Refactor sample build and add --without-samples

samples/wscript

@@ -0,0 +1,11 @@
+def build(bld):
+
+    bld.program(
+        source = [ 'mem_alloc.cpp' ],
+        includes = [ '../include' ],
+        target = 'mem_alloc',
+        cxxflags = [ '-Wall', '-O3', '-g' ],
+        linkflags = '-s',
+        )
+
+# vim: ft=python ai ts=4 sw=4 sts=4 et

wscript

@@ -20,10 +20,14 @@ out = 'build'
 
 def options(opts):
     opts.load('compiler_cxx')
+    opts.add_option('--without-samples', action='store_true', default=False,
+                    help='do not build samples')
 
 def configure(conf):
     conf.load('compiler_cxx')
 
+    conf.env.SAMPLES = not conf.options.without_samples
+
     # override gcc defaults normally stored in _cache.py
     conf.env.SHLIB_MARKER = ''  # '-Wl,-Bdynamic'
     conf.env.STLIB_MARKER = ''  # '-Wl,-Bstatic'
@@ -40,13 +44,8 @@ def build(bld):
         )
 
     # build samples
-    bld.program(
-        source = [ 'samples/mem_alloc.cpp' ],
-        includes = [ 'include' ],
-        target = 'mem_alloc',
-        cxxflags = [ '-Wall', '-O3', '-g' ],
-        linkflags = '-s',
-        )
+    if bld.env.SAMPLES == True:
+        bld.recurse('samples')
 
 # helper functions
 def _prepare(args):