Build all targets in a directory specific to the build configuration.

Invoke each subsidiary SConscript with a variant_dir argument.
Simplify the top-level .gitignore given the new build targets directory.

.gitignore

@@ -1,12 +1,7 @@
+targets/
 *.pyc
 *.bak
-*.o
-*.so
 *.swp
-*.linkinfo
 *.sconsign.dblite
 *.pgm
 *~
-nvcc_options_file.txt
-print_sm_version
-tester

SConstruct

@@ -334,11 +334,17 @@ env.Append(LIBPATH = lib_paths())
 
 env.Append(LIBS = libs(env.subst('$CXX'), env['host_backend'], env['device_backend']))
 
-# make the build environment available to SConscripts
-Export('env')
+# make the build environment available to all subsidiary SConscripts
+env.Export('env')
 
-SConscript('SConscript')
-SConscript('examples/SConscript')
-SConscript('testing/SConscript')
-SConscript('performance/SConscript')
+# assemble the name of this configuration's targets directory
+targets_dir = 'targets/{0}_host_{1}_device_{2}'.format(env['host_backend'], env['device_backend'], env['mode'])
+
+# invoke each SConscript with a variant directory
+env.SConscript('examples/SConscript',    variant_dir = 'examples/'    + targets_dir, duplicate = 0)
+env.SConscript('testing/SConscript',     variant_dir = 'testing/'     + targets_dir, duplicate = 0)
+env.SConscript('performance/SConscript', variant_dir = 'performance/' + targets_dir, duplicate = 0)
+
+# the top-level SConscript doesn't need a variant directory as it just builds zipfiles
+env.SConscript('SConscript')
 

performance/SConscript

@@ -1,6 +1,12 @@
-import os
+import sys
+
+# enable python to find the module
+module_path = Dir('#/performance').abspath
+sys.path.append(module_path)
 from build.perftest import compile_test
 
+import os
+
 Import('env')
 my_env = env.Clone()
 
@@ -19,7 +25,7 @@ report_builder = Builder(action = os.path.join('"' + str(my_env.Dir('.')), '$SOU
                          src_suffix = my_env['PROGSUFFIX'])
 my_env.Append(BUILDERS = {'Report' : report_builder})
 
-my_env.Append(CPPPATH = [Dir('.'), Dir('../testing/')])
+my_env.Append(CPPPATH = [Dir('#/performance'), Dir('#/testing')])
 
 cu_list = []
 program_list = []

testing/SConscript

@@ -19,7 +19,7 @@ if my_env.subst('$CXX') == 'cl':
   my_env.Append(CPPFLAGS = '/bigobj')
 
 # #include the current directory
-my_env.Append(CPPPATH = Dir('.'))
+my_env.Append(CPPPATH = Dir('#/testing'))
 
 # find all .cus & .cpps
 sources = []