scons: better handling of PYTHON_INCLUDES and HAVE_LIBXML2

SConstruct

@@ -333,7 +333,8 @@ pickle_store = [# Scons internal variables
         'HAS_BOOST_SYSTEM',
         'SVN_REVISION',
         'HAS_CAIRO',
-        'HAS_PYCAIRO'
+        'HAS_PYCAIRO',
+        'HAS_LIBXML2'
         ]
 
 # Add all other user configurable options to pickle pickle_store
@@ -726,6 +727,7 @@ if not preconfigured:
     env['SKIPPED_DEPS'] = []
     env['HAS_CAIRO'] = False
     env['HAS_PYCAIRO'] = False
+    env['HAS_LIBXML2'] = False
     
     env['LIBDIR_SCHEMA'] = LIBDIR_SCHEMA
     env['PLUGINS'] = PLUGINS
@@ -778,7 +780,7 @@ if not preconfigured:
         env.Append(CXXFLAGS = '-DBOOST_PROPERTY_TREE_XML_PARSER_TINYXML -DTIXML_USE_STL')
     elif env['XMLPARSER'] == 'libxml2':
         if conf.parse_config('XML2_CONFIG'):
-            env.Append(CXXFLAGS = '-DHAVE_LIBXML2')
+            env['HAS_LIBXML2'] = True
             
     if env['CAIRO'] and conf.CheckPKGConfig('0.15.0') and conf.CheckPKG('cairomm-1.0'):
         env['HAS_CAIRO'] = True
@@ -1084,11 +1086,18 @@ if not preconfigured:
                
             majver, minver = env['PYTHON_VERSION'].split('.')
  
-            # TODO - this needs to be moved up...
+            # we don't want the includes it in the main environment...
+            # as they are later set in the python SConscript
+            # ugly hack needed until we have env specific conf
+            backup = env.Clone().Dictionary()
             env.AppendUnique(CPPPATH = env['PYTHON_INCLUDES'])
+            
             if not conf.CheckHeader(header='Python.h',language='C'):
                 color_print(1,'Could not find required header files for the Python language (version %s)' % env['PYTHON_VERSION'])
+                env.Replace(**backup)
                 env['MISSING_DEPS'].append('python %s development headers' % env['PYTHON_VERSION'])
+            else:
+                env.Replace(**backup)
        
             if (int(majver), int(minver)) < (2, 2):
                 color_print(1,"Python version 2.2 or greater required")

agg/SConscript

@@ -21,7 +21,9 @@ import glob
 
 Import('env')
 
+agg_env = env.Clone()
+
 if env['PLATFORM'] == 'SunOS':
-    env.StaticLibrary('agg', glob.glob('./src/' + '*.cpp'), LIBS=[], CPPPATH='./include', CXXFLAGS='-O -KPIC -DNDEBUG')
+    agg_env.StaticLibrary('agg', glob.glob('./src/' + '*.cpp'), LIBS=[], CPPPATH='./include', CXXFLAGS='-O -KPIC -DNDEBUG')
 else:
-    env.StaticLibrary('agg', glob.glob('./src/' + '*.cpp'), LIBS=[], CPPPATH='./include', CXXFLAGS='-O%s -fPIC -DNDEBUG' % env['OPTIMIZATION'])
+    agg_env.StaticLibrary('agg', glob.glob('./src/' + '*.cpp'), LIBS=[], CPPPATH='./include', CXXFLAGS='-O%s -fPIC -DNDEBUG' % env['OPTIMIZATION'])

bindings/python/SConscript

@@ -30,7 +30,6 @@ install_prefix = env['DESTDIR'] + '/' + prefix
 
 linkflags = ''
 libraries = ['mapnik2','png','jpeg']
-headers = [env['PYTHON_INCLUDES']] + env['CPPPATH']
 
 if env['BOOST_PYTHON_LIB']:
     if os.path.sep in env['BOOST_PYTHON_LIB']:
@@ -141,9 +140,12 @@ env.Alias(target='install', source=ogcserver_module)
 sources = glob.glob('*.cpp')
 
 
+py_env = env.Clone()
+py_env.Append(CPPPATH = env['PYTHON_INCLUDES'])
+
 if env['SVN_REVISION']:
     sources.remove('mapnik_python.cpp')
-    env2 = env.Clone()
+    env2 = py_env.Clone()
     env2.Append(CCFLAGS='-DSVN_REVISION=%s' % env['SVN_REVISION'])
     if env['HAS_CAIRO'] or env['HAS_PYCAIRO']:
         if env['HAS_CAIRO']:
@@ -155,7 +157,7 @@ if env['SVN_REVISION']:
     sources.insert(0,env2.SharedObject('mapnik_python.cpp'))
 
 if env['HAS_CAIRO'] or env['HAS_PYCAIRO']:
-    env2 = env.Clone()
+    env2 = py_env.Clone()
     env2.ParseConfig('pkg-config --libs --cflags cairomm-1.0')
     fixup = ['mapnik_image.cpp','python_cairo.cpp']
     for cpp in fixup:
@@ -168,6 +170,8 @@ if env['HAS_CAIRO'] or env['HAS_PYCAIRO']:
     for cpp in fixup:
         sources.insert(0,env2.SharedObject(cpp))
 
-_mapnik = env.LoadableModule('mapnik/_mapnik2', sources, LIBS=libraries, LDMODULEPREFIX='', LDMODULESUFFIX='.so', CPPPATH=headers,LINKFLAGS=linkflags)
+
+_mapnik = py_env.LoadableModule('mapnik/_mapnik2', sources, LIBS=libraries, LDMODULEPREFIX='', LDMODULESUFFIX='.so',LINKFLAGS=linkflags)
+
 pymapniklib = env.Install(env['PYTHON_INSTALL_LOCATION'] + '/mapnik2',_mapnik)
-env.Alias(target='install',source=pymapniklib)
+py_env.Alias(target='install',source=pymapniklib)

src/SConscript

@@ -150,12 +150,11 @@ if True : # agg backend
 if env['HAS_CAIRO']:
     env2 = env.Clone()
     env2.Append(CXXFLAGS = '-DHAVE_CAIRO')
-    env2.ParseConfig('pkg-config --libs --cflags cairomm-1.0')
+    env2.ParseConfig('pkg-config --libs --cflags cairomm-1.0')     
     fixup = ['cairo_renderer.cpp','graphics.cpp','image_util.cpp']
     for cpp in fixup:
         if cpp in source:
             source.remove(cpp)
-    for cpp in fixup:
         source.insert(0,env2.SharedObject(cpp))
 
 if env['XMLPARSER'] == 'tinyxml':
@@ -166,11 +165,18 @@ if env['XMLPARSER'] == 'tinyxml':
         ../tinyxml/tinyxmlerror.cpp
         ../tinyxml/tinyxmlparser.cpp
         """)
-elif env['XMLPARSER'] == 'libxml2':
+elif env['XMLPARSER'] == 'libxml2' and env['HAS_LIBXML2']:
     source += Split(
         """
         libxml2_loader.cpp
         """)
+    env2 = env.Clone()
+    env2.Append(CXXFLAGS = '-DHAVE_LIBXML2')
+    fixup = ['load_map.cpp','libxml2_loader.cpp']
+    for cpp in fixup:
+        if cpp in source:
+            source.remove(cpp)
+        source.insert(0,env2.SharedObject(cpp))
 
 mapnik = env.SharedLibrary('mapnik2', source, LIBS=libraries, LINKFLAGS=linkflags)
 if env['PLATFORM'] != 'Darwin':

src/libxml2_loader.cpp

@@ -20,6 +20,8 @@
  *
  *****************************************************************************/
 
+#ifdef HAVE_LIBXML2
+
 #include <mapnik/libxml2_loader.hpp>
 
 #include <mapnik/config_error.hpp>
@@ -222,3 +224,5 @@ void read_xml2_string( std::string const & str, boost::property_tree::ptree & pt
 }
 
 } // end of namespace mapnik
+
+#endif

src/load_map.cpp

@@ -33,7 +33,9 @@
 #include <mapnik/font_set.hpp>
 
 #include <mapnik/ptree_helpers.hpp>
+#ifdef HAVE_LIBXML2
 #include <mapnik/libxml2_loader.hpp>
+#endif
 
 #include <mapnik/filter_factory.hpp>
 #include <mapnik/parse_path.hpp>