool("default")
+
+    if env["host"]:
+        tools = [
+            "CXX",
+            "CC",
+            "AR",
+            "RANLIB",
+            "RC"
+            ]
+        for tool in tools:
+            if env.has_key(tool):
+                env[tool] = env["host"] + "-" + env[tool]
+
+        env.PrependUnique(CPPPATH="$prefix/include", LIBPATH="$prefix/lib")
+        if not env["sdldir"] and env["PLATFORM"] == "win32":
+            env["sdldir"] = "$prefix"

scons/sdl.py

@@ -84,6 +84,9 @@ def CheckOgg(context):
 '''
     #context.env.AppendUnique(LIBS = "SDL_mixer")
     context.Message("Checking for Ogg Vorbis support in SDL... ")
+    if context.env["host"]:
+        context.Result("n/a (cross-compile)")
+        return True
     (result, output) = context.TryRun(test_program, ".c")
     if result:
         context.Result("yes")