Debian/Policy 3.9.x : enforce strict dependencies on dynamic modules

The recommendation is to use the link flag --no-undefined
and to fed *all* dependencies to the respective link step.

This changeset enables this strict linking of dependencies.
It turned out that our dependencies were already sane
(with the sole exception of a direct dependency to X-Lib
in the XV viewer widget)

admin/scons/Setup.py

@@ -77,6 +77,7 @@ def defineBuildEnvironment():
                , CXXFLAGS='-Wno-enum-compare'
                , CFLAGS='-std=gnu99' 
                )
+    env.Append(LINKFLAGS='-Wl,--no-undefined')  # require every dependency is given on link, in the right order
     handleVerboseMessages(env)
     handleNoBugSwitches(env)
     

src/SConscript

@@ -11,10 +11,10 @@ Import('env icons config')
 
 # define the source file/dirs comprising each artifact to be built.
 
-lLib  = env.SharedLibrary('lumierasupport', srcSubtree('lib'),     install=True)
-lApp  = env.SharedLibrary('lumieracommon',  srcSubtree('common'),  install=True)
-lBack = env.SharedLibrary('lumierabackend', srcSubtree('backend'), install=True)
-lProc = env.SharedLibrary('lumieraproc',    srcSubtree('proc'),    install=True)
+lLib  = env.SharedLibrary('lumierasupport', srcSubtree('lib'),                             install=True)
+lApp  = env.SharedLibrary('lumieracommon',  srcSubtree('common'), addLibs=lLib,            install=True)
+lBack = env.SharedLibrary('lumierabackend', srcSubtree('backend'),addLibs=lLib+lApp,       install=True)
+lProc = env.SharedLibrary('lumieraproc',    srcSubtree('proc'),   addLibs=lLib+lApp+lBack, install=True)
 
 core        = lProc+lBack+lApp+lLib    # in reverse dependency order
 support_lib = lLib
@@ -37,7 +37,7 @@ plugins = [] # currently none
 
 # the Lumiera GTK GUI
 envGtk = env.Clone()
-envGtk.mergeConf(['gtkmm-2.4','gthread-2.0','cairomm-1.0','gdl','xv','xext','sm'])
+envGtk.mergeConf(['gtkmm-2.4','gthread-2.0','cairomm-1.0','gdl','xv','x11','xext','sm'])
 envGtk.Append(LIBS=core)
 
 guimodule = envGtk.LumieraPlugin('gtk_gui', srcSubtree('gui'), install=True)

tests/SConscript

@@ -51,7 +51,7 @@ def testCases(env,dir):
     testlib = []
     testClasses = list(scanSubtree(dir,['*.cpp']))
     if testClasses:
-        testlib = sharedTestLibs[dir] = env.SharedLibrary('test-'+dir, testClasses)
+        testlib = sharedTestLibs[dir] = env.SharedLibrary('test-'+dir, testClasses, addLibs=core_lib)   ### TICKET #938 : should be:  addLibs=linkContext(dir))
     
     # pick up standalone plain-C tests
     standaloneTests = list(scanSubtree(dir,['test-*.c']))
@@ -74,7 +74,7 @@ testrunner = env.Program("test-suite", ["testrunner.cpp"]+testLibs+core_lib)
 
 testsuite = ( testcases
             + testrunner
-            + createPlugins(env, 'plugin')
+            + createPlugins(env, 'plugin', addLibs=core_lib)
             + env.File(glob('*.tests'))     # depend explicitly on the test definition files for test.sh
             + config
             )