scons: fix boost_regex and sqlite_rtree config checks and be resilient to plugins that cannot be built due to the boost version

SConstruct

@@ -902,8 +902,7 @@ int main()
 
 def boost_regex_has_icu(context):
     if env['RUNTIME_LINK'] == 'static':
-        context.env.Append(LIBS='icui18n')
+        context.env.AppendUnique(LIBS='icudata')
-        context.env.Append(LIBS='icudata')
     ret = context.TryRun("""
 
 #include <boost/regex/icu.hpp>
@@ -1299,6 +1298,9 @@ if not preconfigured:
 
     if env['ICU_LIB_NAME'] not in env['MISSING_DEPS']:
         # http://lists.boost.org/Archives/boost/2009/03/150076.php
+        # we need libicui18n if using static boost libraries, so it is
+        # important to try this check with the library linked
+        env.AppendUnique(LIBS='icui18n')
         if conf.boost_regex_has_icu():
             # TODO - should avoid having this be globally defined...
             env.Append(CPPDEFINES = '-DBOOST_REGEX_HAS_ICU')
@@ -1307,7 +1309,7 @@ if not preconfigured:
 
     env['REQUESTED_PLUGINS'] = [ driver.strip() for driver in Split(env['INPUT_PLUGINS'])]
 
-    SQLITE_HAS_RTREE = conf.sqlite_has_rtree()
+    SQLITE_HAS_RTREE = None
     CHECK_PKG_CONFIG = conf.CheckPKGConfig('0.15.0')
 
     if len(env['REQUESTED_PLUGINS']):
@@ -1342,6 +1344,7 @@ if not preconfigured:
                     env.Replace(**backup)
                     env['SKIPPED_DEPS'].append(details['lib'])
                 if plugin == 'sqlite':
+                    SQLITE_HAS_RTREE = conf.sqlite_has_rtree()
                     sqlite_backup = env.Clone().Dictionary()
 
                     # if statically linking, on linux we likely
@@ -1358,6 +1361,8 @@ if not preconfigured:
                             except OSError,e:
                                 pass
 
+                    if SQLITE_HAS_RTREE is None:
+                        SQLITE_HAS_RTREE = conf.sqlite_has_rtree()
                     if not SQLITE_HAS_RTREE:
                         env.Replace(**sqlite_backup)
                         if details['lib'] in env['LIBS']:

plugins/input/csv/build.py

@@ -19,25 +19,36 @@
 #
 #
 
-Import ('plugin_base')
 Import ('env')
 
-PLUGIN_NAME = 'csv'
+can_build = False
 
-plugin_env = plugin_base.Clone()
+if env.get('BOOST_LIB_VERSION_FROM_HEADER'):
+    boost_version_from_header = int(env['BOOST_LIB_VERSION_FROM_HEADER'].split('_')[1])
+    if boost_version_from_header >= 47:
+        can_build = True
 
-plugin_sources = Split(
+if not can_build:
+    print 'WARNING: skipping building the optional geojson datasource plugin which requires boost >= 1.47'
+else:
+    Import ('plugin_base')
+
+    PLUGIN_NAME = 'csv'
+
+    plugin_env = plugin_base.Clone()
+
+    plugin_sources = Split(
       """
       %(PLUGIN_NAME)s_datasource.cpp
       """ % locals()
-)
+    )
 
-# Link Library to Dependencies
+    # Link Library to Dependencies
-libraries = []
+    libraries = []
-libraries.append('boost_system%s' % env['BOOST_APPEND'])
+    libraries.append('boost_system%s' % env['BOOST_APPEND'])
-libraries.append(env['ICU_LIB_NAME'])
+    libraries.append(env['ICU_LIB_NAME'])
 
-if env['PLUGIN_LINKING'] == 'shared':
+    if env['PLUGIN_LINKING'] == 'shared':
         libraries.append('mapnik')
 
         TARGET = plugin_env.SharedLibrary('../%s' % PLUGIN_NAME,
@@ -54,9 +65,9 @@ if env['PLUGIN_LINKING'] == 'shared':
             env.Install(env['MAPNIK_INPUT_PLUGINS_DEST'], TARGET)
             env.Alias('install', env['MAPNIK_INPUT_PLUGINS_DEST'])
 
-plugin_obj = {
+    plugin_obj = {
       'LIBS': libraries,
       'SOURCES': plugin_sources,
-}
+    }
 
-Return('plugin_obj')
+    Return('plugin_obj')

src/build.py

@@ -74,17 +74,17 @@ if env['TIFF']:
 if len(env['EXTRA_FREETYPE_LIBS']):
     lib_env['LIBS'].extend(copy(env['EXTRA_FREETYPE_LIBS']))
 
-# libxml2 should be optional but is currently not
-# https://github.com/mapnik/mapnik/issues/913
 lib_env['LIBS'].append('xml2')
 
 if env['THREADING'] == 'multi':
     lib_env['LIBS'].append('boost_thread%s' % env['BOOST_APPEND'])
 
+if '-DBOOST_REGEX_HAS_ICU' in env['CPPDEFINES']:
+    lib_env['LIBS'].append('icui18n')
+
 if env['RUNTIME_LINK'] == 'static':
     if 'icuuc' in env['ICU_LIB_NAME']:
         lib_env['LIBS'].append('icudata')
-        lib_env['LIBS'].append('icui18n')
 else:
     lib_env['LIBS'].insert(0, 'agg')
 
@@ -213,12 +213,15 @@ if env['PLUGIN_LINKING'] == 'static':
     for plugin in env['REQUESTED_PLUGINS']:
         details = env['PLUGINS'][plugin]
         if details['lib'] in env['LIBS'] or not details['lib']:
+            plugin_env = SConscript('../plugins/input/%s/build.py' % plugin)
+            if not plugin_env:
+                print("Notice: no 'plugin_env' variable found for plugin: '%s'" % plugin)
+            else:
                 hit = True
                 DEF = '-DMAPNIK_STATIC_PLUGIN_%s' % plugin.upper()
                 lib_env.Append(CPPDEFINES = DEF)
                 if DEF not in libmapnik_defines:
                     libmapnik_defines.append(DEF)
-            plugin_env = SConscript('../plugins/input/%s/build.py' % plugin)
                 if plugin_env.has_key('SOURCES') and plugin_env['SOURCES']:
                     source += ['../plugins/input/%s/%s' % (plugin, src) for src in plugin_env['SOURCES']]
                 if plugin_env.has_key('CPPDEFINES') and plugin_env['CPPDEFINES']: