docs

demos/variants/wscript

@@ -11,12 +11,12 @@ out = 'build'
 """
 Variant system for waf 1.6
 
-call for example
+Call for example:
 $ waf configure build_debug build_release clean_debug clean_release
-"""
 
-def options(opt):
-	opt.load('compiler_c')
+The builds will end in different build folders
+note how "bld.variant" is used to detect the current variant
+"""
 
 def configure(conf):
 
@@ -57,11 +57,8 @@ def build(bld):
 	# * add an 'env' parameter to a particular task generator:
 	#     bld.program(...,  env=bld.all_envs['release'].derive())
 
-# ------ new declaration for variants -------
-#
-# calling 'waf clean_debug debug' will build into another output directory
-# note how "bld.variant" is used to detect the current variant
-#
+def options(opt):
+	opt.load('compiler_c')
 
 def init(ctx):
 	from waflib.Build import BuildContext, CleanContext, InstallContext, UninstallContext
@@ -87,3 +84,27 @@ def init(ctx):
 	# the commands will be "build_win32/debug" or "build_win32/release"
 	# in this case you may want to modify Options.commands in this "init" function
 
+# --------------------------
+# or, if you want to memorize the default variant and just type "waf",
+#
+#def options(opt):
+#	opt.load('compiler_c')
+#def init(ctx):
+#	from waflib import ConfigSet, Options
+#	env = ConfigSet.ConfigSet()
+#	try:
+#		env.load('build/c4che/foo.txt')
+#	except:
+#		the_variant = 'debug'
+#	else:
+#		the_variant = env.the_variant or debug
+#	
+#	if getattr(Options.options, 'the_variant', ''):
+#		if Options.options.the_variant != the_variant:
+#			the_variant = env.the_variant = Options.options.the_variant
+#			env.store('build/c4che/foo.txt')
+#	
+#	for y in (BuildContext, CleanContext, InstallContext, UninstallContext):
+#		class tmp(y):
+#			variant = the_variant
+