Solution for #948 : special treatment for the test-suite

Note: this changeset globally sets the linkerflag --as-needed
but adds a single, hard coded exception to this rule for
taget/test-suite

admin/scons/Setup.py

@@ -78,6 +78,7 @@ def defineBuildEnvironment():
                , CFLAGS='-std=gnu99' 
                )
     env.Append(LINKFLAGS='-Wl,--no-undefined')  # require every dependency is given on link, in the right order
+    env.Append(LINKFLAGS='-Wl,--as-needed')     # by default only link against dependencies actually needed to resolve symbols 
     handleVerboseMessages(env)
     handleNoBugSwitches(env)
     

tests/SConscript

@@ -62,6 +62,13 @@ def testCases(env,dir):
 
 
 
+# Specific linker treatment for the testsuite:
+# force explicit linking against all dependencies to ensure auto-registration of
+# any test-class on startup, even if no code dependency is visible to the linker 
+envSuite = env.Clone()
+envSuite.Append(LINKFLAGS='-Wl,--no-as-needed') 
+
+
 # have to treat some subdirs separately.
 specialDirs = ['plugin','tool','include']
 testSrcDirs = globRootdirs('*')
@@ -69,7 +76,7 @@ testSrcDirs = globRootdirs('*')
 
 testcases  = [testCases(env, dir)  for dir in testSrcDirs if not dir in specialDirs]
 testLibs   = sharedTestLibs.values()
-testrunner = env.Program("test-suite", ["testrunner.cpp"]+testLibs+core_lib)
+testrunner = envSuite.Program("test-suite", ["testrunner.cpp"]+testLibs+core_lib)
 
 
 testsuite = ( testcases